mfd: Add max7360 support

Add core driver to support MAX7360 i2c chip, multi function device
with keypad, GPIO, PWM, GPO and rotary encoder submodules.

Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Co-developed-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20250824-mdb-max7360-support-v14-2-435cfda2b1ea@bootlin.com
Signed-off-by: Lee Jones <lee@kernel.org>

1 files changed, 109 insertions, 0 deletions

diff --git a/include/linux/mfd/max7360.h b/include/linux/mfd/max7360.h
new file mode 100644
index 000000000000..44cf2bf651a2
--- /dev/null
+++ b/include/linux/mfd/max7360.h
@@ -0,0 +1,109 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef __LINUX_MFD_MAX7360_H
+#define __LINUX_MFD_MAX7360_H
+
+#include <linux/bits.h>
+
+#define MAX7360_MAX_KEY_ROWS		8
+#define MAX7360_MAX_KEY_COLS		8
+#define MAX7360_MAX_KEY_NUM		(MAX7360_MAX_KEY_ROWS * MAX7360_MAX_KEY_COLS)
+#define MAX7360_ROW_SHIFT		3
+
+#define MAX7360_MAX_GPIO		8
+#define MAX7360_MAX_GPO			6
+#define MAX7360_PORT_PWM_COUNT		8
+#define MAX7360_PORT_RTR_PIN		(MAX7360_PORT_PWM_COUNT - 1)
+
+/*
+ * MAX7360 registers
+ */
+#define MAX7360_REG_KEYFIFO		0x00
+#define MAX7360_REG_CONFIG		0x01
+#define MAX7360_REG_DEBOUNCE		0x02
+#define MAX7360_REG_INTERRUPT		0x03
+#define MAX7360_REG_PORTS		0x04
+#define MAX7360_REG_KEYREP		0x05
+#define MAX7360_REG_SLEEP		0x06
+
+/*
+ * MAX7360 GPIO registers
+ *
+ * All these registers are reset together when writing bit 3 of
+ * MAX7360_REG_GPIOCFG.
+ */
+#define MAX7360_REG_GPIOCFG		0x40
+#define MAX7360_REG_GPIOCTRL		0x41
+#define MAX7360_REG_GPIODEB		0x42
+#define MAX7360_REG_GPIOCURR		0x43
+#define MAX7360_REG_GPIOOUTM		0x44
+#define MAX7360_REG_PWMCOM		0x45
+#define MAX7360_REG_RTRCFG		0x46
+#define MAX7360_REG_I2C_TIMEOUT		0x48
+#define MAX7360_REG_GPIOIN		0x49
+#define MAX7360_REG_RTR_CNT		0x4A
+#define MAX7360_REG_PWMBASE		0x50
+#define MAX7360_REG_PWMCFGBASE		0x58
+
+#define MAX7360_REG_GPIO_LAST		0x5F
+
+#define MAX7360_REG_PWM(x)		(MAX7360_REG_PWMBASE + (x))
+#define MAX7360_REG_PWMCFG(x)		(MAX7360_REG_PWMCFGBASE + (x))
+
+/*
+ * Configuration register bits
+ */
+#define MAX7360_FIFO_EMPTY		0x3F
+#define MAX7360_FIFO_OVERFLOW		0x7F
+#define MAX7360_FIFO_RELEASE		BIT(6)
+#define MAX7360_FIFO_COL		GENMASK(5, 3)
+#define MAX7360_FIFO_ROW		GENMASK(2, 0)
+
+#define MAX7360_CFG_SLEEP		BIT(7)
+#define MAX7360_CFG_INTERRUPT		BIT(5)
+#define MAX7360_CFG_KEY_RELEASE		BIT(3)
+#define MAX7360_CFG_WAKEUP		BIT(1)
+#define MAX7360_CFG_TIMEOUT		BIT(0)
+
+#define MAX7360_DEBOUNCE		GENMASK(4, 0)
+#define MAX7360_DEBOUNCE_MIN		9
+#define MAX7360_DEBOUNCE_MAX		40
+#define MAX7360_PORTS			GENMASK(8, 5)
+
+#define MAX7360_INTERRUPT_TIME_MASK	GENMASK(4, 0)
+#define MAX7360_INTERRUPT_FIFO_MASK	GENMASK(7, 5)
+
+#define MAX7360_PORT_CFG_INTERRUPT_MASK		BIT(7)
+#define MAX7360_PORT_CFG_INTERRUPT_EDGES	BIT(6)
+#define MAX7360_PORT_CFG_COMMON_PWM		BIT(5)
+
+/*
+ * Autosleep register values
+ */
+#define MAX7360_AUTOSLEEP_8192MS	0x01
+#define MAX7360_AUTOSLEEP_4096MS	0x02
+#define MAX7360_AUTOSLEEP_2048MS	0x03
+#define MAX7360_AUTOSLEEP_1024MS	0x04
+#define MAX7360_AUTOSLEEP_512MS		0x05
+#define MAX7360_AUTOSLEEP_256MS		0x06
+
+#define MAX7360_GPIO_CFG_RTR_EN		BIT(7)
+#define MAX7360_GPIO_CFG_GPIO_EN	BIT(4)
+#define MAX7360_GPIO_CFG_GPIO_RST	BIT(3)
+
+#define MAX7360_ROT_DEBOUNCE		GENMASK(3, 0)
+#define MAX7360_ROT_DEBOUNCE_MIN	0
+#define MAX7360_ROT_DEBOUNCE_MAX	15
+#define MAX7360_ROT_INTCNT		GENMASK(6, 4)
+#define MAX7360_ROT_INTCNT_DLY		BIT(7)
+
+#define MAX7360_INT_INTI		0
+#define MAX7360_INT_INTK		1
+
+#define MAX7360_INT_GPIO		0
+#define MAX7360_INT_KEYPAD		1
+#define MAX7360_INT_ROTARY		2
+
+#define MAX7360_NR_INTERNAL_IRQS	3
+
+#endif