[PATCH 2/2] gpio: bd71815: Use gpio-regmap

From: Matti Vaittinen
Date: Thu May 20 2021 - 07:50:22 EST

Utilize the gpio-regmap helper and drop the custom functions

Signed-off-by: Matti Vaittinen <matti.vaittinen@xxxxxxxxxxxxxxxxx>
---
drivers/gpio/Kconfig | 1 +
drivers/gpio/gpio-bd71815.c | 106 ++++++++++--------------------------
2 files changed, 29 insertions(+), 78 deletions(-)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 1dd0ec6727fd..97e1348cd410 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1120,6 +1120,7 @@ config GPIO_BD70528
config GPIO_BD71815
tristate "ROHM BD71815 PMIC GPIO support"
depends on MFD_ROHM_BD71828
+ select GPIO_REGMAP
help
Support for GPO(s) on ROHM BD71815 PMIC. There are two GPOs
available on the ROHM PMIC.
diff --git a/drivers/gpio/gpio-bd71815.c b/drivers/gpio/gpio-bd71815.c
index 08ff2857256f..a241c01e08d1 100644
--- a/drivers/gpio/gpio-bd71815.c
+++ b/drivers/gpio/gpio-bd71815.c
@@ -9,6 +9,7 @@
*/

#include <linux/gpio/driver.h>
+#include <linux/gpio/regmap.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/module.h>
@@ -18,81 +19,33 @@
#include <linux/mfd/rohm-bd71815.h>

struct bd71815_gpio {
- /* chip.parent points the MFD which provides DT node and regmap */
- struct gpio_chip chip;
- /* dev points to the platform device for devm and prints */
struct device *dev;
- struct regmap *regmap;
};

-static int bd71815gpo_get(struct gpio_chip *chip, unsigned int offset)
-{
- struct bd71815_gpio *bd71815 = gpiochip_get_data(chip);
- int ret, val;
-
- ret = regmap_read(bd71815->regmap, BD71815_REG_GPO, &val);
- if (ret)
- return ret;
-
- return (val >> offset) & 1;
-}
-
-static void bd71815gpo_set(struct gpio_chip *chip, unsigned int offset,
- int value)
-{
- struct bd71815_gpio *bd71815 = gpiochip_get_data(chip);
- int ret, bit;
-
- bit = BIT(offset);
-
- if (value)
- ret = regmap_set_bits(bd71815->regmap, BD71815_REG_GPO, bit);
- else
- ret = regmap_clear_bits(bd71815->regmap, BD71815_REG_GPO, bit);
-
- if (ret)
- dev_warn(bd71815->dev, "failed to toggle GPO\n");
-}
-
-static int bd71815_gpio_set_config(struct gpio_chip *chip, unsigned int offset,
+static int bd71815_gpio_set_config(struct regmap *regmap, void *drvdata,
+ unsigned int offset,
unsigned long config)
{
- struct bd71815_gpio *bdgpio = gpiochip_get_data(chip);
+ struct bd71815_gpio *bdgpio = (struct bd71815_gpio *)drvdata;

switch (pinconf_to_config_param(config)) {
case PIN_CONFIG_DRIVE_OPEN_DRAIN:
- return regmap_update_bits(bdgpio->regmap,
+ return regmap_update_bits(regmap,
BD71815_REG_GPO,
BD71815_GPIO_DRIVE_MASK << offset,
BD71815_GPIO_OPEN_DRAIN << offset);
case PIN_CONFIG_DRIVE_PUSH_PULL:
- return regmap_update_bits(bdgpio->regmap,
+ return regmap_update_bits(regmap,
BD71815_REG_GPO,
BD71815_GPIO_DRIVE_MASK << offset,
BD71815_GPIO_CMOS << offset);
default:
+ dev_err(bdgpio->dev, "Unsupported config (0x%lx)\n", config);
break;
}
return -ENOTSUPP;
}

-/* BD71815 GPIO is actually GPO */
-static int bd71815gpo_direction_get(struct gpio_chip *gc, unsigned int offset)
-{
- return GPIO_LINE_DIRECTION_OUT;
-}
-
-/* Template for GPIO chip */
-static const struct gpio_chip bd71815gpo_chip = {
- .label = "bd71815",
- .owner = THIS_MODULE,
- .get = bd71815gpo_get,
- .get_direction = bd71815gpo_direction_get,
- .set = bd71815gpo_set,
- .set_config = bd71815_gpio_set_config,
- .can_sleep = true,
-};
-
#define BD71815_TWO_GPIOS GENMASK(1, 0)
#define BD71815_ONE_GPIO BIT(0)

@@ -111,14 +64,16 @@ static const struct gpio_chip bd71815gpo_chip = {
* but allows using it by providing the DT property
* "rohm,enable-hidden-gpo".
*/
-static int bd71815_init_valid_mask(struct gpio_chip *gc,
+static int bd71815_init_valid_mask(struct regmap *regmap, void *drvdata,
unsigned long *valid_mask,
unsigned int ngpios)
{
+ struct bd71815_gpio *bdgpio = (struct bd71815_gpio *)drvdata;
+
if (ngpios != 2)
return 0;

- if (gc->parent && device_property_present(gc->parent,
+ if (bdgpio->dev && device_property_present(bdgpio->dev->parent,
"rohm,enable-hidden-gpo"))
*valid_mask = BD71815_TWO_GPIOS;
else
@@ -127,9 +82,19 @@ static int bd71815_init_valid_mask(struct gpio_chip *gc,
return 0;
}

+/* Template for regmap gpio config */
+static const struct gpio_regmap_config gpio_cfg_template = {
+ .label = "bd71815",
+ .reg_set_base = BD71815_REG_GPO,
+ .ngpio = 2,
+ .set_config = bd71815_gpio_set_config,
+ .init_valid_mask = bd71815_init_valid_mask,
+};
+
static int gpo_bd71815_probe(struct platform_device *pdev)
{
struct bd71815_gpio *g;
+ struct gpio_regmap_config cfg;
struct device *parent, *dev;

/*
@@ -144,30 +109,15 @@ static int gpo_bd71815_probe(struct platform_device *pdev)
if (!g)
return -ENOMEM;

- g->chip = bd71815gpo_chip;
-
- /*
- * FIXME: As writing of this the sysfs interface for GPIO control does
- * not respect the valid_mask. Do not trust it but rather set the ngpios
- * to 1 if "rohm,enable-hidden-gpo" is not given.
- *
- * This check can be removed later if the sysfs export is fixed and
- * if the fix is backported.
- *
- * For now it is safest to just set the ngpios though.
- */
- if (device_property_present(parent, "rohm,enable-hidden-gpo"))
- g->chip.ngpio = 2;
- else
- g->chip.ngpio = 1;
-
- g->chip.init_valid_mask = bd71815_init_valid_mask;
- g->chip.base = -1;
- g->chip.parent = parent;
- g->regmap = dev_get_regmap(parent, NULL);
g->dev = dev;

- return devm_gpiochip_add_data(dev, &g->chip, g);
+ cfg = gpio_cfg_template;
+ cfg.parent = parent;
+ cfg.regmap = dev_get_regmap(parent, NULL);
+ cfg.fwnode = dev_fwnode(dev);
+ cfg.drvdata = g;
+
+ return PTR_ERR_OR_ZERO(devm_gpio_regmap_register(dev, &cfg));
}

static struct platform_driver gpo_bd71815_driver = {
--
2.25.4


--
Matti Vaittinen, Linux device drivers
ROHM Semiconductors, Finland SWDC
Kiviharjunlenkki 1E
90220 OULU
FINLAND

~~~ "I don't think so," said Rene Descartes. Just then he vanished ~~~
Simon says - in Latin please.
~~~ "non cogito me" dixit Rene Descarte, deinde evanescavit ~~~
Thanks to Simon Glass for the translation =]

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