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authorMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>2018-08-03 14:08:14 +0300
committerLee Jones <lee.jones@linaro.org>2018-08-16 12:13:37 +0300
commit30107fa6908b6c2747ee9100b40af813f99483c3 (patch)
tree325d74408a631a3dfa5098bd8ca8744d39ffbb0b /drivers/mfd
parentf863ae594d33e57aa12cdde47e767e6e7942ee51 (diff)
downloadlinux-30107fa6908b6c2747ee9100b40af813f99483c3.tar.xz
mfd: bd71837: Core driver for ROHM BD71837 PMIC
ROHM BD71837 PMIC MFD driver providing interrupts and support for three subsystems: - clk - Regulators - input/power-key Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/Kconfig13
-rw-r--r--drivers/mfd/Makefile1
-rw-r--r--drivers/mfd/rohm-bd718x7.c211
3 files changed, 225 insertions, 0 deletions
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index f3fa516011ec..11841f4b7b2b 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1817,6 +1817,19 @@ config MFD_STW481X
in various ST Microelectronics and ST-Ericsson embedded
Nomadik series.
+config MFD_ROHM_BD718XX
+ tristate "ROHM BD71837 Power Management IC"
+ depends on I2C=y
+ depends on OF
+ select REGMAP_I2C
+ select REGMAP_IRQ
+ select MFD_CORE
+ help
+ Select this option to get support for the ROHM BD71837
+ Power Management ICs. BD71837 is designed to power processors like
+ NXP i.MX8. It contains 8 BUCK outputs and 7 LDOs, voltage monitoring
+ and emergency shut down as well as 32,768KHz clock output.
+
config MFD_STM32_LPTIMER
tristate "Support for STM32 Low-Power Timer"
depends on (ARCH_STM32 && OF) || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 2852a6042ecf..5856a9489cbd 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -239,4 +239,5 @@ obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o
+obj-$(CONFIG_MFD_ROHM_BD718XX) += rohm-bd718x7.o
diff --git a/drivers/mfd/rohm-bd718x7.c b/drivers/mfd/rohm-bd718x7.c
new file mode 100644
index 000000000000..75c8ec659547
--- /dev/null
+++ b/drivers/mfd/rohm-bd718x7.c
@@ -0,0 +1,211 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+//
+// Copyright (C) 2018 ROHM Semiconductors
+//
+// ROHM BD71837MWV PMIC driver
+//
+// Datasheet available from
+// https://www.rohm.com/datasheet/BD71837MWV/bd71837mwv-e
+
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/interrupt.h>
+#include <linux/mfd/rohm-bd718x7.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+/*
+ * gpio_keys.h requires definiton of bool. It is brought in
+ * by above includes. Keep this as last until gpio_keys.h gets fixed.
+ */
+#include <linux/gpio_keys.h>
+
+static const u8 supported_revisions[] = { 0xA2 /* BD71837 */ };
+
+static struct gpio_keys_button button = {
+ .code = KEY_POWER,
+ .gpio = -1,
+ .type = EV_KEY,
+};
+
+static struct gpio_keys_platform_data bd718xx_powerkey_data = {
+ .buttons = &button,
+ .nbuttons = 1,
+ .name = "bd718xx-pwrkey",
+};
+
+static struct mfd_cell bd71837_mfd_cells[] = {
+ {
+ .name = "gpio-keys",
+ .platform_data = &bd718xx_powerkey_data,
+ .pdata_size = sizeof(bd718xx_powerkey_data),
+ },
+ { .name = "bd71837-clk", },
+ { .name = "bd71837-pmic", },
+};
+
+static const struct regmap_irq bd71837_irqs[] = {
+ REGMAP_IRQ_REG(BD71837_INT_SWRST, 0, BD71837_INT_SWRST_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_PWRBTN_S, 0, BD71837_INT_PWRBTN_S_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_PWRBTN_L, 0, BD71837_INT_PWRBTN_L_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_PWRBTN, 0, BD71837_INT_PWRBTN_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_WDOG, 0, BD71837_INT_WDOG_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_ON_REQ, 0, BD71837_INT_ON_REQ_MASK),
+ REGMAP_IRQ_REG(BD71837_INT_STBY_REQ, 0, BD71837_INT_STBY_REQ_MASK),
+};
+
+static struct regmap_irq_chip bd71837_irq_chip = {
+ .name = "bd71837-irq",
+ .irqs = bd71837_irqs,
+ .num_irqs = ARRAY_SIZE(bd71837_irqs),
+ .num_regs = 1,
+ .irq_reg_stride = 1,
+ .status_base = BD71837_REG_IRQ,
+ .mask_base = BD71837_REG_MIRQ,
+ .ack_base = BD71837_REG_IRQ,
+ .init_ack_masked = true,
+ .mask_invert = false,
+};
+
+static const struct regmap_range pmic_status_range = {
+ .range_min = BD71837_REG_IRQ,
+ .range_max = BD71837_REG_POW_STATE,
+};
+
+static const struct regmap_access_table volatile_regs = {
+ .yes_ranges = &pmic_status_range,
+ .n_yes_ranges = 1,
+};
+
+static const struct regmap_config bd71837_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &volatile_regs,
+ .max_register = BD71837_MAX_REGISTER - 1,
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int bd71837_i2c_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct bd71837 *bd71837;
+ int ret, i;
+ unsigned int val;
+
+ bd71837 = devm_kzalloc(&i2c->dev, sizeof(struct bd71837), GFP_KERNEL);
+
+ if (!bd71837)
+ return -ENOMEM;
+
+ bd71837->chip_irq = i2c->irq;
+
+ if (!bd71837->chip_irq) {
+ dev_err(&i2c->dev, "No IRQ configured\n");
+ return -EINVAL;
+ }
+
+ bd71837->dev = &i2c->dev;
+ dev_set_drvdata(&i2c->dev, bd71837);
+
+ bd71837->regmap = devm_regmap_init_i2c(i2c, &bd71837_regmap_config);
+ if (IS_ERR(bd71837->regmap)) {
+ dev_err(&i2c->dev, "regmap initialization failed\n");
+ return PTR_ERR(bd71837->regmap);
+ }
+
+ ret = regmap_read(bd71837->regmap, BD71837_REG_REV, &val);
+ if (ret) {
+ dev_err(&i2c->dev, "Read BD71837_REG_DEVICE failed\n");
+ return ret;
+ }
+ for (i = 0; i < ARRAY_SIZE(supported_revisions); i++)
+ if (supported_revisions[i] == val)
+ break;
+
+ if (i == ARRAY_SIZE(supported_revisions)) {
+ dev_err(&i2c->dev, "Unsupported chip revision\n");
+ return -ENODEV;
+ }
+
+ ret = devm_regmap_add_irq_chip(&i2c->dev, bd71837->regmap,
+ bd71837->chip_irq, IRQF_ONESHOT, 0,
+ &bd71837_irq_chip, &bd71837->irq_data);
+ if (ret) {
+ dev_err(&i2c->dev, "Failed to add irq_chip\n");
+ return ret;
+ }
+
+ /* Configure short press to 10 milliseconds */
+ ret = regmap_update_bits(bd71837->regmap,
+ BD71837_REG_PWRONCONFIG0,
+ BD718XX_PWRBTN_PRESS_DURATION_MASK,
+ BD718XX_PWRBTN_SHORT_PRESS_10MS);
+ if (ret) {
+ dev_err(&i2c->dev,
+ "Failed to configure button short press timeout\n");
+ return ret;
+ }
+
+ /* Configure long press to 10 seconds */
+ ret = regmap_update_bits(bd71837->regmap,
+ BD71837_REG_PWRONCONFIG1,
+ BD718XX_PWRBTN_PRESS_DURATION_MASK,
+ BD718XX_PWRBTN_LONG_PRESS_10S);
+
+ if (ret) {
+ dev_err(&i2c->dev,
+ "Failed to configure button long press timeout\n");
+ return ret;
+ }
+
+ ret = regmap_irq_get_virq(bd71837->irq_data, BD71837_INT_PWRBTN_S);
+
+ if (ret < 0) {
+ dev_err(&i2c->dev, "Failed to get the IRQ\n");
+ return ret;
+ }
+
+ button.irq = ret;
+
+ ret = devm_mfd_add_devices(bd71837->dev, PLATFORM_DEVID_AUTO,
+ bd71837_mfd_cells,
+ ARRAY_SIZE(bd71837_mfd_cells), NULL, 0,
+ regmap_irq_get_domain(bd71837->irq_data));
+ if (ret)
+ dev_err(&i2c->dev, "Failed to create subdevices\n");
+
+ return ret;
+}
+
+static const struct of_device_id bd71837_of_match[] = {
+ { .compatible = "rohm,bd71837", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, bd71837_of_match);
+
+static struct i2c_driver bd71837_i2c_driver = {
+ .driver = {
+ .name = "rohm-bd718x7",
+ .of_match_table = bd71837_of_match,
+ },
+ .probe = bd71837_i2c_probe,
+};
+
+static int __init bd71837_i2c_init(void)
+{
+ return i2c_add_driver(&bd71837_i2c_driver);
+}
+
+/* Initialise early so consumer devices can complete system boot */
+subsys_initcall(bd71837_i2c_init);
+
+static void __exit bd71837_i2c_exit(void)
+{
+ i2c_del_driver(&bd71837_i2c_driver);
+}
+module_exit(bd71837_i2c_exit);
+
+MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>");
+MODULE_DESCRIPTION("ROHM BD71837 Power Management IC driver");
+MODULE_LICENSE("GPL");