linux-kernel - Re: [PATCH v1 2/2] of: property: Add device link support for pinctrl-0 through pinctrl-8

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Message-ID: <084158b7-f6dc-167f-b06d-db617fb2df29@gmail.com>
Date:   Wed, 22 Jul 2020 15:56:04 -0500
From:   Frank Rowand <frowand.list@...il.com>
To:     Saravana Kannan <saravanak@...gle.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     kernel-team@...roid.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 2/2] of: property: Add device link support for
 pinctrl-0 through pinctrl-8

On 2020-07-22 15:13, Saravana Kannan wrote:
> Add support for pinctrl-0 through pinctrl-8 explicitly instead of trying
> to add support for pinctrl-%d properties.
> 
> Of all the pinctrl-* properties in dts files (20322), only 47% (9531)
> are pinctrl-%d properties. Of all the pinctrl-%d properties, 99.5%
> (9486) are made up of pinctrl-[0-2].
> 
> Trying to parse all pinctrl-* properties and checking for pinctrl-%d is
> unnecessarily complicated. So, just add support for pinctrl-[0-8] for
> now. In the unlikely event we ever exceed pinctrl-8, we can come back
> and improve this.

If you were to implement the more general pinctrl-* case, roughly what would
it look like (pseudo-code or english description is fine).

-Frank

> 
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---
>  drivers/of/property.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index b06edeb1f88b..d40d923ffeaf 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1274,6 +1274,15 @@ DEFINE_SIMPLE_PROP(interrupts_extended, "interrupts-extended",
>  DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells", NULL)
>  DEFINE_SIMPLE_PROP(phys, "phys", "#phy-cells")
>  DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL)
> +DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL)
>  DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
>  DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
>  DEFINE_SUFFIX_PROP(gpios, "-gpios", "#gpio-cells")
> @@ -1303,6 +1312,15 @@ static const struct supplier_bindings of_supplier_bindings[] = {
>  	{ .parse_prop = parse_nvmem_cells, },
>  	{ .parse_prop = parse_phys, },
>  	{ .parse_prop = parse_wakeup_parent, },
> +	{ .parse_prop = parse_pinctrl0, },
> +	{ .parse_prop = parse_pinctrl1, },
> +	{ .parse_prop = parse_pinctrl2, },
> +	{ .parse_prop = parse_pinctrl3, },
> +	{ .parse_prop = parse_pinctrl4, },
> +	{ .parse_prop = parse_pinctrl5, },
> +	{ .parse_prop = parse_pinctrl6, },
> +	{ .parse_prop = parse_pinctrl7, },
> +	{ .parse_prop = parse_pinctrl8, },
>  	{ .parse_prop = parse_regulators, },
>  	{ .parse_prop = parse_gpio, },
>  	{ .parse_prop = parse_gpios, },
>