[PATCH v2 0/5] powerpc: convert board-file GPIO chips to using new value setters

[PATCH v2 0/5] powerpc: convert board-file GPIO chips to using new value setters

[Bartosz Golaszewski]

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. We're in the process of 
converting all GPIO drivers to using the new API. This series converts 
all powerpc board-file level controllers.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
Changes in v2:
- propagate the return value of i2c_smbus_write_byte_data() in
  mcu_gpio_set() (Christophe Leroy)
- Link to v1: https://lore.kernel.org/r/20250408-gpiochip-set-rv-powerpc-v1-0-73dc1ebc6ef1@linaro.org

---
Bartosz Golaszewski (5):
      powerpc: sysdev/gpio: use new line value setter callbacks
      powerpc: 83xx/gpio: use new line value setter callbacks
      powerpc: 44x/gpio: use new line value setter callbacks
      powerpc: 52xx/gpio: use new line value setter callbacks
      powerpc: 8xx/gpio: use new line value setter callbacks

 arch/powerpc/platforms/44x/gpio.c              |  7 ++++---
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c      |  6 ++++--
 arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c | 13 ++++++++-----
 arch/powerpc/platforms/8xx/cpm1.c              | 12 ++++++++----
 arch/powerpc/sysdev/cpm_common.c               |  6 ++++--
 5 files changed, 28 insertions(+), 16 deletions(-)
---
base-commit: 8a2d53ce3c5f82683ad3df9a9a55822816fe64e7
change-id: 20250326-gpiochip-set-rv-powerpc-1e98d28222aa

Best regards,
-- 
Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

[PATCH v2 1/5] powerpc: sysdev/gpio: use new line value setter callbacks

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 arch/powerpc/sysdev/cpm_common.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
index 47db732981a8b..e22fc638dbc7c 100644
--- a/arch/powerpc/sysdev/cpm_common.c
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -138,7 +138,7 @@ static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask,
 	out_be32(&iop->dat, cpm2_gc->cpdata);
 }
 
-static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
+static int cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
 	struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc);
 	struct cpm2_gpio32_chip *cpm2_gc = gpiochip_get_data(gc);
@@ -150,6 +150,8 @@ static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 	__cpm2_gpio32_set(mm_gc, pin_mask, value);
 
 	spin_unlock_irqrestore(&cpm2_gc->lock, flags);
+
+	return 0;
 }
 
 static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
@@ -208,7 +210,7 @@ int cpm2_gpiochip_add32(struct device *dev)
 	gc->direction_input = cpm2_gpio32_dir_in;
 	gc->direction_output = cpm2_gpio32_dir_out;
 	gc->get = cpm2_gpio32_get;
-	gc->set = cpm2_gpio32_set;
+	gc->set_rv = cpm2_gpio32_set;
 	gc->parent = dev;
 	gc->owner = THIS_MODULE;
 

-- 
2.45.2

[PATCH v2 2/5] powerpc: 83xx/gpio: use new line value setter callbacks

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
index 4d8fa9ed1a678..6e37dfc6c5c9e 100644
--- a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
+++ b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
@@ -92,10 +92,11 @@ static void mcu_power_off(void)
 	mutex_unlock(&mcu->lock);
 }
 
-static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+static int mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct mcu *mcu = gpiochip_get_data(gc);
 	u8 bit = 1 << (4 + gpio);
+	int ret;
 
 	mutex_lock(&mcu->lock);
 	if (val)
@@ -103,14 +104,16 @@ static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	else
 		mcu->reg_ctrl |= bit;
 
-	i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl);
+	ret = i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
+					mcu->reg_ctrl);
 	mutex_unlock(&mcu->lock);
+
+	return ret;
 }
 
 static int mcu_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
 {
-	mcu_gpio_set(gc, gpio, val);
-	return 0;
+	return mcu_gpio_set(gc, gpio, val);
 }
 
 static int mcu_gpiochip_add(struct mcu *mcu)
@@ -123,7 +126,7 @@ static int mcu_gpiochip_add(struct mcu *mcu)
 	gc->can_sleep = 1;
 	gc->ngpio = MCU_NUM_GPIO;
 	gc->base = -1;
-	gc->set = mcu_gpio_set;
+	gc->set_rv = mcu_gpio_set;
 	gc->direction_output = mcu_gpio_dir_out;
 	gc->parent = dev;
 

-- 
2.45.2

Re: [PATCH v2 2/5] powerpc: 83xx/gpio: use new line value setter callbacks

[Christophe Leroy]

Le 02/05/2025 à 10:59, Bartosz Golaszewski a écrit :
> From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
> 
> struct gpio_chip now has callbacks for setting line values that return
> an integer, allowing to indicate failures. Convert the driver to using
> them.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>

> ---
>   arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c | 13 ++++++++-----
>   1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
> index 4d8fa9ed1a678..6e37dfc6c5c9e 100644
> --- a/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
> +++ b/arch/powerpc/platforms/83xx/mcu_mpc8349emitx.c
> @@ -92,10 +92,11 @@ static void mcu_power_off(void)
>   	mutex_unlock(&mcu->lock);
>   }
>   
> -static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
> +static int mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
>   {
>   	struct mcu *mcu = gpiochip_get_data(gc);
>   	u8 bit = 1 << (4 + gpio);
> +	int ret;
>   
>   	mutex_lock(&mcu->lock);
>   	if (val)
> @@ -103,14 +104,16 @@ static void mcu_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
>   	else
>   		mcu->reg_ctrl |= bit;
>   
> -	i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL, mcu->reg_ctrl);
> +	ret = i2c_smbus_write_byte_data(mcu->client, MCU_REG_CTRL,
> +					mcu->reg_ctrl);
>   	mutex_unlock(&mcu->lock);
> +
> +	return ret;
>   }
>   
>   static int mcu_gpio_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
>   {
> -	mcu_gpio_set(gc, gpio, val);
> -	return 0;
> +	return mcu_gpio_set(gc, gpio, val);
>   }
>   
>   static int mcu_gpiochip_add(struct mcu *mcu)
> @@ -123,7 +126,7 @@ static int mcu_gpiochip_add(struct mcu *mcu)
>   	gc->can_sleep = 1;
>   	gc->ngpio = MCU_NUM_GPIO;
>   	gc->base = -1;
> -	gc->set = mcu_gpio_set;
> +	gc->set_rv = mcu_gpio_set;
>   	gc->direction_output = mcu_gpio_dir_out;
>   	gc->parent = dev;
>   
> 

[PATCH v2 3/5] powerpc: 44x/gpio: use new line value setter callbacks

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 arch/powerpc/platforms/44x/gpio.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/44x/gpio.c b/arch/powerpc/platforms/44x/gpio.c
index e5f2319e5cbe2..d540e261d85aa 100644
--- a/arch/powerpc/platforms/44x/gpio.c
+++ b/arch/powerpc/platforms/44x/gpio.c
@@ -75,8 +75,7 @@ __ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 		clrbits32(&regs->or, GPIO_MASK(gpio));
 }
 
-static void
-ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
+static int ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 {
 	struct ppc4xx_gpio_chip *chip = gpiochip_get_data(gc);
 	unsigned long flags;
@@ -88,6 +87,8 @@ ppc4xx_gpio_set(struct gpio_chip *gc, unsigned int gpio, int val)
 	spin_unlock_irqrestore(&chip->lock, flags);
 
 	pr_debug("%s: gpio: %d val: %d\n", __func__, gpio, val);
+
+	return 0;
 }
 
 static int ppc4xx_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
@@ -179,7 +180,7 @@ static int __init ppc4xx_add_gpiochips(void)
 		gc->direction_input = ppc4xx_gpio_dir_in;
 		gc->direction_output = ppc4xx_gpio_dir_out;
 		gc->get = ppc4xx_gpio_get;
-		gc->set = ppc4xx_gpio_set;
+		gc->set_rv = ppc4xx_gpio_set;
 
 		ret = of_mm_gpiochip_add_data(np, mm_gc, ppc4xx_gc);
 		if (ret)

-- 
2.45.2

[PATCH v2 4/5] powerpc: 52xx/gpio: use new line value setter callbacks

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 arch/powerpc/platforms/52xx/mpc52xx_gpt.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
index 1ea591ec60833..c96af6b0eab42 100644
--- a/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
+++ b/arch/powerpc/platforms/52xx/mpc52xx_gpt.c
@@ -280,7 +280,7 @@ static int mpc52xx_gpt_gpio_get(struct gpio_chip *gc, unsigned int gpio)
 	return (in_be32(&gpt->regs->status) >> 8) & 1;
 }
 
-static void
+static int
 mpc52xx_gpt_gpio_set(struct gpio_chip *gc, unsigned int gpio, int v)
 {
 	struct mpc52xx_gpt_priv *gpt = gpiochip_get_data(gc);
@@ -293,6 +293,8 @@ mpc52xx_gpt_gpio_set(struct gpio_chip *gc, unsigned int gpio, int v)
 	raw_spin_lock_irqsave(&gpt->lock, flags);
 	clrsetbits_be32(&gpt->regs->mode, MPC52xx_GPT_MODE_GPIO_MASK, r);
 	raw_spin_unlock_irqrestore(&gpt->lock, flags);
+
+	return 0;
 }
 
 static int mpc52xx_gpt_gpio_dir_in(struct gpio_chip *gc, unsigned int gpio)
@@ -334,7 +336,7 @@ static void mpc52xx_gpt_gpio_setup(struct mpc52xx_gpt_priv *gpt)
 	gpt->gc.direction_input  = mpc52xx_gpt_gpio_dir_in;
 	gpt->gc.direction_output = mpc52xx_gpt_gpio_dir_out;
 	gpt->gc.get = mpc52xx_gpt_gpio_get;
-	gpt->gc.set = mpc52xx_gpt_gpio_set;
+	gpt->gc.set_rv = mpc52xx_gpt_gpio_set;
 	gpt->gc.base = -1;
 	gpt->gc.parent = gpt->dev;
 

-- 
2.45.2

[PATCH v2 5/5] powerpc: 8xx/gpio: use new line value setter callbacks

[Bartosz Golaszewski]

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu> # powerpc 8xx
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
---
 arch/powerpc/platforms/8xx/cpm1.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/platforms/8xx/cpm1.c b/arch/powerpc/platforms/8xx/cpm1.c
index 1dc095ad48fcf..7462c221115cb 100644
--- a/arch/powerpc/platforms/8xx/cpm1.c
+++ b/arch/powerpc/platforms/8xx/cpm1.c
@@ -417,7 +417,7 @@ static void __cpm1_gpio16_set(struct cpm1_gpio16_chip *cpm1_gc, u16 pin_mask, in
 	out_be16(&iop->dat, cpm1_gc->cpdata);
 }
 
-static void cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
+static int cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
 	struct cpm1_gpio16_chip *cpm1_gc = gpiochip_get_data(gc);
 	unsigned long flags;
@@ -428,6 +428,8 @@ static void cpm1_gpio16_set(struct gpio_chip *gc, unsigned int gpio, int value)
 	__cpm1_gpio16_set(cpm1_gc, pin_mask, value);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
+
+	return 0;
 }
 
 static int cpm1_gpio16_to_irq(struct gpio_chip *gc, unsigned int gpio)
@@ -497,7 +499,7 @@ int cpm1_gpiochip_add16(struct device *dev)
 	gc->direction_input = cpm1_gpio16_dir_in;
 	gc->direction_output = cpm1_gpio16_dir_out;
 	gc->get = cpm1_gpio16_get;
-	gc->set = cpm1_gpio16_set;
+	gc->set_rv = cpm1_gpio16_set;
 	gc->to_irq = cpm1_gpio16_to_irq;
 	gc->parent = dev;
 	gc->owner = THIS_MODULE;
@@ -554,7 +556,7 @@ static void __cpm1_gpio32_set(struct cpm1_gpio32_chip *cpm1_gc, u32 pin_mask, in
 	out_be32(&iop->dat, cpm1_gc->cpdata);
 }
 
-static void cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
+static int cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 {
 	struct cpm1_gpio32_chip *cpm1_gc = gpiochip_get_data(gc);
 	unsigned long flags;
@@ -565,6 +567,8 @@ static void cpm1_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value)
 	__cpm1_gpio32_set(cpm1_gc, pin_mask, value);
 
 	spin_unlock_irqrestore(&cpm1_gc->lock, flags);
+
+	return 0;
 }
 
 static int cpm1_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val)
@@ -618,7 +622,7 @@ int cpm1_gpiochip_add32(struct device *dev)
 	gc->direction_input = cpm1_gpio32_dir_in;
 	gc->direction_output = cpm1_gpio32_dir_out;
 	gc->get = cpm1_gpio32_get;
-	gc->set = cpm1_gpio32_set;
+	gc->set_rv = cpm1_gpio32_set;
 	gc->parent = dev;
 	gc->owner = THIS_MODULE;
 

-- 
2.45.2

Re: [PATCH v2 0/5] powerpc: convert board-file GPIO chips to using new value setters

[Linus Walleij]

On Fri, May 2, 2025 at 10:59 AM Bartosz Golaszewski <brgl@bgdev.pl> wrote:

> struct gpio_chip now has callbacks for setting line values that return
> an integer, allowing to indicate failures. We're in the process of
> converting all GPIO drivers to using the new API. This series converts
> all powerpc board-file level controllers.
>
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

The series:
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>

Yours,
Linus Walleij

Re: [PATCH v2 0/5] powerpc: convert board-file GPIO chips to using new value setters

[Madhavan Srinivasan]

On Fri, 02 May 2025 10:59:46 +0200, Bartosz Golaszewski wrote:
> struct gpio_chip now has callbacks for setting line values that return
> an integer, allowing to indicate failures. We're in the process of
> converting all GPIO drivers to using the new API. This series converts
> all powerpc board-file level controllers.
> 
> 

Applied to powerpc/next.

[1/5] powerpc: sysdev/gpio: use new line value setter callbacks
      https://git.kernel.org/powerpc/c/54ac723320fcb0fe42aaa42ea800697450b75668
[2/5] powerpc: 83xx/gpio: use new line value setter callbacks
      https://git.kernel.org/powerpc/c/077f8733252dcfa738bcf0cfbf6820b26a7ba084
[3/5] powerpc: 44x/gpio: use new line value setter callbacks
      https://git.kernel.org/powerpc/c/5effda1c36f2338178c0582c0719cba58f24b0b3
[4/5] powerpc: 52xx/gpio: use new line value setter callbacks
      https://git.kernel.org/powerpc/c/c8fb184faaa0aefa3c1b1f8b3eba873c7ec4d840
[5/5] powerpc: 8xx/gpio: use new line value setter callbacks
      https://git.kernel.org/powerpc/c/5ea6a980b5da58a8dff550dbc2c2523ea492dd14

Thanks