[PATCH v4 3/4] staging: greybus: arche-apb-ctrl.c: Switch to the gpio descriptor interface

Nishad Kamdar
2018-12-22T16:56:27Z

Use the gpiod interface instead of the deprecated old non-descriptor
interface.

Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
---
Changes in v4:
- Use gpiod_set_raw_value() for deassert_reset() and
assert_reset() as gpiod_set_value() will change the
sematics of these calls by taking any gpio flags
into account.
- Remove some unnecesssary line breaks.
- Restore 'spi_en' gpio check in fw_flashing_seq()
as it is currently optional.
Changes in v3:
- Add this patch in a patchset.
Changes in v2:
- Resolved compilation errors.
---
drivers/staging/greybus/arche-apb-ctrl.c | 154 ++++++++++-------------
1 file changed, 63 insertions(+), 91 deletions(-)

diff --git a/drivers/staging/greybus/arche-apb-ctrl.c b/drivers/staging/greybus/arche-apb-ctrl.c
index be5ffed90bcf..57eecd0dd0a6 100644
--- a/drivers/staging/greybus/arche-apb-ctrl.c
+++ b/drivers/staging/greybus/arche-apb-ctrl.c
@@ -8,9 +8,8 @@

#include <linux/clk.h>
#include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
-#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
@@ -24,12 +23,12 @@ static void apb_bootret_deassert(struct device *dev);

struct arche_apb_ctrl_drvdata {
/* Control GPIO signals to and from AP <=> AP Bridges */
- int resetn_gpio;
- int boot_ret_gpio;
- int pwroff_gpio;
- int wake_in_gpio;
- int wake_out_gpio;
- int pwrdn_gpio;
+ struct gpio_desc *resetn;
+ struct gpio_desc *boot_ret;
+ struct gpio_desc *pwroff;
+ struct gpio_desc *wake_in;
+ struct gpio_desc *wake_out;
+ struct gpio_desc *pwrdn;

enum arche_platform_state state;
bool init_disabled;
@@ -37,28 +36,28 @@ struct arche_apb_ctrl_drvdata {
struct regulator *vcore;
struct regulator *vio;

- int clk_en_gpio;
+ struct gpio_desc *clk_en;
struct clk *clk;

struct pinctrl *pinctrl;
struct pinctrl_state *pin_default;

/* V2: SPI Bus control */
- int spi_en_gpio;
+ struct gpio_desc *spi_en;
bool spi_en_polarity_high;
};

/*
* Note that these low level api's are active high
*/
-static inline void deassert_reset(unsigned int gpio)
+static inline void deassert_reset(struct gpio_desc *gpio)
{
- gpio_set_value(gpio, 1);
+ gpiod_set_raw_value(gpio, 1);
}

-static inline void assert_reset(unsigned int gpio)
+static inline void assert_reset(struct gpio_desc *gpio)
{
- gpio_set_value(gpio, 0);
+ gpiod_set_raw_value(gpio, 0);
}

/*
@@ -75,11 +74,10 @@ static int coldboot_seq(struct platform_device *pdev)
return 0;

/* Hold APB in reset state */
- assert_reset(apb->resetn_gpio);
+ assert_reset(apb->resetn);

- if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
- gpio_is_valid(apb->spi_en_gpio))
- devm_gpio_free(dev, apb->spi_en_gpio);
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING && apb->spi_en)
+ devm_gpiod_put(dev, apb->spi_en);

/* Enable power to APB */
if (!IS_ERR(apb->vcore)) {
@@ -101,13 +99,13 @@ static int coldboot_seq(struct platform_device *pdev)
apb_bootret_deassert(dev);

/* On DB3 clock was not mandatory */
- if (gpio_is_valid(apb->clk_en_gpio))
- gpio_set_value(apb->clk_en_gpio, 1);
+ if (apb->clk_en)
+ gpiod_set_value(apb->clk_en, 1);

usleep_range(100, 200);

/* deassert reset to APB : Active-low signal */
- deassert_reset(apb->resetn_gpio);
+ deassert_reset(apb->resetn);

apb->state = ARCHE_PLATFORM_STATE_ACTIVE;

@@ -136,25 +134,25 @@ static int fw_flashing_seq(struct platform_device *pdev)
return ret;
}

- if (gpio_is_valid(apb->spi_en_gpio)) {
+ if (apb->spi_en) {
unsigned long flags;

if (apb->spi_en_polarity_high)
- flags = GPIOF_OUT_INIT_HIGH;
+ flags = GPIOD_OUT_HIGH;
else
- flags = GPIOF_OUT_INIT_LOW;
+ flags = GPIOD_OUT_LOW;

- ret = devm_gpio_request_one(dev, apb->spi_en_gpio,
- flags, "apb_spi_en");
- if (ret) {
- dev_err(dev, "Failed requesting SPI bus en gpio %d\n",
- apb->spi_en_gpio);
+ apb->spi_en = devm_gpiod_get(dev, "gb,spi-en-gpio", flags);
+ if (IS_ERR(apb->spi_en)) {
+ ret = PTR_ERR(apb->spi_en);
+ dev_err(dev, "Failed requesting SPI bus en GPIO: %d\n",
+ ret);
return ret;
}
}

/* for flashing device should be in reset state */
- assert_reset(apb->resetn_gpio);
+ assert_reset(apb->resetn);
apb->state = ARCHE_PLATFORM_STATE_FW_FLASHING;

return 0;
@@ -176,9 +174,8 @@ static int standby_boot_seq(struct platform_device *pdev)
apb->state == ARCHE_PLATFORM_STATE_OFF)
return 0;

- if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
- gpio_is_valid(apb->spi_en_gpio))
- devm_gpio_free(dev, apb->spi_en_gpio);
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING && apb->spi_en)
+ devm_gpiod_put(dev, apb->spi_en);

/*
* As per WDM spec, do nothing
@@ -201,13 +198,12 @@ static void poweroff_seq(struct platform_device *pdev)
if (apb->init_disabled || apb->state == ARCHE_PLATFORM_STATE_OFF)
return;

- if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING &&
- gpio_is_valid(apb->spi_en_gpio))
- devm_gpio_free(dev, apb->spi_en_gpio);
+ if (apb->state == ARCHE_PLATFORM_STATE_FW_FLASHING && apb->spi_en)
+ devm_gpiod_put(dev, apb->spi_en);

/* disable the clock */
- if (gpio_is_valid(apb->clk_en_gpio))
- gpio_set_value(apb->clk_en_gpio, 0);
+ if (apb->clk_en)
+ gpiod_set_value(apb->clk_en, 0);

if (!IS_ERR(apb->vcore) && regulator_is_enabled(apb->vcore) > 0)
regulator_disable(apb->vcore);
@@ -216,7 +212,7 @@ static void poweroff_seq(struct platform_device *pdev)
regulator_disable(apb->vio);

/* As part of exit, put APB back in reset state */
- assert_reset(apb->resetn_gpio);
+ assert_reset(apb->resetn);
apb->state = ARCHE_PLATFORM_STATE_OFF;

/* TODO: May have to send an event to SVC about this exit */
@@ -226,7 +222,7 @@ static void apb_bootret_deassert(struct device *dev)
{
struct arche_apb_ctrl_drvdata *apb = dev_get_drvdata(dev);

- gpio_set_value(apb->boot_ret_gpio, 0);
+ gpiod_set_value(apb->boot_ret, 0);
}

int apb_ctrl_coldboot(struct device *dev)
@@ -322,66 +318,46 @@ static int apb_ctrl_get_devtree_data(struct platform_device *pdev,
struct arche_apb_ctrl_drvdata *apb)
{
struct device *dev = &pdev->dev;
- struct device_node *np = dev->of_node;
int ret;

- apb->resetn_gpio = of_get_named_gpio(np, "reset-gpios", 0);
- if (apb->resetn_gpio < 0) {
- dev_err(dev, "failed to get reset gpio\n");
- return apb->resetn_gpio;
- }
- ret = devm_gpio_request_one(dev, apb->resetn_gpio,
- GPIOF_OUT_INIT_LOW, "apb-reset");
- if (ret) {
- dev_err(dev, "Failed requesting reset gpio %d\n",
- apb->resetn_gpio);
+ apb->resetn = devm_gpiod_get(dev, "gb,reset-gpios", GPIOD_OUT_LOW);
+ if (IS_ERR(apb->resetn)) {
+ ret = PTR_ERR(apb->resetn);
+ dev_err(dev, "Failed requesting reset GPIO: %d\n", ret);
return ret;
}

- apb->boot_ret_gpio = of_get_named_gpio(np, "boot-ret-gpios", 0);
- if (apb->boot_ret_gpio < 0) {
- dev_err(dev, "failed to get boot retention gpio\n");
- return apb->boot_ret_gpio;
- }
- ret = devm_gpio_request_one(dev, apb->boot_ret_gpio,
- GPIOF_OUT_INIT_LOW, "boot retention");
- if (ret) {
- dev_err(dev, "Failed requesting bootret gpio %d\n",
- apb->boot_ret_gpio);
+ apb->boot_ret = devm_gpiod_get(dev, "gb,boot-ret-gpios", GPIOD_OUT_LOW);
+ if (IS_ERR(apb->boot_ret)) {
+ ret = PTR_ERR(apb->boot_ret);
+ dev_err(dev, "Failed requesting bootret GPIO: %d\n", ret);
return ret;
}

/* It's not mandatory to support power management interface */
- apb->pwroff_gpio = of_get_named_gpio(np, "pwr-off-gpios", 0);
- if (apb->pwroff_gpio < 0) {
- dev_err(dev, "failed to get power off gpio\n");
- return apb->pwroff_gpio;
- }
- ret = devm_gpio_request_one(dev, apb->pwroff_gpio,
- GPIOF_IN, "pwroff_n");
- if (ret) {
- dev_err(dev, "Failed requesting pwroff_n gpio %d\n",
- apb->pwroff_gpio);
+ apb->pwroff = devm_gpiod_get_optional(dev, "gb,pwr-off-gpios",
+ GPIOD_IN);
+ if (IS_ERR(apb->pwroff)) {
+ ret = PTR_ERR(apb->pwroff);
+ dev_err(dev, "Failed requesting pwroff_n GPIO: %d\n", ret);
return ret;
}

/* Do not make clock mandatory as of now (for DB3) */
- apb->clk_en_gpio = of_get_named_gpio(np, "clock-en-gpio", 0);
- if (apb->clk_en_gpio < 0) {
- dev_warn(dev, "failed to get clock en gpio\n");
- } else if (gpio_is_valid(apb->clk_en_gpio)) {
- ret = devm_gpio_request_one(dev, apb->clk_en_gpio,
- GPIOF_OUT_INIT_LOW, "apb_clk_en");
- if (ret) {
- dev_warn(dev, "Failed requesting APB clock en gpio %d\n",
- apb->clk_en_gpio);
- return ret;
- }
+ apb->clk_en = devm_gpiod_get_optional(dev, "gb,clock-en-gpio",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(apb->clk_en)) {
+ ret = PTR_ERR(apb->clk_en);
+ dev_err(dev, "Failed requesting APB clock en GPIO: %d\n", ret);
+ return ret;
}

- apb->pwrdn_gpio = of_get_named_gpio(np, "pwr-down-gpios", 0);
- if (apb->pwrdn_gpio < 0)
- dev_warn(dev, "failed to get power down gpio\n");
+ apb->pwrdn = devm_gpiod_get(dev, "gb,pwr-down-gpios", GPIOD_OUT_LOW);
+ if (IS_ERR(apb->pwrdn)) {
+ ret = PTR_ERR(apb->pwrdn);
+ dev_warn(dev, "Failed requesting power down GPIO: %d\n", ret);
+ return ret;
+ }

/* Regulators are optional, as we may have fixed supply coming in */
apb->vcore = devm_regulator_get(dev, "vcore");
@@ -404,12 +380,8 @@ static int apb_ctrl_get_devtree_data(struct platform_device *pdev,
}

/* Only applicable for platform >= V2 */
- apb->spi_en_gpio = of_get_named_gpio(np, "spi-en-gpio", 0);
- if (apb->spi_en_gpio >= 0) {
- if (of_property_read_bool(pdev->dev.of_node,
- "spi-en-active-high"))
- apb->spi_en_polarity_high = true;
- }
+ if (of_property_read_bool(pdev->dev.of_node, "gb,spi-en-active-high"))
+ apb->spi_en_polarity_high = true;

return 0;
}
--
2.17.1