[PATCH v2 0/3] i2c/busses: Use platform_get_irq/_optional() variants to fetch IRQ's

[PATCH v2 0/3] i2c/busses: Use platform_get_irq/_optional() 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 (3):
  i2c: bcm2835: Use platform_get_irq() to get the interrupt
  i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt
  i2c: riic: Use platform_get_irq() to get the interrupt

 drivers/i2c/busses/i2c-bcm2835.c   | 11 ++++------
 drivers/i2c/busses/i2c-riic.c      | 10 ++++-----
 drivers/i2c/busses/i2c-sh_mobile.c | 34 +++++++++++++++++++++++-------
 3 files changed, 35 insertions(+), 20 deletions(-)

-- 
2.17.1

[PATCH v2 0/3] i2c/busses: Use platform_get_irq/_optional() 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 (3):
  i2c: bcm2835: Use platform_get_irq() to get the interrupt
  i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt
  i2c: riic: Use platform_get_irq() to get the interrupt

 drivers/i2c/busses/i2c-bcm2835.c   | 11 ++++------
 drivers/i2c/busses/i2c-riic.c      | 10 ++++-----
 drivers/i2c/busses/i2c-sh_mobile.c | 34 +++++++++++++++++++++++-------
 3 files changed, 35 insertions(+), 20 deletions(-)

-- 
2.17.1


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[PATCH v2 1/3] i2c: bcm2835: 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 bypasses the hierarchical setup and messes 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>
---
v1->v2
* Dropped IRQ0 check
---
 drivers/i2c/busses/i2c-bcm2835.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 37443edbf754..dfc534065595 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -402,7 +402,7 @@ static const struct i2c_adapter_quirks bcm2835_i2c_quirks = {
 static int bcm2835_i2c_probe(struct platform_device *pdev)
 {
 	struct bcm2835_i2c_dev *i2c_dev;
-	struct resource *mem, *irq;
+	struct resource *mem;
 	int ret;
 	struct i2c_adapter *adap;
 	struct clk *mclk;
@@ -452,12 +452,9 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
-		return -ENODEV;
-	}
-	i2c_dev->irq = irq->start;
+	i2c_dev->irq = platform_get_irq(pdev, 0);
+	if (i2c_dev->irq < 0)
+		return i2c_dev->irq;
 
 	ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,
 			  dev_name(&pdev->dev), i2c_dev);
-- 
2.17.1

[PATCH v2 1/3] i2c: bcm2835: 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 bypasses the hierarchical setup and messes 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>
---
v1->v2
* Dropped IRQ0 check
---
 drivers/i2c/busses/i2c-bcm2835.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
index 37443edbf754..dfc534065595 100644
--- a/drivers/i2c/busses/i2c-bcm2835.c
+++ b/drivers/i2c/busses/i2c-bcm2835.c
@@ -402,7 +402,7 @@ static const struct i2c_adapter_quirks bcm2835_i2c_quirks = {
 static int bcm2835_i2c_probe(struct platform_device *pdev)
 {
 	struct bcm2835_i2c_dev *i2c_dev;
-	struct resource *mem, *irq;
+	struct resource *mem;
 	int ret;
 	struct i2c_adapter *adap;
 	struct clk *mclk;
@@ -452,12 +452,9 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!irq) {
-		dev_err(&pdev->dev, "No IRQ resource\n");
-		return -ENODEV;
-	}
-	i2c_dev->irq = irq->start;
+	i2c_dev->irq = platform_get_irq(pdev, 0);
+	if (i2c_dev->irq < 0)
+		return i2c_dev->irq;
 
 	ret = request_irq(i2c_dev->irq, bcm2835_i2c_isr, IRQF_SHARED,
 			  dev_name(&pdev->dev), i2c_dev);
-- 
2.17.1


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Re: [PATCH v2 1/3] i2c: bcm2835: Use platform_get_irq() to get the interrupt

[Florian Fainelli]

On 12/21/21 9:53 AM, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

Re: [PATCH v2 1/3] i2c: bcm2835: Use platform_get_irq() to get the interrupt

[Florian Fainelli]

On 12/21/21 9:53 AM, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
-- 
Florian

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Re: [PATCH v2 1/3] i2c: bcm2835: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:20PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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 to for-next, thanks!


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Re: [PATCH v2 1/3] i2c: bcm2835: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:20PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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 to for-next, thanks!


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[PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() 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 bypasses the hierarchical setup and messes up the
irq chaining.

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

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v1->v2
* Dropped IRQ0 check
* Simplified code
---
 drivers/i2c/busses/i2c-sh_mobile.c | 34 +++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 7b8caf172851..9754849dbb23 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -830,20 +830,38 @@ static void sh_mobile_i2c_release_dma(struct sh_mobile_i2c_data *pd)
 
 static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, struct sh_mobile_i2c_data *pd)
 {
-	struct resource *res;
-	resource_size_t n;
+	struct device_node *np = dev_of_node(&dev->dev);
 	int k = 0, ret;
 
-	while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
-		for (n = res->start; n <= res->end; n++) {
-			ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
-					  0, dev_name(&dev->dev), pd);
+	if (np) {
+		int irq;
+
+		while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) {
+			if (irq < 0)
+				return irq;
+			ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
+					       0, dev_name(&dev->dev), pd);
 			if (ret) {
-				dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
+				dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
 				return ret;
 			}
+			k++;
+		};
+	} else {
+		struct resource *res;
+		resource_size_t n;
+
+		while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
+			for (n = res->start; n <= res->end; n++) {
+				ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
+						       0, dev_name(&dev->dev), pd);
+				if (ret) {
+					dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
+					return ret;
+				}
+			}
+			k++;
 		}
-		k++;
 	}
 
 	return k > 0 ? 0 : -ENOENT;
-- 
2.17.1

[PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() 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 bypasses the hierarchical setup and messes up the
irq chaining.

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

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
v1->v2
* Dropped IRQ0 check
* Simplified code
---
 drivers/i2c/busses/i2c-sh_mobile.c | 34 +++++++++++++++++++++++-------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 7b8caf172851..9754849dbb23 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -830,20 +830,38 @@ static void sh_mobile_i2c_release_dma(struct sh_mobile_i2c_data *pd)
 
 static int sh_mobile_i2c_hook_irqs(struct platform_device *dev, struct sh_mobile_i2c_data *pd)
 {
-	struct resource *res;
-	resource_size_t n;
+	struct device_node *np = dev_of_node(&dev->dev);
 	int k = 0, ret;
 
-	while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
-		for (n = res->start; n <= res->end; n++) {
-			ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
-					  0, dev_name(&dev->dev), pd);
+	if (np) {
+		int irq;
+
+		while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) {
+			if (irq < 0)
+				return irq;
+			ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
+					       0, dev_name(&dev->dev), pd);
 			if (ret) {
-				dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
+				dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
 				return ret;
 			}
+			k++;
+		};
+	} else {
+		struct resource *res;
+		resource_size_t n;
+
+		while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
+			for (n = res->start; n <= res->end; n++) {
+				ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
+						       0, dev_name(&dev->dev), pd);
+				if (ret) {
+					dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
+					return ret;
+				}
+			}
+			k++;
 		}
-		k++;
 	}
 
 	return k > 0 ? 0 : -ENOENT;
-- 
2.17.1


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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Geert Uytterhoeven]

On Tue, Dec 21, 2021 at 7:21 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 bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Geert Uytterhoeven]

On Tue, Dec 21, 2021 at 7:21 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 bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:21PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Tested on a Renesas R-Car Gen3 SoC (M3-W) and IIC port still works and
no false positive printouts in the kernel log:

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:21PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Tested on a Renesas R-Car Gen3 SoC (M3-W) and IIC port still works and
no false positive printouts in the kernel log:

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Andy Shevchenko]

On Wed, Dec 22, 2021 at 2:41 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 bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.

...

> +       if (np) {

Same comments as per your other patches, i.e.
Why is this check here?

> +               int irq;
> +
> +               while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) {

Consider 0 as no IRQ.

> +                       if (irq < 0)
> +                               return irq;
> +                       ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> +                                              0, dev_name(&dev->dev), pd);
>                         if (ret) {
> -                               dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +                               dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
>                                 return ret;
>                         }
> +                       k++;
> +               };
> +       } else {
> +               struct resource *res;
> +               resource_size_t n;
> +
> +               while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> +                       for (n = res->start; n <= res->end; n++) {
> +                               ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> +                                                      0, dev_name(&dev->dev), pd);
> +                               if (ret) {
> +                                       dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +                                       return ret;
> +                               }
> +                       }
> +                       k++;
>                 }
> -               k++;
>         }

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Andy Shevchenko]

On Wed, Dec 22, 2021 at 2:41 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 bypasses the hierarchical setup and messes up the
> irq chaining.
>
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.

...

> +       if (np) {

Same comments as per your other patches, i.e.
Why is this check here?

> +               int irq;
> +
> +               while ((irq = platform_get_irq_optional(dev, k)) != -ENXIO) {

Consider 0 as no IRQ.

> +                       if (irq < 0)
> +                               return irq;
> +                       ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> +                                              0, dev_name(&dev->dev), pd);
>                         if (ret) {
> -                               dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +                               dev_err(&dev->dev, "cannot request IRQ %d\n", irq);
>                                 return ret;
>                         }
> +                       k++;
> +               };
> +       } else {
> +               struct resource *res;
> +               resource_size_t n;
> +
> +               while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> +                       for (n = res->start; n <= res->end; n++) {
> +                               ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> +                                                      0, dev_name(&dev->dev), pd);
> +                               if (ret) {
> +                                       dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> +                                       return ret;
> +                               }
> +                       }
> +                       k++;
>                 }
> -               k++;
>         }

-- 
With Best Regards,
Andy Shevchenko

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RE: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Prabhakar Mahadev Lad]

Hi Andy,

Thank you for the review.

> -----Original Message-----
> From: Andy Shevchenko <andy.shevchenko@gmail.com>
> Sent: 25 December 2021 17:49
> To: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Cc: Florian Fainelli <f.fainelli@gmail.com>; Ray Jui <rjui@broadcom.com>; Scott Branden
> <sbranden@broadcom.com>; bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>; Nicolas
> Saenz Julienne <nsaenz@kernel.org>; Chris Brandt <Chris.Brandt@renesas.com>; Wolfram Sang
> <wsa+renesas@sang-engineering.com>; linux-i2c <linux-i2c@vger.kernel.org>; linux-rpi-kernel <linux-
> rpi-kernel@lists.infradead.org>; linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>; Linux-
> Renesas <linux-renesas-soc@vger.kernel.org>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>;
> Prabhakarprabhakar.csengg@gmail.com
> Subject: Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt
> 
> On Wed, Dec 22, 2021 at 2:41 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 bypasses the hierarchical setup and messes up the irq
> > chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT
> > core code use platform_get_irq_optional() for DT users only.
> 
> ...
> 
> > +       if (np) {
> 
> Same comments as per your other patches, i.e.
> Why is this check here?
> 
Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.

> > +               int irq;
> > +
> > +               while ((irq = platform_get_irq_optional(dev, k)) !=
> > + -ENXIO) {
> 
> Consider 0 as no IRQ.
> 
OK.

[0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454

Cheers,
Prabhakar

> > +                       if (irq < 0)
> > +                               return irq;
> > +                       ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> > +                                              0, dev_name(&dev->dev),
> > + pd);
> >                         if (ret) {
> > -                               dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                               dev_err(&dev->dev, "cannot request IRQ
> > + %d\n", irq);
> >                                 return ret;
> >                         }
> > +                       k++;
> > +               };
> > +       } else {
> > +               struct resource *res;
> > +               resource_size_t n;
> > +
> > +               while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> > +                       for (n = res->start; n <= res->end; n++) {
> > +                               ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> > +                                                      0, dev_name(&dev->dev), pd);
> > +                               if (ret) {
> > +                                       dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                                       return ret;
> > +                               }
> > +                       }
> > +                       k++;
> >                 }
> > -               k++;
> >         }
> 
> --
> With Best Regards,
> Andy Shevchenko

RE: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Prabhakar Mahadev Lad]

Hi Andy,

Thank you for the review.

> -----Original Message-----
> From: Andy Shevchenko <andy.shevchenko@gmail.com>
> Sent: 25 December 2021 17:49
> To: Prabhakar Mahadev Lad <prabhakar.mahadev-lad.rj@bp.renesas.com>
> Cc: Florian Fainelli <f.fainelli@gmail.com>; Ray Jui <rjui@broadcom.com>; Scott Branden
> <sbranden@broadcom.com>; bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>; Nicolas
> Saenz Julienne <nsaenz@kernel.org>; Chris Brandt <Chris.Brandt@renesas.com>; Wolfram Sang
> <wsa+renesas@sang-engineering.com>; linux-i2c <linux-i2c@vger.kernel.org>; linux-rpi-kernel <linux-
> rpi-kernel@lists.infradead.org>; linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>; Linux-
> Renesas <linux-renesas-soc@vger.kernel.org>; Linux Kernel Mailing List <linux-kernel@vger.kernel.org>;
> Prabhakarprabhakar.csengg@gmail.com
> Subject: Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt
> 
> On Wed, Dec 22, 2021 at 2:41 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 bypasses the hierarchical setup and messes up the irq
> > chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT
> > core code use platform_get_irq_optional() for DT users only.
> 
> ...
> 
> > +       if (np) {
> 
> Same comments as per your other patches, i.e.
> Why is this check here?
> 
Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.

> > +               int irq;
> > +
> > +               while ((irq = platform_get_irq_optional(dev, k)) !=
> > + -ENXIO) {
> 
> Consider 0 as no IRQ.
> 
OK.

[0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454

Cheers,
Prabhakar

> > +                       if (irq < 0)
> > +                               return irq;
> > +                       ret = devm_request_irq(&dev->dev, irq, sh_mobile_i2c_isr,
> > +                                              0, dev_name(&dev->dev),
> > + pd);
> >                         if (ret) {
> > -                               dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                               dev_err(&dev->dev, "cannot request IRQ
> > + %d\n", irq);
> >                                 return ret;
> >                         }
> > +                       k++;
> > +               };
> > +       } else {
> > +               struct resource *res;
> > +               resource_size_t n;
> > +
> > +               while ((res = platform_get_resource(dev, IORESOURCE_IRQ, k))) {
> > +                       for (n = res->start; n <= res->end; n++) {
> > +                               ret = devm_request_irq(&dev->dev, n, sh_mobile_i2c_isr,
> > +                                                      0, dev_name(&dev->dev), pd);
> > +                               if (ret) {
> > +                                       dev_err(&dev->dev, "cannot request IRQ %pa\n", &n);
> > +                                       return ret;
> > +                               }
> > +                       }
> > +                       k++;
> >                 }
> > -               k++;
> >         }
> 
> --
> With Best Regards,
> Andy Shevchenko
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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Andy Shevchenko]

On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:

...

> > > +       if (np) {
> >
> > Same comments as per your other patches, i.e.
> > Why is this check here?
> >
> Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.

Shouldn't be fixed in platform_get_irq_optional() to return IRQ by
index for all cases?

> [0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454


-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Andy Shevchenko]

On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad
<prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:

...

> > > +       if (np) {
> >
> > Same comments as per your other patches, i.e.
> > Why is this check here?
> >
> Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.

Shouldn't be fixed in platform_get_irq_optional() to return IRQ by
index for all cases?

> [0] https://elixir.bootlin.com/linux/v5.16-rc6/source/arch/sh/kernel/cpu/sh4a/setup-sh7724.c#L454


-- 
With Best Regards,
Andy Shevchenko

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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Lad, Prabhakar]

On Sun, Dec 26, 2021 at 8:41 AM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad
> <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
>
> ...
>
> > > > +       if (np) {
> > >
> > > Same comments as per your other patches, i.e.
> > > Why is this check here?
> > >
> > Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.
>
> Shouldn't be fixed in platform_get_irq_optional() to return IRQ by
> index for all cases?
>
Sorry, I don't get you here. Wasn't your earlier comment for np check?

Cheers,
Prabhakar

Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Lad, Prabhakar]

On Sun, Dec 26, 2021 at 8:41 AM Andy Shevchenko
<andy.shevchenko@gmail.com> wrote:
>
> On Sun, Dec 26, 2021 at 1:45 AM Prabhakar Mahadev Lad
> <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
> > > On Wed, Dec 22, 2021 at 2:41 PM Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> wrote:
>
> ...
>
> > > > +       if (np) {
> > >
> > > Same comments as per your other patches, i.e.
> > > Why is this check here?
> > >
> > Because the interrupt resource has range of interrupts in one IRQ resource [0]. Let me know if there is any other alternative way to avoid such case.
>
> Shouldn't be fixed in platform_get_irq_optional() to return IRQ by
> index for all cases?
>
Sorry, I don't get you here. Wasn't your earlier comment for np check?

Cheers,
Prabhakar

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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 614 bytes --]

On Tue, Dec 21, 2021 at 05:53:21PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Applied to for-next, thanks!


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Re: [PATCH v2 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to get the interrupt

[Wolfram Sang]

[-- Attachment #1.1: Type: text/plain, Size: 614 bytes --]

On Tue, Dec 21, 2021 at 05:53:21PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes up the
> irq chaining.
> 
> In preparation for removal of static setup of IRQ resource from DT core
> code use platform_get_irq_optional() for DT users only.
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Applied to for-next, thanks!


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[PATCH v2 3/3] i2c: riic: 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 bypasses the hierarchical setup and messes 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>
---
v1->v2
* Dropped IRQ0 check
---
 drivers/i2c/busses/i2c-riic.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 78b84445ee6a..8dfd27dc6149 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -433,12 +433,12 @@ static int riic_i2c_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);
-		if (!res)
-			return -ENODEV;
+		ret = platform_get_irq(pdev, riic_irqs[i].res_num);
+		if (ret < 0)
+			return ret;
 
-		ret = devm_request_irq(&pdev->dev, res->start, riic_irqs[i].isr,
-					0, riic_irqs[i].name, riic);
+		ret = devm_request_irq(&pdev->dev, ret, riic_irqs[i].isr,
+				       0, riic_irqs[i].name, riic);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
 			return ret;
-- 
2.17.1

[PATCH v2 3/3] i2c: riic: 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 bypasses the hierarchical setup and messes 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>
---
v1->v2
* Dropped IRQ0 check
---
 drivers/i2c/busses/i2c-riic.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 78b84445ee6a..8dfd27dc6149 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -433,12 +433,12 @@ static int riic_i2c_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);
-		if (!res)
-			return -ENODEV;
+		ret = platform_get_irq(pdev, riic_irqs[i].res_num);
+		if (ret < 0)
+			return ret;
 
-		ret = devm_request_irq(&pdev->dev, res->start, riic_irqs[i].isr,
-					0, riic_irqs[i].name, riic);
+		ret = devm_request_irq(&pdev->dev, ret, riic_irqs[i].isr,
+				       0, riic_irqs[i].name, riic);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
 			return ret;
-- 
2.17.1


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Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

[-- Attachment #1: Type: text/plain, Size: 619 bytes --]

On Tue, Dec 21, 2021 at 05:53:22PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

[-- Attachment #1.1: Type: text/plain, Size: 619 bytes --]

On Tue, Dec 21, 2021 at 05:53:22PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>


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Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Geert Uytterhoeven]

On Tue, Dec 21, 2021 at 7:25 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Geert Uytterhoeven]

On Tue, Dec 21, 2021 at 7:25 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 bypasses the hierarchical setup and messes 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>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds

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Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:22PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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 to for-next, thanks!


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Re: [PATCH v2 3/3] i2c: riic: Use platform_get_irq() to get the interrupt

[Wolfram Sang]

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On Tue, Dec 21, 2021 at 05:53:22PM +0000, Lad Prabhakar 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 bypasses the hierarchical setup and messes 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 to for-next, thanks!


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