[PATCH] soc: ti: smartreflex: Use platform_get_irq_optional() to get the interrupt

[PATCH] soc: ti: smartreflex: 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().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
Hi,

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
---
 drivers/soc/ti/smartreflex.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/soc/ti/smartreflex.c b/drivers/soc/ti/smartreflex.c
index b5b2fa538d5c..4f311e00fa46 100644
--- a/drivers/soc/ti/smartreflex.c
+++ b/drivers/soc/ti/smartreflex.c
@@ -819,7 +819,7 @@ static int omap_sr_probe(struct platform_device *pdev)
 {
 	struct omap_sr *sr_info;
 	struct omap_sr_data *pdata = pdev->dev.platform_data;
-	struct resource *mem, *irq;
+	struct resource *mem;
 	struct dentry *nvalue_dir;
 	int i, ret = 0;
 
@@ -844,7 +844,12 @@ static int omap_sr_probe(struct platform_device *pdev)
 	if (IS_ERR(sr_info->base))
 		return PTR_ERR(sr_info->base);
 
-	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	ret = platform_get_irq_optional(pdev, 0);
+	if (ret <= 0 && ret != -ENXIO)
+		return ret ? ret : -ENXIO;
+	if (ret > 0)
+		sr_info->irq = ret;
+	ret = 0;
 
 	sr_info->fck = devm_clk_get(pdev->dev.parent, "fck");
 	if (IS_ERR(sr_info->fck))
@@ -870,9 +875,6 @@ static int omap_sr_probe(struct platform_device *pdev)
 	sr_info->autocomp_active = false;
 	sr_info->ip_type = pdata->ip_type;
 
-	if (irq)
-		sr_info->irq = irq->start;
-
 	sr_set_clk_length(sr_info);
 
 	list_add(&sr_info->node, &sr_list);
-- 
2.17.1

Re: [PATCH] soc: ti: smartreflex: Use platform_get_irq_optional() to get the interrupt

[Nishanth Menon]

On 15:39-20211218, 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().
> 
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> ---
> Hi,
> 
> 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
> ---
>  drivers/soc/ti/smartreflex.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/soc/ti/smartreflex.c b/drivers/soc/ti/smartreflex.c
> index b5b2fa538d5c..4f311e00fa46 100644
> --- a/drivers/soc/ti/smartreflex.c
> +++ b/drivers/soc/ti/smartreflex.c
> @@ -819,7 +819,7 @@ static int omap_sr_probe(struct platform_device *pdev)
>  {
>  	struct omap_sr *sr_info;
>  	struct omap_sr_data *pdata = pdev->dev.platform_data;
> -	struct resource *mem, *irq;
> +	struct resource *mem;
>  	struct dentry *nvalue_dir;
>  	int i, ret = 0;
>  
> @@ -844,7 +844,12 @@ static int omap_sr_probe(struct platform_device *pdev)
>  	if (IS_ERR(sr_info->base))
>  		return PTR_ERR(sr_info->base);
>  
> -	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> +	ret = platform_get_irq_optional(pdev, 0);
> +	if (ret <= 0 && ret != -ENXIO)
> +		return ret ? ret : -ENXIO;
^^ minor: This is a better check compared to what existed, might be good
to add that to commit message, also does this cause the driver to fail
probe silently?

> +	if (ret > 0)
> +		sr_info->irq = ret;
> +	ret = 0;
>  
>  	sr_info->fck = devm_clk_get(pdev->dev.parent, "fck");
>  	if (IS_ERR(sr_info->fck))
> @@ -870,9 +875,6 @@ static int omap_sr_probe(struct platform_device *pdev)
>  	sr_info->autocomp_active = false;
>  	sr_info->ip_type = pdata->ip_type;
>  
> -	if (irq)
> -		sr_info->irq = irq->start;
> -
>  	sr_set_clk_length(sr_info);
>  
>  	list_add(&sr_info->node, &sr_list);
> -- 
> 2.17.1
> 

Otherwise, looks fine to me. but it is a little late since I have sent out my
5.17 PR. We can try for rc OR 5.18.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D)/Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D

Re: [PATCH] soc: ti: smartreflex: Use platform_get_irq_optional() to get the interrupt

[Lad, Prabhakar]

Hi Nishanth,

Thank you for the review.

On Mon, Dec 20, 2021 at 1:31 PM Nishanth Menon <nm@ti.com> wrote:
>
> On 15:39-20211218, 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().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
> > ---
> > Hi,
> >
> > 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
> > ---
> >  drivers/soc/ti/smartreflex.c | 12 +++++++-----
> >  1 file changed, 7 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/soc/ti/smartreflex.c b/drivers/soc/ti/smartreflex.c
> > index b5b2fa538d5c..4f311e00fa46 100644
> > --- a/drivers/soc/ti/smartreflex.c
> > +++ b/drivers/soc/ti/smartreflex.c
> > @@ -819,7 +819,7 @@ static int omap_sr_probe(struct platform_device *pdev)
> >  {
> >       struct omap_sr *sr_info;
> >       struct omap_sr_data *pdata = pdev->dev.platform_data;
> > -     struct resource *mem, *irq;
> > +     struct resource *mem;
> >       struct dentry *nvalue_dir;
> >       int i, ret = 0;
> >
> > @@ -844,7 +844,12 @@ static int omap_sr_probe(struct platform_device *pdev)
> >       if (IS_ERR(sr_info->base))
> >               return PTR_ERR(sr_info->base);
> >
> > -     irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > +     ret = platform_get_irq_optional(pdev, 0);
> > +     if (ret <= 0 && ret != -ENXIO)
> > +             return ret ? ret : -ENXIO;
> ^^ minor: This is a better check compared to what existed, might be good
> to add that to commit message, also does this cause the driver to fail
> probe silently?
>
Yes, the probe will fail silently in case of error while getting an
interrupt if it exists in DT. Do you want me to add an error message
in case of an error? I'll be sending v2 anyway dropping the check for
IRQ0.

> > +     if (ret > 0)
> > +             sr_info->irq = ret;
> > +     ret = 0;
> >
> >       sr_info->fck = devm_clk_get(pdev->dev.parent, "fck");
> >       if (IS_ERR(sr_info->fck))
> > @@ -870,9 +875,6 @@ static int omap_sr_probe(struct platform_device *pdev)
> >       sr_info->autocomp_active = false;
> >       sr_info->ip_type = pdata->ip_type;
> >
> > -     if (irq)
> > -             sr_info->irq = irq->start;
> > -
> >       sr_set_clk_length(sr_info);
> >
> >       list_add(&sr_info->node, &sr_list);
> > --
> > 2.17.1
> >
>
> Otherwise, looks fine to me. but it is a little late since I have sent out my
> 5.17 PR. We can try for rc OR 5.18.
>
rc should be OK, as there will be tree wide changes.

Cheers,
Prabhakar

Re: [PATCH] soc: ti: smartreflex: Use platform_get_irq_optional() to get the interrupt

[Nishanth Menon]

On 19:28-20211221, Lad, Prabhakar wrote:
[...]
> Yes, the probe will fail silently in case of error while getting an
> interrupt if it exists in DT. Do you want me to add an error message
> in case of an error? I'll be sending v2 anyway dropping the check for
> IRQ0.

Yes please, please add an error message.

[...]
> rc should be OK, as there will be tree wide changes.

Lets try and do that (hopefully we should have a new respin by rc1).

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D)/Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D