[PATCH 0/2] gpio: Use platform_get_irq*() variants to fetch IRQ's

[PATCH 0/2] gpio: Use platform_get_irq*() variants to fetch IRQ's

[Lad Prabhakar]

Hi All,

This patch series aims to drop using platform_get_resource() for IRQ types
in preparation for removal of static setup of IRQ resource from DT core
code.

Dropping usage of platform_get_resource() was agreed based on
the discussion [0].

[0] https://patchwork.kernel.org/project/linux-renesas-soc/
patch/20211209001056.29774-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

Cheers,
Prabhakar

Lad Prabhakar (2):
  gpio: ts5500: Use platform_get_irq() to get the interrupt
  gpio: rcar: Use platform_get_irq() to get the interrupt

 drivers/gpio/gpio-rcar.c   | 12 ++++--------
 drivers/gpio/gpio-ts5500.c | 11 ++++-------
 2 files changed, 8 insertions(+), 15 deletions(-)

-- 
2.17.1

[PATCH 1/2] gpio: ts5500: Use platform_get_irq() to get the interrupt

[Lad Prabhakar]

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypassed the hierarchical setup and messed up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/gpio/gpio-ts5500.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpio/gpio-ts5500.c b/drivers/gpio/gpio-ts5500.c
index c91890488402..b159e92a3612 100644
--- a/drivers/gpio/gpio-ts5500.c
+++ b/drivers/gpio/gpio-ts5500.c
@@ -317,22 +317,19 @@ static int ts5500_dio_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	const char *name = dev_name(dev);
 	struct ts5500_priv *priv;
-	struct resource *res;
 	unsigned long flags;
 	int ret;
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "missing IRQ resource\n");
-		return -EINVAL;
-	}
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
+		return ret;
 
 	priv = devm_kzalloc(dev, sizeof(struct ts5500_priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
 	platform_set_drvdata(pdev, priv);
-	priv->hwirq = res->start;
+	priv->hwirq = ret;
 	spin_lock_init(&priv->lock);
 
 	priv->gpio_chip.owner = THIS_MODULE;
-- 
2.17.1

[PATCH 2/2] gpio: rcar: Use platform_get_irq() to get the interrupt

[Lad Prabhakar]

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypassed the hierarchical setup and messed up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/gpio/gpio-rcar.c | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/drivers/gpio/gpio-rcar.c b/drivers/gpio/gpio-rcar.c
index f7b653314e7e..437baecc434e 100644
--- a/drivers/gpio/gpio-rcar.c
+++ b/drivers/gpio/gpio-rcar.c
@@ -477,7 +477,6 @@ static void gpio_rcar_enable_inputs(struct gpio_rcar_priv *p)
 static int gpio_rcar_probe(struct platform_device *pdev)
 {
 	struct gpio_rcar_priv *p;
-	struct resource *irq;
 	struct gpio_chip *gpio_chip;
 	struct irq_chip *irq_chip;
 	struct gpio_irq_chip *girq;
@@ -502,12 +501,10 @@ static int gpio_rcar_probe(struct platform_device *pdev)
 
 	pm_runtime_enable(dev);
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq) {
-		dev_err(dev, "missing IRQ\n");
-		ret = -EINVAL;
+	ret = platform_get_irq(pdev, 0);
+	if (ret < 0)
 		goto err0;
-	}
+	p->irq_parent = ret;
 
 	p->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(p->base)) {
@@ -555,8 +552,7 @@ static int gpio_rcar_probe(struct platform_device *pdev)
 		goto err0;
 	}
 
-	p->irq_parent = irq->start;
-	if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
+	if (devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler,
 			     IRQF_SHARED, name, p)) {
 		dev_err(dev, "failed to request IRQ\n");
 		ret = -ENOENT;
-- 
2.17.1

Re: [PATCH 2/2] gpio: rcar: Use platform_get_irq() to get the interrupt

[Andy Shevchenko]

On Fri, Dec 24, 2021 at 9:21 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
>
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypassed the hierarchical setup and messed up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq().

...

> -       if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
> +       if (devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler,
>                              IRQF_SHARED, name, p)) {
>                 dev_err(dev, "failed to request IRQ\n");
>                 ret = -ENOENT;

While at it, you may unshadow the error code
ret = devm_request_irq(...);
if (ret) {
  ...
}

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 2/2] gpio: rcar: Use platform_get_irq() to get the interrupt

[Lad, Prabhakar]

Hi Andy,

Thank you for the review.

On Sat, Dec 25, 2021 at 2:49 PM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Fri, Dec 24, 2021 at 9:21 PM Lad Prabhakar
> <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> >
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypassed the hierarchical setup and messed up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq().
>
> ...
>
> > -       if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler,
> > +       if (devm_request_irq(dev, p->irq_parent, gpio_rcar_irq_handler,
> >                              IRQF_SHARED, name, p)) {
> >                 dev_err(dev, "failed to request IRQ\n");
> >                 ret = -ENOENT;
>
> While at it, you may unshadow the error code
> ret = devm_request_irq(...);
> if (ret) {
>   ...
> }
>
Agreed, will do.

Cheers,
Prabhakar

Re: [PATCH 1/2] gpio: ts5500: Use platform_get_irq() to get the interrupt

[Bartosz Golaszewski]

On Wed, Dec 22, 2021 at 6:19 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
>
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypassed the hierarchical setup and messed up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq().
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
>  drivers/gpio/gpio-ts5500.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpio/gpio-ts5500.c b/drivers/gpio/gpio-ts5500.c
> index c91890488402..b159e92a3612 100644
> --- a/drivers/gpio/gpio-ts5500.c
> +++ b/drivers/gpio/gpio-ts5500.c
> @@ -317,22 +317,19 @@ static int ts5500_dio_probe(struct platform_device *pdev)
>         struct device *dev = &pdev->dev;
>         const char *name = dev_name(dev);
>         struct ts5500_priv *priv;
> -       struct resource *res;
>         unsigned long flags;
>         int ret;
>
> -       res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -       if (!res) {
> -               dev_err(dev, "missing IRQ resource\n");
> -               return -EINVAL;
> -       }
> +       ret = platform_get_irq(pdev, 0);
> +       if (ret < 0)
> +               return ret;
>
>         priv = devm_kzalloc(dev, sizeof(struct ts5500_priv), GFP_KERNEL);
>         if (!priv)
>                 return -ENOMEM;
>
>         platform_set_drvdata(pdev, priv);
> -       priv->hwirq = res->start;
> +       priv->hwirq = ret;
>         spin_lock_init(&priv->lock);
>
>         priv->gpio_chip.owner = THIS_MODULE;
> --
> 2.17.1
>

Applied, thanks!

Bart

Re: [PATCH 2/2] gpio: rcar: Use platform_get_irq() to get the interrupt

[Bartosz Golaszewski]

On Wed, Dec 22, 2021 at 6:19 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
>
> platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> allocation of IRQ resources in DT core code, this causes an issue
> when using hierarchical interrupt domains using "interrupts" property
> in the node as this bypassed the hierarchical setup and messed up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq().
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---

Applied, thanks!

Bart