[PATCH v7 0/3] greybus: gpio: Switch to the gpio descriptor interface

[PATCH v7 0/3] greybus: gpio: Switch to the gpio descriptor interface

[Nishad Kamdar]

This patch series converts uses of the old GPIO API to the GPIO
descriptor API. It also converts the GPIO driver to use the
GPIO irqchip library GPIOLIB_IRQCHIP instead of repimplementing
the same.

Chnages in v7:
 - Combine the three patches together.
Changes in v6:
 - Patchset now contains two patches as the patch
   1 has been accepted.
 - Changes mentioned in individual patches of the set.
Changes in v5:
 - Drop the patch which uses gpiochip_get_data() in place of
   gpio_chip_to_gb_gpio_controller() as of now.
 - This is because it currently breaks the driver, since
   gpiochip_add() sets the data pointer to NULL.  
Changes in v4:
 - Changes mentioned in individual patches of the set.
Changes in v3:
 - Combines the latest versions of the three greybus patches together
   in a patch series.

Nishad Kamdar (3):
  staging: greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP
  staging: greybus: arche-apb-ctrl.c: Switch to the gpio descriptor
    interface
  staging: greybus: arche-platform: Switch to the gpio descriptor
    interface

 drivers/staging/greybus/Kconfig          |   1 +
 drivers/staging/greybus/TODO             |   2 -
 drivers/staging/greybus/arche-apb-ctrl.c | 152 +++++++++-------------
 drivers/staging/greybus/arche-platform.c | 124 ++++++------------
 drivers/staging/greybus/gpio.c           | 156 ++---------------------
 5 files changed, 113 insertions(+), 322 deletions(-)

-- 
2.17.1

[PATCH v7 1/3] staging: greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP

[Nishad Kamdar]

Convert the GPIO driver to use the GPIO irqchip library
GPIOLIB_IRQCHIP instead of reimplementing the same.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
---
Changes in v7:
 - No change.
Changes in v5:
 - Restore "struct irq_chip irqc" in "struct gb_gpio_controller"
   This is because we cannot use the gpio-chip irqchip, as that
   will register the irqchip automatically and possibly in an
   incompatible way.
Changes in v4:
 - Remove changes related to conversion to gpiochip_get_data() to
   include it as a new patch.
 - Remove the 'struct irq_chip' field from 'struct gb_gpio_controller'
   as struct gpio_chip will have an irqchip whenever
   CONFIG_GPIOLIB_IRQCHIP is selected.
 - Update the TODO file as per the changes.
Changes in v3:
 - Combine patches as into a patch series.
Changes in v2:
 - Retained irq.h and irqdomain.h headers.
 - Dropped function gb_gpio_irqchip_add() and
   called gpiochip_irqchip_add() from probe().
 - Referred https://lkml.kernel.org/r/1476054589-28422-1-git-send-email-linus.walleij@linaro.org.
---
 drivers/staging/greybus/Kconfig |   1 +
 drivers/staging/greybus/TODO    |   2 -
 drivers/staging/greybus/gpio.c  | 156 ++------------------------------
 3 files changed, 11 insertions(+), 148 deletions(-)

diff --git a/drivers/staging/greybus/Kconfig b/drivers/staging/greybus/Kconfig
index ab096bcef98c..b571e4e8060b 100644
--- a/drivers/staging/greybus/Kconfig
+++ b/drivers/staging/greybus/Kconfig
@@ -148,6 +148,7 @@ if GREYBUS_BRIDGED_PHY
 config GREYBUS_GPIO
 	tristate "Greybus GPIO Bridged PHY driver"
 	depends on GPIOLIB
+	select GPIOLIB_IRQCHIP
 	---help---
 	  Select this option if you have a device that follows the
 	  Greybus GPIO Bridged PHY Class specification.
diff --git a/drivers/staging/greybus/TODO b/drivers/staging/greybus/TODO
index 3b90a5711998..31f1f2cb401c 100644
--- a/drivers/staging/greybus/TODO
+++ b/drivers/staging/greybus/TODO
@@ -1,5 +1,3 @@
 * Convert all uses of the old GPIO API from <linux/gpio.h> to the
   GPIO descriptor API in <linux/gpio/consumer.h> and look up GPIO
   lines from device tree or ACPI.
-* Convert the GPIO driver to use the GPIO irqchip library
-  GPIOLIB_IRQCHIP instead of reimplementing the same.
diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c
index e110681e6f86..3151004d26fb 100644
--- a/drivers/staging/greybus/gpio.c
+++ b/drivers/staging/greybus/gpio.c
@@ -9,9 +9,9 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/gpio.h>
 #include <linux/irq.h>
 #include <linux/irqdomain.h>
+#include <linux/gpio/driver.h>
 #include <linux/mutex.h>
 
 #include "greybus.h"
@@ -39,11 +39,6 @@ struct gb_gpio_controller {
 
 	struct gpio_chip	chip;
 	struct irq_chip		irqc;
-	struct irq_chip		*irqchip;
-	struct irq_domain	*irqdomain;
-	unsigned int		irq_base;
-	irq_flow_handler_t	irq_handler;
-	unsigned int		irq_default_type;
 	struct mutex		irq_lock;
 };
 #define gpio_chip_to_gb_gpio_controller(chip) \
@@ -391,7 +386,7 @@ static int gb_gpio_request_handler(struct gb_operation *op)
 		return -EINVAL;
 	}
 
-	irq = irq_find_mapping(ggc->irqdomain, event->which);
+	irq = irq_find_mapping(ggc->chip.irq.domain, event->which);
 	if (!irq) {
 		dev_err(dev, "failed to find IRQ\n");
 		return -EINVAL;
@@ -506,135 +501,6 @@ static int gb_gpio_controller_setup(struct gb_gpio_controller *ggc)
 	return ret;
 }
 
-/**
- * gb_gpio_irq_map() - maps an IRQ into a GB gpio irqchip
- * @d: the irqdomain used by this irqchip
- * @irq: the global irq number used by this GB gpio irqchip irq
- * @hwirq: the local IRQ/GPIO line offset on this GB gpio
- *
- * This function will set up the mapping for a certain IRQ line on a
- * GB gpio by assigning the GB gpio as chip data, and using the irqchip
- * stored inside the GB gpio.
- */
-static int gb_gpio_irq_map(struct irq_domain *domain, unsigned int irq,
-			   irq_hw_number_t hwirq)
-{
-	struct gpio_chip *chip = domain->host_data;
-	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
-
-	irq_set_chip_data(irq, ggc);
-	irq_set_chip_and_handler(irq, ggc->irqchip, ggc->irq_handler);
-	irq_set_noprobe(irq);
-	/*
-	 * No set-up of the hardware will happen if IRQ_TYPE_NONE
-	 * is passed as default type.
-	 */
-	if (ggc->irq_default_type != IRQ_TYPE_NONE)
-		irq_set_irq_type(irq, ggc->irq_default_type);
-
-	return 0;
-}
-
-static void gb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq)
-{
-	irq_set_chip_and_handler(irq, NULL, NULL);
-	irq_set_chip_data(irq, NULL);
-}
-
-static const struct irq_domain_ops gb_gpio_domain_ops = {
-	.map	= gb_gpio_irq_map,
-	.unmap	= gb_gpio_irq_unmap,
-};
-
-/**
- * gb_gpio_irqchip_remove() - removes an irqchip added to a gb_gpio_controller
- * @ggc: the gb_gpio_controller to remove the irqchip from
- *
- * This is called only from gb_gpio_remove()
- */
-static void gb_gpio_irqchip_remove(struct gb_gpio_controller *ggc)
-{
-	unsigned int offset;
-
-	/* Remove all IRQ mappings and delete the domain */
-	if (ggc->irqdomain) {
-		for (offset = 0; offset < (ggc->line_max + 1); offset++)
-			irq_dispose_mapping(irq_find_mapping(ggc->irqdomain,
-							     offset));
-		irq_domain_remove(ggc->irqdomain);
-	}
-
-	if (ggc->irqchip)
-		ggc->irqchip = NULL;
-}
-
-/**
- * gb_gpio_irqchip_add() - adds an irqchip to a gpio chip
- * @chip: the gpio chip to add the irqchip to
- * @irqchip: the irqchip to add to the adapter
- * @first_irq: if not dynamically assigned, the base (first) IRQ to
- * allocate gpio irqs from
- * @handler: the irq handler to use (often a predefined irq core function)
- * @type: the default type for IRQs on this irqchip, pass IRQ_TYPE_NONE
- * to have the core avoid setting up any default type in the hardware.
- *
- * This function closely associates a certain irqchip with a certain
- * gpio chip, providing an irq domain to translate the local IRQs to
- * global irqs, and making sure that the gpio chip
- * is passed as chip data to all related functions. Driver callbacks
- * need to use container_of() to get their local state containers back
- * from the gpio chip passed as chip data. An irqdomain will be stored
- * in the gpio chip that shall be used by the driver to handle IRQ number
- * translation. The gpio chip will need to be initialized and registered
- * before calling this function.
- */
-static int gb_gpio_irqchip_add(struct gpio_chip *chip,
-			       struct irq_chip *irqchip,
-			       unsigned int first_irq,
-			       irq_flow_handler_t handler,
-			       unsigned int type)
-{
-	struct gb_gpio_controller *ggc;
-	unsigned int offset;
-	unsigned int irq_base;
-
-	if (!chip || !irqchip)
-		return -EINVAL;
-
-	ggc = gpio_chip_to_gb_gpio_controller(chip);
-
-	ggc->irqchip = irqchip;
-	ggc->irq_handler = handler;
-	ggc->irq_default_type = type;
-	ggc->irqdomain = irq_domain_add_simple(NULL,
-					       ggc->line_max + 1, first_irq,
-					       &gb_gpio_domain_ops, chip);
-	if (!ggc->irqdomain) {
-		ggc->irqchip = NULL;
-		return -EINVAL;
-	}
-
-	/*
-	 * Prepare the mapping since the irqchip shall be orthogonal to
-	 * any gpio calls. If the first_irq was zero, this is
-	 * necessary to allocate descriptors for all IRQs.
-	 */
-	for (offset = 0; offset < (ggc->line_max + 1); offset++) {
-		irq_base = irq_create_mapping(ggc->irqdomain, offset);
-		if (offset == 0)
-			ggc->irq_base = irq_base;
-	}
-
-	return 0;
-}
-
-static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
-{
-	struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip);
-
-	return irq_find_mapping(ggc->irqdomain, offset);
-}
-
 static int gb_gpio_probe(struct gbphy_device *gbphy_dev,
 			 const struct gbphy_device_id *id)
 {
@@ -694,7 +560,6 @@ static int gb_gpio_probe(struct gbphy_device *gbphy_dev,
 	gpio->get = gb_gpio_get;
 	gpio->set = gb_gpio_set;
 	gpio->set_config = gb_gpio_set_config;
-	gpio->to_irq = gb_gpio_to_irq;
 	gpio->base = -1;		/* Allocate base dynamically */
 	gpio->ngpio = ggc->line_max + 1;
 	gpio->can_sleep = true;
@@ -703,24 +568,24 @@ static int gb_gpio_probe(struct gbphy_device *gbphy_dev,
 	if (ret)
 		goto exit_line_free;
 
-	ret = gb_gpio_irqchip_add(gpio, irqc, 0,
-				  handle_level_irq, IRQ_TYPE_NONE);
+	ret = gpiochip_add(gpio);
 	if (ret) {
-		dev_err(&gbphy_dev->dev, "failed to add irq chip: %d\n", ret);
+		dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret);
 		goto exit_line_free;
 	}
 
-	ret = gpiochip_add(gpio);
+	ret = gpiochip_irqchip_add(gpio, irqc, 0, handle_level_irq,
+				   IRQ_TYPE_NONE);
 	if (ret) {
-		dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret);
-		goto exit_gpio_irqchip_remove;
+		dev_err(&gbphy_dev->dev, "failed to add irq chip: %d\n", ret);
+		goto exit_gpiochip_remove;
 	}
 
 	gbphy_runtime_put_autosuspend(gbphy_dev);
 	return 0;
 
-exit_gpio_irqchip_remove:
-	gb_gpio_irqchip_remove(ggc);
+exit_gpiochip_remove:
+	gpiochip_remove(gpio);
 exit_line_free:
 	kfree(ggc->lines);
 exit_connection_disable:
@@ -744,7 +609,6 @@ static void gb_gpio_remove(struct gbphy_device *gbphy_dev)
 
 	gb_connection_disable_rx(connection);
 	gpiochip_remove(&ggc->chip);
-	gb_gpio_irqchip_remove(ggc);
 	gb_connection_disable(connection);
 	gb_connection_destroy(connection);
 	kfree(ggc->lines);
-- 
2.17.1

Re: [PATCH v7 1/3] staging: greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP

[Greg Kroah-Hartman]

On Mon, Jan 14, 2019 at 08:26:16PM +0530, Nishad Kamdar wrote:
> Convert the GPIO driver to use the GPIO irqchip library
> GPIOLIB_IRQCHIP instead of reimplementing the same.
> 
> Reviewed-by: Johan Hovold <johan@kernel.org>
> Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>

Did you test build this patch?

It fails horribly for me:

drivers/staging/greybus/gpio.c: In function ‘gb_gpio_request_handler’:
drivers/staging/greybus/gpio.c:389:34: error: ‘struct gpio_chip’ has no member named ‘irq’
  irq = irq_find_mapping(ggc->chip.irq.domain, event->which);
                                  ^
  CC [M]  drivers/staging/rtl8712/usb_intf.o
drivers/staging/greybus/gpio.c: In function ‘gb_gpio_probe’:
drivers/staging/greybus/gpio.c:577:8: error: implicit declaration of function ‘gpiochip_irqchip_add’; did you mean ‘gpiochip_add’? [-Werror=implicit-function-declaration]
  ret = gpiochip_irqchip_add(gpio, irqc, 0, handle_level_irq,
        ^~~~~~~~~~~~~~~~~~~~
        gpiochip_add


Please be more careful...

greg k-h

Re: [PATCH v7 1/3] staging: greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP

[Greg Kroah-Hartman]

On Tue, Jan 15, 2019 at 04:13:17PM +0100, Greg Kroah-Hartman wrote:
> On Mon, Jan 14, 2019 at 08:26:16PM +0530, Nishad Kamdar wrote:
> > Convert the GPIO driver to use the GPIO irqchip library
> > GPIOLIB_IRQCHIP instead of reimplementing the same.
> > 
> > Reviewed-by: Johan Hovold <johan@kernel.org>
> > Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
> 
> Did you test build this patch?
> 
> It fails horribly for me:
> 
> drivers/staging/greybus/gpio.c: In function ‘gb_gpio_request_handler’:
> drivers/staging/greybus/gpio.c:389:34: error: ‘struct gpio_chip’ has no member named ‘irq’
>   irq = irq_find_mapping(ggc->chip.irq.domain, event->which);
>                                   ^
>   CC [M]  drivers/staging/rtl8712/usb_intf.o
> drivers/staging/greybus/gpio.c: In function ‘gb_gpio_probe’:
> drivers/staging/greybus/gpio.c:577:8: error: implicit declaration of function ‘gpiochip_irqchip_add’; did you mean ‘gpiochip_add’? [-Werror=implicit-function-declaration]
>   ret = gpiochip_irqchip_add(gpio, irqc, 0, handle_level_irq,
>         ^~~~~~~~~~~~~~~~~~~~
>         gpiochip_add
> 
> 
> Please be more careful...

Hm, this seems to be a problem on my side.  You selected the new config
symbol, but my quick build system didn't catch that and it didnt
regenerate the kernel configuration, which causes this problem.

So this is fine, sorry for the noise, my fault.

greg k-h

[PATCH v7 2/3] staging: greybus: arche-apb-ctrl.c: Switch to the gpio descriptor interface

[Nishad Kamdar]

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 v7:
 - No change.
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;
 }
-- 
2.17.1

[PATCH v7 3/3] staging: greybus: arche-platform: Switch to the gpio descriptor interface

[Nishad Kamdar]

Use the gpiod interface instead of the deprecated old non-descriptor
interface while continuing to ignore gpio flags from device tree in
"svc_reset_onoff()" for now.

Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
---
Changes in v7:
  - No change.
Changes in v6:
  - Make error messages consistent.
Changes in v5:
  - Change the commit message.
  - Restore the names of the gpio device-tree properties without
    the "-gpio" suffix.
Changes in v4:
 - Move 'gpio_desc *svc_sysboot' below the reset flag
   as it is more logical to have reset flag below
   reset gpio.
 - Remove a few unnecessary line breaks.
Changes in v3:
 - Add this patch to a patchset.
Changes in v2:
 - Move comment to the same line as to what it applies to.
---
 drivers/staging/greybus/arche-platform.c | 124 ++++++++---------------
 1 file changed, 41 insertions(+), 83 deletions(-)

diff --git a/drivers/staging/greybus/arche-platform.c b/drivers/staging/greybus/arche-platform.c
index 4c36e88766e7..6eb842040c22 100644
--- a/drivers/staging/greybus/arche-platform.c
+++ b/drivers/staging/greybus/arche-platform.c
@@ -8,10 +8,9 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/module.h>
-#include <linux/of_gpio.h>
 #include <linux/of_platform.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
@@ -45,14 +44,14 @@ enum svc_wakedetect_state {
 
 struct arche_platform_drvdata {
 	/* Control GPIO signals to and from AP <=> SVC */
-	int svc_reset_gpio;
+	struct gpio_desc *svc_reset;
 	bool is_reset_act_hi;
-	int svc_sysboot_gpio;
-	int wake_detect_gpio; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
+	struct gpio_desc *svc_sysboot;
+	struct gpio_desc *wake_detect; /* bi-dir,maps to WAKE_MOD & WAKE_FRAME signals */
 
 	enum arche_platform_state state;
 
-	int svc_refclk_req;
+	struct gpio_desc *svc_refclk_req;
 	struct clk *svc_ref_clk;
 
 	struct pinctrl *pinctrl;
@@ -85,9 +84,9 @@ static void arche_platform_set_wake_detect_state(
 	arche_pdata->wake_detect_state = state;
 }
 
-static inline void svc_reset_onoff(unsigned int gpio, bool onoff)
+static inline void svc_reset_onoff(struct gpio_desc *gpio, bool onoff)
 {
-	gpio_set_value(gpio, onoff);
+	gpiod_set_raw_value(gpio, onoff);
 }
 
 static int apb_cold_boot(struct device *dev, void *data)
@@ -116,7 +115,6 @@ static int apb_poweroff(struct device *dev, void *data)
 static void arche_platform_wd_irq_en(struct arche_platform_drvdata *arche_pdata)
 {
 	/* Enable interrupt here, to read event back from SVC */
-	gpio_direction_input(arche_pdata->wake_detect_gpio);
 	enable_irq(arche_pdata->wake_detect_irq);
 }
 
@@ -160,7 +158,7 @@ static irqreturn_t arche_platform_wd_irq(int irq, void *devid)
 
 	spin_lock_irqsave(&arche_pdata->wake_lock, flags);
 
-	if (gpio_get_value(arche_pdata->wake_detect_gpio)) {
+	if (gpiod_get_value(arche_pdata->wake_detect)) {
 		/* wake/detect rising */
 
 		/*
@@ -224,10 +222,9 @@ arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
 
 	dev_info(arche_pdata->dev, "Booting from cold boot state\n");
 
-	svc_reset_onoff(arche_pdata->svc_reset_gpio,
-			arche_pdata->is_reset_act_hi);
+	svc_reset_onoff(arche_pdata->svc_reset, arche_pdata->is_reset_act_hi);
 
-	gpio_set_value(arche_pdata->svc_sysboot_gpio, 0);
+	gpiod_set_value(arche_pdata->svc_sysboot, 0);
 	usleep_range(100, 200);
 
 	ret = clk_prepare_enable(arche_pdata->svc_ref_clk);
@@ -238,8 +235,7 @@ arche_platform_coldboot_seq(struct arche_platform_drvdata *arche_pdata)
 	}
 
 	/* bring SVC out of reset */
-	svc_reset_onoff(arche_pdata->svc_reset_gpio,
-			!arche_pdata->is_reset_act_hi);
+	svc_reset_onoff(arche_pdata->svc_reset, !arche_pdata->is_reset_act_hi);
 
 	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_ACTIVE);
 
@@ -259,10 +255,9 @@ arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
 
 	dev_info(arche_pdata->dev, "Switching to FW flashing state\n");
 
-	svc_reset_onoff(arche_pdata->svc_reset_gpio,
-			arche_pdata->is_reset_act_hi);
+	svc_reset_onoff(arche_pdata->svc_reset, arche_pdata->is_reset_act_hi);
 
-	gpio_set_value(arche_pdata->svc_sysboot_gpio, 1);
+	gpiod_set_value(arche_pdata->svc_sysboot, 1);
 
 	usleep_range(100, 200);
 
@@ -273,8 +268,7 @@ arche_platform_fw_flashing_seq(struct arche_platform_drvdata *arche_pdata)
 		return ret;
 	}
 
-	svc_reset_onoff(arche_pdata->svc_reset_gpio,
-			!arche_pdata->is_reset_act_hi);
+	svc_reset_onoff(arche_pdata->svc_reset,	!arche_pdata->is_reset_act_hi);
 
 	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_FW_FLASHING);
 
@@ -305,8 +299,7 @@ arche_platform_poweroff_seq(struct arche_platform_drvdata *arche_pdata)
 	clk_disable_unprepare(arche_pdata->svc_ref_clk);
 
 	/* As part of exit, put APB back in reset state */
-	svc_reset_onoff(arche_pdata->svc_reset_gpio,
-			arche_pdata->is_reset_act_hi);
+	svc_reset_onoff(arche_pdata->svc_reset,	arche_pdata->is_reset_act_hi);
 
 	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
 }
@@ -435,6 +428,7 @@ static int arche_platform_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct device_node *np = dev->of_node;
 	int ret;
+	unsigned int flags;
 
 	arche_pdata = devm_kzalloc(&pdev->dev, sizeof(*arche_pdata),
 				   GFP_KERNEL);
@@ -444,61 +438,33 @@ static int arche_platform_probe(struct platform_device *pdev)
 	/* setup svc reset gpio */
 	arche_pdata->is_reset_act_hi = of_property_read_bool(np,
 							     "svc,reset-active-high");
-	arche_pdata->svc_reset_gpio = of_get_named_gpio(np,
-							"svc,reset-gpio",
-							0);
-	if (!gpio_is_valid(arche_pdata->svc_reset_gpio)) {
-		dev_err(dev, "failed to get reset-gpio\n");
-		return arche_pdata->svc_reset_gpio;
-	}
-	ret = devm_gpio_request(dev, arche_pdata->svc_reset_gpio, "svc-reset");
-	if (ret) {
-		dev_err(dev, "failed to request svc-reset gpio:%d\n", ret);
-		return ret;
-	}
-	ret = gpio_direction_output(arche_pdata->svc_reset_gpio,
-				    arche_pdata->is_reset_act_hi);
-	if (ret) {
-		dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
+	if (arche_pdata->is_reset_act_hi)
+		flags = GPIOD_OUT_HIGH;
+	else
+		flags = GPIOD_OUT_LOW;
+
+	arche_pdata->svc_reset = devm_gpiod_get(dev, "svc,reset", flags);
+	if (IS_ERR(arche_pdata->svc_reset)) {
+		ret = PTR_ERR(arche_pdata->svc_reset);
+		dev_err(dev, "failed to request svc-reset GPIO: %d\n", ret);
 		return ret;
 	}
 	arche_platform_set_state(arche_pdata, ARCHE_PLATFORM_STATE_OFF);
 
-	arche_pdata->svc_sysboot_gpio = of_get_named_gpio(np,
-							  "svc,sysboot-gpio",
-							  0);
-	if (!gpio_is_valid(arche_pdata->svc_sysboot_gpio)) {
-		dev_err(dev, "failed to get sysboot gpio\n");
-		return arche_pdata->svc_sysboot_gpio;
-	}
-	ret = devm_gpio_request(dev, arche_pdata->svc_sysboot_gpio, "sysboot0");
-	if (ret) {
-		dev_err(dev, "failed to request sysboot0 gpio:%d\n", ret);
-		return ret;
-	}
-	ret = gpio_direction_output(arche_pdata->svc_sysboot_gpio, 0);
-	if (ret) {
-		dev_err(dev, "failed to set svc-reset gpio dir:%d\n", ret);
+	arche_pdata->svc_sysboot = devm_gpiod_get(dev, "svc,sysboot",
+						  GPIOD_OUT_LOW);
+	if (IS_ERR(arche_pdata->svc_sysboot)) {
+		ret = PTR_ERR(arche_pdata->svc_sysboot);
+		dev_err(dev, "failed to request sysboot0 GPIO: %d\n", ret);
 		return ret;
 	}
 
 	/* setup the clock request gpio first */
-	arche_pdata->svc_refclk_req = of_get_named_gpio(np,
-							"svc,refclk-req-gpio",
-							0);
-	if (!gpio_is_valid(arche_pdata->svc_refclk_req)) {
-		dev_err(dev, "failed to get svc clock-req gpio\n");
-		return arche_pdata->svc_refclk_req;
-	}
-	ret = devm_gpio_request(dev, arche_pdata->svc_refclk_req,
-				"svc-clk-req");
-	if (ret) {
-		dev_err(dev, "failed to request svc-clk-req gpio: %d\n", ret);
-		return ret;
-	}
-	ret = gpio_direction_input(arche_pdata->svc_refclk_req);
-	if (ret) {
-		dev_err(dev, "failed to set svc-clk-req gpio dir :%d\n", ret);
+	arche_pdata->svc_refclk_req = devm_gpiod_get(dev, "svc,refclk-req",
+						     GPIOD_IN);
+	if (IS_ERR(arche_pdata->svc_refclk_req)) {
+		ret = PTR_ERR(arche_pdata->svc_refclk_req);
+		dev_err(dev, "failed to request svc-clk-req GPIO: %d\n", ret);
 		return ret;
 	}
 
@@ -515,19 +481,11 @@ static int arche_platform_probe(struct platform_device *pdev)
 	arche_pdata->num_apbs = of_get_child_count(np);
 	dev_dbg(dev, "Number of APB's available - %d\n", arche_pdata->num_apbs);
 
-	arche_pdata->wake_detect_gpio = of_get_named_gpio(np,
-							  "svc,wake-detect-gpio",
-							  0);
-	if (arche_pdata->wake_detect_gpio < 0) {
-		dev_err(dev, "failed to get wake detect gpio\n");
-		return arche_pdata->wake_detect_gpio;
-	}
-
-	ret = devm_gpio_request(dev, arche_pdata->wake_detect_gpio,
-				"wake detect");
-	if (ret) {
-		dev_err(dev, "Failed requesting wake_detect gpio %d\n",
-			arche_pdata->wake_detect_gpio);
+	arche_pdata->wake_detect = devm_gpiod_get(dev, "svc,wake-detect",
+						  GPIOD_IN);
+	if (IS_ERR(arche_pdata->wake_detect)) {
+		ret = PTR_ERR(arche_pdata->wake_detect);
+		dev_err(dev, "Failed requesting wake_detect GPIO: %d\n", ret);
 		return ret;
 	}
 
@@ -538,7 +496,7 @@ static int arche_platform_probe(struct platform_device *pdev)
 	spin_lock_init(&arche_pdata->wake_lock);
 	mutex_init(&arche_pdata->platform_state_mutex);
 	arche_pdata->wake_detect_irq =
-		gpio_to_irq(arche_pdata->wake_detect_gpio);
+		gpiod_to_irq(arche_pdata->wake_detect);
 
 	ret = devm_request_threaded_irq(dev, arche_pdata->wake_detect_irq,
 					arche_platform_wd_irq,
-- 
2.17.1

Re: [PATCH v7 0/3] greybus: gpio: Switch to the gpio descriptor interface

[Johan Hovold]

On Mon, Jan 14, 2019 at 08:25:07PM +0530, Nishad Kamdar wrote:
> This patch series converts uses of the old GPIO API to the GPIO
> descriptor API. It also converts the GPIO driver to use the
> GPIO irqchip library GPIOLIB_IRQCHIP instead of repimplementing
> the same.
> 
> Chnages in v7:
>  - Combine the three patches together.

Thanks for resending, all looks good now.

Johan