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SubjectRe: [PATCH v2] of: property: fw_devlink: do not link ".*,nr-gpios"
On Mon, Apr 5, 2021 at 3:26 PM Ilya Lipnitskiy
<ilya.lipnitskiy@gmail.com> wrote:
>
> [<vendor>,]nr-gpios property is used by some GPIO drivers[0] to indicate
> the number of GPIOs present on a system, not define a GPIO. nr-gpios is
> not configured by #gpio-cells and can't be parsed along with other
> "*-gpios" properties.
>
> nr-gpios without the "<vendor>," prefix is not allowed by the DT
> spec[1], so only add exception for the ",nr-gpios" suffix and let the
> error message continue being printed for non-compliant implementations.
>
> [0]: nr-gpios is referenced in Documentation/devicetree/bindings/gpio:
> - gpio-adnp.txt
> - gpio-xgene-sb.txt
> - gpio-xlp.txt
> - snps,dw-apb-gpio.yaml
>
> [1]:
> Link: https://github.com/devicetree-org/dt-schema/blob/cb53a16a1eb3e2169ce170c071e47940845ec26e/schemas/gpio/gpio-consumer.yaml#L20
>
> Fixes errors such as:
> OF: /palmbus@300000/gpio@600: could not find phandle
>
> Fixes: 7f00be96f125 ("of: property: Add device link support for interrupt-parent, dmas and -gpio(s)")
> Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
> Cc: Saravana Kannan <saravanak@google.com>
> Cc: <stable@vger.kernel.org> # 5.5.x
> ---
> drivers/of/property.c | 11 ++++++++++-
> 1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 2046ae311322..1793303e84ac 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1281,7 +1281,16 @@ 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")
> +
> +static struct device_node *parse_gpios(struct device_node *np,
> + const char *prop_name, int index)
> +{
> + if (!strcmp_suffix(prop_name, ",nr-gpios"))
> + return NULL;

Ah I somehow missed this patch. This gives a blanked exception for
vendor,nr-gpios. I'd prefer explicit exceptions for all the instances
of ",nr-gpios" we are grandfathering in. Any future additions should
be rejected. Can we do that please?

Rob, you okay with making this list more explicit?

-Saravana

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