pinctrl: Add pincontrol driver for ARTPEC-6 SoC

Add pinctrl driver support for the Axis ARTPEC-6 SoC.
There are only some pins that actually have different
functions available, but all can control bias (pull-up/-down)
and drive strength.

Code originally written by Chris Paterson.

Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

4 files changed, 1005 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index ed5731a8f5b8..1d5bc9757dc1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1088,6 +1088,7 @@ L:	linux-arm-kernel@axis.com
 F:	arch/arm/mach-artpec
 F:	arch/arm/boot/dts/artpec6*
 F:	drivers/clk/axis
+F:	drivers/pinctrl/pinctrl-artpec*
 F:	Documentation/devicetree/bindings/pinctrl/axis,artpec6-pinctrl.txt
 
 ARM/ASPEED MACHINE SUPPORT
diff --git a/drivers/pinctrl/Kconfig b/drivers/pinctrl/Kconfig
index 8f8c2af45781..37af5e3029d5 100644
--- a/drivers/pinctrl/Kconfig
+++ b/drivers/pinctrl/Kconfig
@@ -41,6 +41,17 @@ config PINCTRL_ADI2
 	  future processors. This option is selected automatically when specific
 	  machine and arch are selected to build.
 
+config PINCTRL_ARTPEC6
+        bool "Axis ARTPEC-6 pin controller driver"
+        depends on MACH_ARTPEC6
+        select PINMUX
+        select GENERIC_PINCONF
+        help
+          This is the driver for the Axis ARTPEC-6 pin controller. This driver
+          supports pin function multiplexing as well as pin bias and drive
+          strength configuration. Device tree integration instructions can be
+          found in Documentation/devicetree/bindings/pinctrl/axis,artpec6-pinctrl.txt
+
 config PINCTRL_AS3722
 	tristate "Pinctrl and GPIO driver for ams AS3722 PMIC"
 	depends on MFD_AS3722 && GPIOLIB
diff --git a/drivers/pinctrl/Makefile b/drivers/pinctrl/Makefile
index a251f439626f..5fc3c1ddd86f 100644
--- a/drivers/pinctrl/Makefile
+++ b/drivers/pinctrl/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_PINCONF)		+= pinconf.o
 obj-$(CONFIG_OF)		+= devicetree.o
 obj-$(CONFIG_GENERIC_PINCONF)	+= pinconf-generic.o
 obj-$(CONFIG_PINCTRL_ADI2)	+= pinctrl-adi2.o
+obj-$(CONFIG_PINCTRL_ARTPEC6)	+= pinctrl-artpec6.o
 obj-$(CONFIG_PINCTRL_AS3722)	+= pinctrl-as3722.o
 obj-$(CONFIG_PINCTRL_BF54x)	+= pinctrl-adi2-bf54x.o
 obj-$(CONFIG_PINCTRL_BF60x)	+= pinctrl-adi2-bf60x.o
diff --git a/drivers/pinctrl/pinctrl-artpec6.c b/drivers/pinctrl/pinctrl-artpec6.c
new file mode 100644
index 000000000000..b5a2eff7ae3d
--- /dev/null
+++ b/drivers/pinctrl/pinctrl-artpec6.c
@@ -0,0 +1,992 @@
+/*
+ * Driver for the Axis ARTPEC-6 pin controller
+ *
+ * Author: Chris Paterson <chris.paterson@linux.pieboy.co.uk>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/slab.h>
+#include "core.h"
+#include "pinconf.h"
+#include "pinctrl-utils.h"
+
+#define ARTPEC6_LAST_PIN	97	/* 97 pins in pinmux */
+#define ARTPEC6_MAX_MUXABLE	35	/* Last pin with muxable function */
+
+/* Pinmux control register bit definitions */
+#define ARTPEC6_PINMUX_UDC0_MASK	0x00000001
+#define ARTPEC6_PINMUX_UDC0_SHIFT	0
+#define ARTPEC6_PINMUX_UDC1_MASK	0x00000002
+#define ARTPEC6_PINMUX_UDC1_SHIFT	1
+#define ARTPEC6_PINMUX_DRV_MASK		0x00000060
+#define ARTPEC6_PINMUX_DRV_SHIFT	5
+#define ARTPEC6_PINMUX_SEL_MASK		0x00003000
+#define ARTPEC6_PINMUX_SEL_SHIFT	12
+
+/* Pinmux configurations */
+#define ARTPEC6_CONFIG_0		0
+#define ARTPEC6_CONFIG_1		1
+#define ARTPEC6_CONFIG_2		2
+#define ARTPEC6_CONFIG_3		3
+
+/* Pin drive strength options */
+#define ARTPEC6_DRIVE_4mA		4
+#define ARTPEC6_DRIVE_4mA_SET		0
+#define ARTPEC6_DRIVE_6mA		6
+#define ARTPEC6_DRIVE_6mA_SET		1
+#define ARTPEC6_DRIVE_8mA		8
+#define ARTPEC6_DRIVE_8mA_SET		2
+#define ARTPEC6_DRIVE_9mA		9
+#define ARTPEC6_DRIVE_9mA_SET		3
+
+struct artpec6_pmx {
+	struct device			*dev;
+	struct pinctrl_dev		*pctl;
+	void __iomem			*base;
+	struct pinctrl_pin_desc		*pins;
+	unsigned int			num_pins;
+	const struct artpec6_pin_group	*pin_groups;
+	unsigned int			num_pin_groups;
+	const struct artpec6_pmx_func	*functions;
+	unsigned int			num_functions;
+};
+
+struct artpec6_pin_group {
+	const char	   *name;
+	const unsigned int *pins;
+	const unsigned int num_pins;
+	unsigned char	   config;
+};
+
+struct artpec6_pmx_func {
+	const char	   *name;
+	const char * const *groups;
+	const unsigned int num_groups;
+};
+
+/* pins */
+static struct pinctrl_pin_desc artpec6_pins[] = {
+	PINCTRL_PIN(0, "GPIO0"),
+	PINCTRL_PIN(1, "GPIO1"),
+	PINCTRL_PIN(2, "GPIO2"),
+	PINCTRL_PIN(3, "GPIO3"),
+	PINCTRL_PIN(4, "GPIO4"),
+	PINCTRL_PIN(5, "GPIO5"),
+	PINCTRL_PIN(6, "GPIO6"),
+	PINCTRL_PIN(7, "GPIO7"),
+	PINCTRL_PIN(8, "GPIO8"),
+	PINCTRL_PIN(9, "GPIO9"),
+	PINCTRL_PIN(10, "GPIO10"),
+	PINCTRL_PIN(11, "GPIO11"),
+	PINCTRL_PIN(12, "GPIO12"),
+	PINCTRL_PIN(13, "GPIO13"),
+	PINCTRL_PIN(14, "GPIO14"),
+	PINCTRL_PIN(15, "GPIO15"),
+	PINCTRL_PIN(16, "GPIO16"),
+	PINCTRL_PIN(17, "GPIO17"),
+	PINCTRL_PIN(18, "GPIO18"),
+	PINCTRL_PIN(19, "GPIO19"),
+	PINCTRL_PIN(20, "GPIO20"),
+	PINCTRL_PIN(21, "GPIO21"),
+	PINCTRL_PIN(22, "GPIO22"),
+	PINCTRL_PIN(23, "GPIO23"),
+	PINCTRL_PIN(24, "GPIO24"),
+	PINCTRL_PIN(25, "GPIO25"),
+	PINCTRL_PIN(26, "GPIO26"),
+	PINCTRL_PIN(27, "GPIO27"),
+	PINCTRL_PIN(28, "GPIO28"),
+	PINCTRL_PIN(29, "GPIO29"),
+	PINCTRL_PIN(30, "GPIO30"),
+	PINCTRL_PIN(31, "GPIO31"),
+	PINCTRL_PIN(32, "UART3_TXD"),
+	PINCTRL_PIN(33, "UART3_RXD"),
+	PINCTRL_PIN(34, "UART3_RTS"),
+	PINCTRL_PIN(35, "UART3_CTS"),
+	PINCTRL_PIN(36, "NF_ALE"),
+	PINCTRL_PIN(37, "NF_CE0_N"),
+	PINCTRL_PIN(38, "NF_CE1_N"),
+	PINCTRL_PIN(39, "NF_CLE"),
+	PINCTRL_PIN(40, "NF_RE_N"),
+	PINCTRL_PIN(41, "NF_WE_N"),
+	PINCTRL_PIN(42, "NF_WP0_N"),
+	PINCTRL_PIN(43, "NF_WP1_N"),
+	PINCTRL_PIN(44, "NF_IO0"),
+	PINCTRL_PIN(45, "NF_IO1"),
+	PINCTRL_PIN(46, "NF_IO2"),
+	PINCTRL_PIN(47, "NF_IO3"),
+	PINCTRL_PIN(48, "NF_IO4"),
+	PINCTRL_PIN(49, "NF_IO5"),
+	PINCTRL_PIN(50, "NF_IO6"),
+	PINCTRL_PIN(51, "NF_IO7"),
+	PINCTRL_PIN(52, "NF_RB0_N"),
+	PINCTRL_PIN(53, "SDIO0_CLK"),
+	PINCTRL_PIN(54, "SDIO0_CMD"),
+	PINCTRL_PIN(55, "SDIO0_DAT0"),
+	PINCTRL_PIN(56, "SDIO0_DAT1"),
+	PINCTRL_PIN(57, "SDIO0_DAT2"),
+	PINCTRL_PIN(58, "SDIO0_DAT3"),
+	PINCTRL_PIN(59, "SDI0_CD"),
+	PINCTRL_PIN(60, "SDI0_WP"),
+	PINCTRL_PIN(61, "SDIO1_CLK"),
+	PINCTRL_PIN(62, "SDIO1_CMD"),
+	PINCTRL_PIN(63, "SDIO1_DAT0"),
+	PINCTRL_PIN(64, "SDIO1_DAT1"),
+	PINCTRL_PIN(65, "SDIO1_DAT2"),
+	PINCTRL_PIN(66, "SDIO1_DAT3"),
+	PINCTRL_PIN(67, "SDIO1_CD"),
+	PINCTRL_PIN(68, "SDIO1_WP"),
+	PINCTRL_PIN(69, "GBE_REFCLk"),
+	PINCTRL_PIN(70, "GBE_GTX_CLK"),
+	PINCTRL_PIN(71, "GBE_TX_CLK"),
+	PINCTRL_PIN(72, "GBE_TX_EN"),
+	PINCTRL_PIN(73, "GBE_TX_ER"),
+	PINCTRL_PIN(74, "GBE_TXD0"),
+	PINCTRL_PIN(75, "GBE_TXD1"),
+	PINCTRL_PIN(76, "GBE_TXD2"),
+	PINCTRL_PIN(77, "GBE_TXD3"),
+	PINCTRL_PIN(78, "GBE_TXD4"),
+	PINCTRL_PIN(79, "GBE_TXD5"),
+	PINCTRL_PIN(80, "GBE_TXD6"),
+	PINCTRL_PIN(81, "GBE_TXD7"),
+	PINCTRL_PIN(82, "GBE_RX_CLK"),
+	PINCTRL_PIN(83, "GBE_RX_DV"),
+	PINCTRL_PIN(84, "GBE_RX_ER"),
+	PINCTRL_PIN(85, "GBE_RXD0"),
+	PINCTRL_PIN(86, "GBE_RXD1"),
+	PINCTRL_PIN(87, "GBE_RXD2"),
+	PINCTRL_PIN(88, "GBE_RXD3"),
+	PINCTRL_PIN(89, "GBE_RXD4"),
+	PINCTRL_PIN(90, "GBE_RXD5"),
+	PINCTRL_PIN(91, "GBE_RXD6"),
+	PINCTRL_PIN(92, "GBE_RXD7"),
+	PINCTRL_PIN(93, "GBE_CRS"),
+	PINCTRL_PIN(94, "GBE_COL"),
+	PINCTRL_PIN(95, "GBE_MDC"),
+	PINCTRL_PIN(96, "GBE_MDIO"),
+};
+
+static const unsigned int cpuclkout_pins0[] = { 0 };
+static const unsigned int udlclkout_pins0[] = { 1 };
+static const unsigned int i2c1_pins0[] = { 2, 3 };
+static const unsigned int i2c2_pins0[] = { 4, 5 };
+static const unsigned int i2c3_pins0[] = { 6, 7 };
+static const unsigned int i2s0_pins0[] = { 8, 9, 10, 11 };
+static const unsigned int i2s1_pins0[] = { 12, 13, 14, 15 };
+static const unsigned int i2srefclk_pins0[] = { 19 };
+static const unsigned int spi0_pins0[] = { 12, 13, 14, 15 };
+static const unsigned int spi1_pins0[] = { 16, 17, 18, 19 };
+static const unsigned int pciedebug_pins0[] = { 12, 13, 14, 15 };
+static const unsigned int uart0_pins0[] = { 16, 17, 18, 19, 20,
+					    21, 22, 23, 24, 25 };
+static const unsigned int uart0_pins1[] = { 20, 21, 22, 23 };
+static const unsigned int uart1_pins0[] = { 24, 25, 26, 27 };
+static const unsigned int uart2_pins0[] = { 26, 27, 28, 29, 30,
+					    31, 32, 33, 34, 35 };
+static const unsigned int uart2_pins1[] = { 28, 29, 30, 31 };
+static const unsigned int uart3_pins0[] = { 32, 33, 34, 35 };
+static const unsigned int uart4_pins0[] = { 20, 21, 22, 23 };
+static const unsigned int uart5_pins0[] = { 28, 29, 30, 31 };
+static const unsigned int nand_pins0[]  = { 36, 37, 38, 39, 40, 41,
+					    42, 43, 44, 45, 46, 47,
+					    48, 49, 50, 51, 52 };
+static const unsigned int sdio0_pins0[] = { 53, 54, 55, 56, 57, 58, 59, 60 };
+static const unsigned int sdio1_pins0[] = { 61, 62, 63, 64, 65, 66, 67, 68 };
+static const unsigned int ethernet_pins0[]  = { 69, 70, 71, 72, 73, 74, 75,
+						76, 77, 78, 79, 80, 81, 82,
+						83, 84,	85, 86, 87, 88, 89,
+						90, 91, 92, 93, 94, 95, 96 };
+
+static const struct artpec6_pin_group artpec6_pin_groups[] = {
+	{
+		.name = "cpuclkoutgrp0",
+		.pins = cpuclkout_pins0,
+		.num_pins = ARRAY_SIZE(cpuclkout_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "udlclkoutgrp0",
+		.pins = udlclkout_pins0,
+		.num_pins = ARRAY_SIZE(udlclkout_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2c1grp0",
+		.pins = i2c1_pins0,
+		.num_pins = ARRAY_SIZE(i2c1_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2c2grp0",
+		.pins = i2c2_pins0,
+		.num_pins = ARRAY_SIZE(i2c2_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2c3grp0",
+		.pins = i2c3_pins0,
+		.num_pins = ARRAY_SIZE(i2c3_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2s0grp0",
+		.pins = i2s0_pins0,
+		.num_pins = ARRAY_SIZE(i2s0_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2s1grp0",
+		.pins = i2s1_pins0,
+		.num_pins = ARRAY_SIZE(i2s1_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "i2srefclkgrp0",
+		.pins = i2srefclk_pins0,
+		.num_pins = ARRAY_SIZE(i2srefclk_pins0),
+		.config = ARTPEC6_CONFIG_3,
+	},
+	{
+		.name = "spi0grp0",
+		.pins = spi0_pins0,
+		.num_pins = ARRAY_SIZE(spi0_pins0),
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "spi1grp0",
+		.pins = spi1_pins0,
+		.num_pins = ARRAY_SIZE(spi1_pins0),
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "pciedebuggrp0",
+		.pins = pciedebug_pins0,
+		.num_pins = ARRAY_SIZE(pciedebug_pins0),
+		.config = ARTPEC6_CONFIG_3,
+	},
+	{
+		.name = "uart0grp0",
+		.pins = uart0_pins0,
+		.num_pins = ARRAY_SIZE(uart0_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "uart0grp1",
+		.pins = uart0_pins1,
+		.num_pins = ARRAY_SIZE(uart0_pins1),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "uart1grp0",
+		.pins = uart1_pins0,
+		.num_pins = ARRAY_SIZE(uart1_pins0),
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "uart2grp0",
+		.pins = uart2_pins0,
+		.num_pins = ARRAY_SIZE(uart2_pins0),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "uart2grp1",
+		.pins = uart2_pins1,
+		.num_pins = ARRAY_SIZE(uart2_pins1),
+		.config = ARTPEC6_CONFIG_1,
+	},
+	{
+		.name = "uart3grp0",
+		.pins = uart3_pins0,
+		.num_pins = ARRAY_SIZE(uart3_pins0),
+		.config = ARTPEC6_CONFIG_0,
+	},
+	{
+		.name = "uart4grp0",
+		.pins = uart4_pins0,
+		.num_pins = ARRAY_SIZE(uart4_pins0),
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "uart5grp0",
+		.pins = uart5_pins0,
+		.num_pins = ARRAY_SIZE(uart5_pins0),
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "uart5nocts",
+		.pins = uart5_pins0,
+		.num_pins = ARRAY_SIZE(uart5_pins0) - 1,
+		.config = ARTPEC6_CONFIG_2,
+	},
+	{
+		.name = "nandgrp0",
+		.pins = nand_pins0,
+		.num_pins = ARRAY_SIZE(nand_pins0),
+		.config = ARTPEC6_CONFIG_0,
+	},
+	{
+		.name = "sdio0grp0",
+		.pins = sdio0_pins0,
+		.num_pins = ARRAY_SIZE(sdio0_pins0),
+		.config = ARTPEC6_CONFIG_0,
+	},
+	{
+		.name = "sdio1grp0",
+		.pins = sdio1_pins0,
+		.num_pins = ARRAY_SIZE(sdio1_pins0),
+		.config = ARTPEC6_CONFIG_0,
+	},
+	{
+		.name = "ethernetgrp0",
+		.pins = ethernet_pins0,
+		.num_pins = ARRAY_SIZE(ethernet_pins0),
+		.config = ARTPEC6_CONFIG_0,
+	},
+};
+
+struct pin_register {
+	unsigned int start;
+	unsigned int end;
+	unsigned int reg_base;
+};
+
+/*
+ * The register map has two holes where the pin number
+ * no longer fits directly with the register offset.
+ * This table allows us to map this easily.
+ */
+static const struct pin_register pin_register[] = {
+	{ 0, 35, 0x0 },		/* 0x0 - 0x8c */
+	{ 36, 52, 0x100 },	/* 0x100 - 0x140 */
+	{ 53, 96, 0x180 },	/* 0x180 - 0x22c */
+};
+
+static unsigned int artpec6_pmx_reg_offset(unsigned int pin)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(pin_register); i++) {
+		if (pin <= pin_register[i].end) {
+			return (pin - pin_register[i].start) * 4 +
+				pin_register[i].reg_base;
+		}
+	}
+	/*
+	 * Anything we return here is wrong, but we can only
+	 * get here if pin is outside registered range.
+	 */
+	pr_err("%s: Impossible pin %d\n", __func__, pin);
+	return 0;
+}
+
+static int artpec6_get_groups_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(artpec6_pin_groups);
+}
+
+static const char *artpec6_get_group_name(struct pinctrl_dev *pctldev,
+					  unsigned int group)
+{
+	return artpec6_pin_groups[group].name;
+}
+
+static int artpec6_get_group_pins(struct pinctrl_dev *pctldev,
+				  unsigned int group,
+				  const unsigned int **pins,
+				  unsigned int *num_pins)
+{
+	*pins = (unsigned int *)artpec6_pin_groups[group].pins;
+	*num_pins = artpec6_pin_groups[group].num_pins;
+	return 0;
+}
+
+static int artpec6_pconf_drive_mA_to_field(unsigned int mA)
+{
+	switch (mA) {
+	case ARTPEC6_DRIVE_4mA:
+		return ARTPEC6_DRIVE_4mA_SET;
+	case ARTPEC6_DRIVE_6mA:
+		return ARTPEC6_DRIVE_6mA_SET;
+	case ARTPEC6_DRIVE_8mA:
+		return ARTPEC6_DRIVE_8mA_SET;
+	case ARTPEC6_DRIVE_9mA:
+		return ARTPEC6_DRIVE_9mA_SET;
+	default:
+		return -EINVAL;
+	}
+}
+
+static unsigned int artpec6_pconf_drive_field_to_mA(int field)
+{
+	switch (field) {
+	case ARTPEC6_DRIVE_4mA_SET:
+		return ARTPEC6_DRIVE_4mA;
+	case ARTPEC6_DRIVE_6mA_SET:
+		return ARTPEC6_DRIVE_6mA;
+	case ARTPEC6_DRIVE_8mA_SET:
+		return ARTPEC6_DRIVE_8mA;
+	case ARTPEC6_DRIVE_9mA_SET:
+		return ARTPEC6_DRIVE_9mA;
+	default:
+		/* Shouldn't happen */
+		return 0;
+	}
+}
+
+static struct pinctrl_ops artpec6_pctrl_ops = {
+	.get_group_pins		= artpec6_get_group_pins,
+	.get_groups_count	= artpec6_get_groups_count,
+	.get_group_name		= artpec6_get_group_name,
+	.dt_node_to_map		= pinconf_generic_dt_node_to_map_all,
+	.dt_free_map		= pinctrl_utils_free_map,
+};
+
+static const char * const gpiogrps[] = {
+	"cpuclkoutgrp0", "udlclkoutgrp0", "i2c1grp0", "i2c2grp0",
+	"i2c3grp0", "i2s0grp0", "i2s1grp0", "i2srefclkgrp0",
+	"spi0grp0", "spi1grp0", "pciedebuggrp0", "uart0grp0",
+	"uart0grp1", "uart1grp0", "uart2grp0", "uart2grp1",
+	"uart4grp0", "uart5grp0",
+};
+static const char * const cpuclkoutgrps[] = { "cpuclkoutgrp0" };
+static const char * const udlclkoutgrps[] = { "udlclkoutgrp0" };
+static const char * const i2c1grps[]	  = { "i2c1grp0" };
+static const char * const i2c2grps[]	  = { "i2c2grp0" };
+static const char * const i2c3grps[]	  = { "i2c3grp0" };
+static const char * const i2s0grps[]	  = { "i2s0grp0" };
+static const char * const i2s1grps[]	  = { "i2s1grp0" };
+static const char * const i2srefclkgrps[] = { "i2srefclkgrp0" };
+static const char * const spi0grps[]	  = { "spi0grp0" };
+static const char * const spi1grps[]	  = { "spi1grp0" };
+static const char * const pciedebuggrps[] = { "pciedebuggrp0" };
+static const char * const uart0grps[]	  = { "uart0grp0", "uart0grp1" };
+static const char * const uart1grps[]	  = { "uart1grp0" };
+static const char * const uart2grps[]	  = { "uart2grp0", "uart2grp1" };
+static const char * const uart3grps[]	  = { "uart3grp0" };
+static const char * const uart4grps[]	  = { "uart4grp0" };
+static const char * const uart5grps[]	  = { "uart5grp0", "uart5nocts" };
+static const char * const nandgrps[]	  = { "nandgrp0" };
+static const char * const sdio0grps[]	  = { "sdio0grp0" };
+static const char * const sdio1grps[]	  = { "sdio1grp0" };
+static const char * const ethernetgrps[]  = { "ethernetgrp0" };
+
+static const struct artpec6_pmx_func artpec6_pmx_functions[] = {
+	{
+		.name = "gpio",
+		.groups = gpiogrps,
+		.num_groups = ARRAY_SIZE(gpiogrps),
+	},
+	{
+		.name = "cpuclkout",
+		.groups = cpuclkoutgrps,
+		.num_groups = ARRAY_SIZE(cpuclkoutgrps),
+	},
+	{
+		.name = "udlclkout",
+		.groups = udlclkoutgrps,
+		.num_groups = ARRAY_SIZE(udlclkoutgrps),
+	},
+	{
+		.name = "i2c1",
+		.groups = i2c1grps,
+		.num_groups = ARRAY_SIZE(i2c1grps),
+	},
+	{
+		.name = "i2c2",
+		.groups = i2c2grps,
+		.num_groups = ARRAY_SIZE(i2c2grps),
+	},
+	{
+		.name = "i2c3",
+		.groups = i2c3grps,
+		.num_groups = ARRAY_SIZE(i2c3grps),
+	},
+	{
+		.name = "i2s0",
+		.groups = i2s0grps,
+		.num_groups = ARRAY_SIZE(i2s0grps),
+	},
+	{
+		.name = "i2s1",
+		.groups = i2s1grps,
+		.num_groups = ARRAY_SIZE(i2s1grps),
+	},
+	{
+		.name = "i2srefclk",
+		.groups = i2srefclkgrps,
+		.num_groups = ARRAY_SIZE(i2srefclkgrps),
+	},
+	{
+		.name = "spi0",
+		.groups = spi0grps,
+		.num_groups = ARRAY_SIZE(spi0grps),
+	},
+	{
+		.name = "spi1",
+		.groups = spi1grps,
+		.num_groups = ARRAY_SIZE(spi1grps),
+	},
+	{
+		.name = "pciedebug",
+		.groups = pciedebuggrps,
+		.num_groups = ARRAY_SIZE(pciedebuggrps),
+	},
+	{
+		.name = "uart0",
+		.groups = uart0grps,
+		.num_groups = ARRAY_SIZE(uart0grps),
+	},
+	{
+		.name = "uart1",
+		.groups = uart1grps,
+		.num_groups = ARRAY_SIZE(uart1grps),
+	},
+	{
+		.name = "uart2",
+		.groups = uart2grps,
+		.num_groups = ARRAY_SIZE(uart2grps),
+	},
+	{
+		.name = "uart3",
+		.groups = uart3grps,
+		.num_groups = ARRAY_SIZE(uart3grps),
+	},
+	{
+		.name = "uart4",
+		.groups = uart4grps,
+		.num_groups = ARRAY_SIZE(uart4grps),
+	},
+	{
+		.name = "uart5",
+		.groups = uart5grps,
+		.num_groups = ARRAY_SIZE(uart5grps),
+	},
+	{
+		.name = "nand",
+		.groups = nandgrps,
+		.num_groups = ARRAY_SIZE(nandgrps),
+	},
+	{
+		.name = "sdio0",
+		.groups = sdio0grps,
+		.num_groups = ARRAY_SIZE(sdio0grps),
+	},
+	{
+		.name = "sdio1",
+		.groups = sdio1grps,
+		.num_groups = ARRAY_SIZE(sdio1grps),
+	},
+	{
+		.name = "ethernet",
+		.groups = ethernetgrps,
+		.num_groups = ARRAY_SIZE(ethernetgrps),
+	},
+};
+
+static int artpec6_pmx_get_functions_count(struct pinctrl_dev *pctldev)
+{
+	return ARRAY_SIZE(artpec6_pmx_functions);
+}
+
+static const char *artpec6_pmx_get_fname(struct pinctrl_dev *pctldev,
+				  unsigned int function)
+{
+	return artpec6_pmx_functions[function].name;
+}
+
+static int artpec6_pmx_get_fgroups(struct pinctrl_dev *pctldev,
+				   unsigned int function,
+				   const char * const **groups,
+				   unsigned int * const num_groups)
+{
+	*groups = artpec6_pmx_functions[function].groups;
+	*num_groups = artpec6_pmx_functions[function].num_groups;
+	return 0;
+}
+
+static void artpec6_pmx_select_func(struct pinctrl_dev *pctldev,
+				    unsigned int function, unsigned int group,
+				    bool enable)
+{
+	unsigned int regval, val;
+	unsigned int reg;
+	int i;
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	for (i = 0; i < artpec6_pin_groups[group].num_pins; i++) {
+		/*
+		 * Registers for pins above a ARTPEC6_MAX_MUXABLE
+		 * do not have a SEL field and are always selected.
+		 */
+		if (artpec6_pin_groups[group].pins[i] > ARTPEC6_MAX_MUXABLE)
+			continue;
+
+		if (!strcmp(artpec6_pmx_get_fname(pctldev, function), "gpio")) {
+			/* GPIO is always config 0 */
+			val = ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
+		} else {
+			if (enable)
+				val = artpec6_pin_groups[group].config
+					<< ARTPEC6_PINMUX_SEL_SHIFT;
+			else
+				val = ARTPEC6_CONFIG_0
+					<< ARTPEC6_PINMUX_SEL_SHIFT;
+		}
+
+		reg = artpec6_pmx_reg_offset(artpec6_pin_groups[group].pins[i]);
+
+		regval = readl(pmx->base + reg);
+		regval &= ~ARTPEC6_PINMUX_SEL_MASK;
+		regval |= val;
+		writel(regval, pmx->base + reg);
+	}
+}
+
+int artpec6_pmx_enable(struct pinctrl_dev *pctldev, unsigned int function,
+		       unsigned int group)
+{
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	dev_dbg(pmx->dev, "enabling %s function for pin group %s\n",
+		artpec6_pmx_get_fname(pctldev, function),
+		artpec6_get_group_name(pctldev, group));
+
+	artpec6_pmx_select_func(pctldev, function, group, true);
+
+	return 0;
+}
+
+void artpec6_pmx_disable(struct pinctrl_dev *pctldev, unsigned int function,
+			 unsigned int group)
+{
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+
+	dev_dbg(pmx->dev, "disabling %s function for pin group %s\n",
+		artpec6_pmx_get_fname(pctldev, function),
+		artpec6_get_group_name(pctldev, group));
+
+	artpec6_pmx_select_func(pctldev, function, group, false);
+}
+
+static int artpec6_pmx_request_gpio(struct pinctrl_dev *pctldev,
+				    struct pinctrl_gpio_range *range,
+				    unsigned int pin)
+{
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+	unsigned int reg = artpec6_pmx_reg_offset(pin);
+	u32 val;
+
+	if (pin >= 32)
+		return -EINVAL;
+
+	val = readl_relaxed(pmx->base + reg);
+	val &= ~ARTPEC6_PINMUX_SEL_MASK;
+	val |= ARTPEC6_CONFIG_0 << ARTPEC6_PINMUX_SEL_SHIFT;
+	writel_relaxed(val, pmx->base + reg);
+
+	return 0;
+}
+
+static const struct pinmux_ops artpec6_pmx_ops = {
+	.get_functions_count	= artpec6_pmx_get_functions_count,
+	.get_function_name	= artpec6_pmx_get_fname,
+	.get_function_groups	= artpec6_pmx_get_fgroups,
+	.set_mux		= artpec6_pmx_enable,
+	.gpio_request_enable = artpec6_pmx_request_gpio,
+};
+
+static int artpec6_pconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
+			     unsigned long *config)
+{
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param = pinconf_to_config_param(*config);
+	unsigned int regval;
+
+	/* Check for valid pin */
+	if (pin >= pmx->num_pins) {
+		dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
+			pmx->pins[pin].name);
+		return -ENOTSUPP;
+	}
+
+	dev_dbg(pmx->dev, "getting configuration for pin %s\n",
+		pmx->pins[pin].name);
+
+	/* Read pin register values */
+	regval = readl(pmx->base + artpec6_pmx_reg_offset(pin));
+
+	/* If valid, get configuration for parameter */
+	switch (param) {
+	case PIN_CONFIG_BIAS_DISABLE:
+		if (!(regval & ARTPEC6_PINMUX_UDC1_MASK))
+			return -EINVAL;
+		break;
+
+	case PIN_CONFIG_BIAS_PULL_UP:
+	case PIN_CONFIG_BIAS_PULL_DOWN:
+		if (regval & ARTPEC6_PINMUX_UDC1_MASK)
+			return -EINVAL;
+
+		regval = regval & ARTPEC6_PINMUX_UDC0_MASK;
+		if ((param == PIN_CONFIG_BIAS_PULL_UP && !regval) ||
+		    (param == PIN_CONFIG_BIAS_PULL_DOWN && regval))
+			return -EINVAL;
+		break;
+	case PIN_CONFIG_DRIVE_STRENGTH:
+		regval = (regval & ARTPEC6_PINMUX_DRV_MASK)
+			>> ARTPEC6_PINMUX_DRV_SHIFT;
+		regval = artpec6_pconf_drive_field_to_mA(regval);
+		*config = pinconf_to_config_packed(param, regval);
+		break;
+	default:
+		return -ENOTSUPP;
+	}
+
+	return 0;
+}
+
+/*
+ * Valid combinations of param and arg:
+ *
+ * param		     arg
+ * PIN_CONFIG_BIAS_DISABLE:   x (disable bias)
+ * PIN_CONFIG_BIAS_PULL_UP:   1 (pull up bias + enable)
+ * PIN_CONFIG_BIAS_PULL_DOWN: 1 (pull down bias + enable)
+ * PIN_CONFIG_DRIVE_STRENGTH: x (4mA, 6mA, 8mA, 9mA)
+ *
+ * All other args are invalid. All other params are not supported.
+ */
+static int artpec6_pconf_set(struct pinctrl_dev *pctldev, unsigned int pin,
+			     unsigned long *configs, unsigned int num_configs)
+{
+	struct artpec6_pmx *pmx = pinctrl_dev_get_drvdata(pctldev);
+	enum pin_config_param param;
+	unsigned int arg;
+	unsigned int regval;
+	unsigned int *reg;
+	int i;
+
+	/* Check for valid pin */
+	if (pin >= pmx->num_pins) {
+		dev_dbg(pmx->dev, "pinconf is not supported for pin %s\n",
+			pmx->pins[pin].name);
+		return -ENOTSUPP;
+	}
+
+	dev_dbg(pmx->dev, "setting configuration for pin %s\n",
+		pmx->pins[pin].name);
+
+	reg = pmx->base + artpec6_pmx_reg_offset(pin);
+
+	/* For each config */
+	for (i = 0; i < num_configs; i++) {
+		int drive;
+
+		param = pinconf_to_config_param(configs[i]);
+		arg = pinconf_to_config_argument(configs[i]);
+
+		switch (param) {
+		case PIN_CONFIG_BIAS_DISABLE:
+			regval = readl(reg);
+			regval |= (1 << ARTPEC6_PINMUX_UDC1_SHIFT);
+			writel(regval, reg);
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_UP:
+			if (arg != 1) {
+				dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
+					__func__, arg);
+				return -EINVAL;
+			}
+
+			regval = readl(reg);
+			regval |= (arg << ARTPEC6_PINMUX_UDC0_SHIFT);
+			regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
+			writel(regval, reg);
+			break;
+
+		case PIN_CONFIG_BIAS_PULL_DOWN:
+			if (arg != 1) {
+				dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
+					__func__, arg);
+				return -EINVAL;
+			}
+
+			regval = readl(reg);
+			regval &= ~(arg << ARTPEC6_PINMUX_UDC0_SHIFT);
+			regval &= ~ARTPEC6_PINMUX_UDC1_MASK; /* Enable */
+			writel(regval, reg);
+			break;
+
+		case PIN_CONFIG_DRIVE_STRENGTH:
+			drive = artpec6_pconf_drive_mA_to_field(arg);
+			if (drive < 0) {
+				dev_dbg(pctldev->dev, "%s: arg %u out of range\n",
+					__func__, arg);
+				return -EINVAL;
+			}
+
+			regval = readl(reg);
+			regval &= ~ARTPEC6_PINMUX_DRV_MASK;
+			regval |= (drive << ARTPEC6_PINMUX_DRV_SHIFT);
+			writel(regval, reg);
+			break;
+
+		default:
+			dev_dbg(pmx->dev, "parameter not supported\n");
+			return -ENOTSUPP;
+		}
+	}
+
+	return 0;
+}
+
+static int artpec6_pconf_group_set(struct pinctrl_dev *pctldev,
+				   unsigned int group, unsigned long *configs,
+				   unsigned int num_configs)
+{
+	unsigned int num_pins, current_pin;
+	int ret;
+
+	dev_dbg(pctldev->dev, "setting group %s configuration\n",
+		artpec6_get_group_name(pctldev, group));
+
+	num_pins = artpec6_pin_groups[group].num_pins;
+
+	for (current_pin = 0; current_pin < num_pins; current_pin++) {
+		ret = artpec6_pconf_set(pctldev,
+				artpec6_pin_groups[group].pins[current_pin],
+				configs, num_configs);
+
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static const struct pinconf_ops artpec6_pconf_ops = {
+	.is_generic		= true,
+	.pin_config_get		= artpec6_pconf_get,
+	.pin_config_set		= artpec6_pconf_set,
+	.pin_config_group_set	= artpec6_pconf_group_set,
+};
+
+static struct pinctrl_desc artpec6_desc = {
+	.name	 = "artpec6-pinctrl",
+	.owner	 = THIS_MODULE,
+	.pins	 = artpec6_pins,
+	.npins	 = ARRAY_SIZE(artpec6_pins),
+	.pctlops = &artpec6_pctrl_ops,
+	.pmxops	 = &artpec6_pmx_ops,
+	.confops = &artpec6_pconf_ops,
+};
+
+/* The reset values say 4mA, but we want 8mA as default. */
+static void artpec6_pmx_reset(struct artpec6_pmx *pmx)
+{
+	void __iomem *base = pmx->base;
+	int i;
+
+	for (i = 0; i < ARTPEC6_LAST_PIN; i++) {
+		u32 val;
+
+		val = readl_relaxed(base + artpec6_pmx_reg_offset(i));
+		val &= ~ARTPEC6_PINMUX_DRV_MASK;
+		val |= ARTPEC6_DRIVE_8mA_SET << ARTPEC6_PINMUX_DRV_SHIFT;
+		writel_relaxed(val, base + artpec6_pmx_reg_offset(i));
+	}
+}
+
+static int artpec6_pmx_probe(struct platform_device *pdev)
+{
+	struct artpec6_pmx *pmx;
+	struct resource *res;
+
+	pmx = devm_kzalloc(&pdev->dev, sizeof(*pmx), GFP_KERNEL);
+	if (!pmx)
+		return -ENOMEM;
+
+	pmx->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pmx->base = devm_ioremap_resource(&pdev->dev, res);
+
+	if (IS_ERR(pmx->base))
+		return PTR_ERR(pmx->base);
+
+	artpec6_pmx_reset(pmx);
+
+	pmx->pins	    = artpec6_pins;
+	pmx->num_pins	    = ARRAY_SIZE(artpec6_pins);
+	pmx->functions	    = artpec6_pmx_functions;
+	pmx->num_functions  = ARRAY_SIZE(artpec6_pmx_functions);
+	pmx->pin_groups	    = artpec6_pin_groups;
+	pmx->num_pin_groups = ARRAY_SIZE(artpec6_pin_groups);
+	pmx->pctl	    = pinctrl_register(&artpec6_desc, &pdev->dev, pmx);
+
+	if (!pmx->pctl) {
+		dev_err(&pdev->dev, "could not register pinctrl driver\n");
+		return -EINVAL;
+	}
+
+	platform_set_drvdata(pdev, pmx);
+
+	dev_info(&pdev->dev, "initialised Axis ARTPEC-6 pinctrl driver\n");
+
+	return 0;
+}
+
+static int artpec6_pmx_remove(struct platform_device *pdev)
+{
+	struct artpec6_pmx *pmx = platform_get_drvdata(pdev);
+
+	pinctrl_unregister(pmx->pctl);
+
+	return 0;
+}
+
+static const struct of_device_id artpec6_pinctrl_match[] = {
+	{ .compatible = "axis,artpec6-pinctrl" },
+	{},
+};
+
+static struct platform_driver artpec6_pmx_driver = {
+	.driver = {
+		.name = "artpec6-pinctrl",
+		.owner = THIS_MODULE,
+		.of_match_table = artpec6_pinctrl_match,
+	},
+	.probe = artpec6_pmx_probe,
+	.remove = artpec6_pmx_remove,
+};
+
+static int __init artpec6_pmx_init(void)
+{
+	return platform_driver_register(&artpec6_pmx_driver);
+}
+arch_initcall(artpec6_pmx_init);
+
+static void __exit artpec6_pmx_exit(void)
+{
+	platform_driver_unregister(&artpec6_pmx_driver);
+}
+module_exit(artpec6_pmx_exit);
+
+MODULE_AUTHOR("Chris Paterson <chris.paterson@linux.pieboy.co.uk>");
+MODULE_DESCRIPTION("Axis ARTPEC-6 pin control driver");
+MODULE_LICENSE("GPL v2");
+MODULE_DEVICE_TABLE(of, artpec6_pinctrl_match);