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of: property: fw_devlink: do not link ".*,nr-gpios"

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commit d473d32c2f upstream.

[<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: cb53a16a1e/schemas/gpio/gpio-consumer.yaml (L20)

Fixes errors such as:
  OF: /palmbus@300000/gpio@600: could not find phandle

Fixes: 7f00be96f1 ("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 # v5.5+
Link: https://lore.kernel.org/r/20210405222540.18145-1-ilya.lipnitskiy@gmail.com
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilya Lipnitskiy
2021-04-05 15:25:40 -07:00
committed by Greg Kroah-Hartman
parent 009c566527
commit 9b54dad28d
1 changed files with 10 additions and 1 deletions
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11
drivers/of/property.c
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@@ -1308,7 +1308,16 @@ 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;
return parse_suffix_prop_cells(np, prop_name, index, "-gpios",
"#gpio-cells");
}
static struct device_node *parse_iommu_maps(struct device_node *np,
const char *prop_name, int index)