linux-kernel - Re: [PATCH V4 04/10] dt-bindings: timestamp: Add nvidia,gpio-controller

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Date:   Thu, 23 Mar 2023 08:58:37 -0500
From:   Rob Herring <robh@...nel.org>
To:     Dipen Patel <dipenp@...dia.com>
Cc:     brgl@...ev.pl, devicetree@...r.kernel.org,
        timestamp@...ts.linux.dev, linux-doc@...r.kernel.org,
        corbet@....net, jonathanh@...dia.com,
        krzysztof.kozlowski+dt@...aro.org, gregkh@...uxfoundation.org,
        linux-gpio@...r.kernel.org, robh+dt@...nel.org,
        thierry.reding@...il.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, linus.walleij@...aro.org
Subject: Re: [PATCH V4 04/10] dt-bindings: timestamp: Add
 nvidia,gpio-controller


On Wed, 22 Mar 2023 18:29:23 -0700, Dipen Patel wrote:
> Introducing nvidia,gpio-controller property from Tegra234 SoCs onwards.
> This is done to help below case.
> 
> Without this property code would look like:
> if (of_device_is_compatible(dev->of_node, "nvidia,tegra194-gte-aon"))
> 	hte_dev->c = gpiochip_find("tegra194-gpio-aon",
> 				   tegra_get_gpiochip_from_name);
> else if (of_device_is_compatible(dev->of_node, "nvidia,tegra234-gte-aon"))
> 	hte_dev->c = gpiochip_find("tegra234-gpio-aon",
> 				   tegra_get_gpiochip_from_name);
> else
> 	return -ENODEV;
> 
> This means for every future addition of the compatible string, if else
> condition statements have to be expanded.
> 
> With the property:
> gpio_ctrl = of_parse_phandle(dev->of_node, "nvidia,gpio-controller", 0);
> ....
> hte_dev->c = gpiochip_find(gpio_ctrl, tegra_get_gpiochip_from_of_node);
> 
> This simplifies the code significantly. The introdunction of this
> property/binding does not break existing Tegra194 provider driver.
> 
> Signed-off-by: Dipen Patel <dipenp@...dia.com>
> ---
>  .../timestamp/nvidia,tegra194-hte.yaml        | 31 +++++++++++++++++--
>  1 file changed, 29 insertions(+), 2 deletions(-)
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.example.dtb: timestamp@...0000: reg: [[0, 203292672], [0, 65536]] is too long
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.example.dtb: timestamp@...0000: reg: [[0, 203292672], [0, 65536]] is too long
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.example.dtb: timestamp@...0000: reg: [[0, 61472768], [0, 65536]] is too long
	From schema: /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/20230323012929.10815-5-dipenp@nvidia.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.