Use the gpiod interface instead of the deprecated old non-descriptor interface while continuing to ignore gpio flags from device tree in functions "deassert_reset()" and "assert_reset()" for now.
Reviewed-by: Johan Hovold johan@kernel.org Signed-off-by: Nishad Kamdar nishadkamdar@gmail.com --- Changes in v6: - Remove some unnecessary line breaks. Changes in v5: - Change the commit message. - Restore the names of the gpio device-tree properties without the "-gpio" suffix. 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 | 152 +++++++++-------------- 1 file changed, 61 insertions(+), 91 deletions(-)
diff --git a/drivers/staging/greybus/arche-apb-ctrl.c b/drivers/staging/greybus/arche-apb-ctrl.c index be5ffed90bcf..bbf3ba744fc4 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, "spi-en", 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 +318,44 @@ 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, "reset", 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, "boot-ret", 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, "pwr-off", 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, "clock-en", 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, "pwr-down", 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 +378,8 @@ 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; }