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staging: greybus: arche-apb-ctrl.c: Switch to the gpio descriptor interface 

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nishad Kamdar 2019-01-14 20:27:31 +05:30 committed by Greg Kroah-Hartman
parent e28dd69ee8
commit fbacec8f2a
1 changed files with 61 additions and 91 deletions
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152
drivers/staging/greybus/arche-apb-ctrl.c
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@ -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;
}