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

Dipen Patel
2023-03-27T16:58:34Z

On 3/25/23 4:07 AM, Krzysztof Kozlowski wrote:
> On 23/03/2023 02:29, 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@nvidia.com>
>> ---
>> .../timestamp/nvidia,tegra194-hte.yaml | 31 +++++++++++++++++--
>> 1 file changed, 29 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml b/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
>> index eafc33e9ae2e..841273a3d8ae 100644
>> --- a/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
>> +++ b/Documentation/devicetree/bindings/timestamp/nvidia,tegra194-hte.yaml
>> @@ -51,6 +51,12 @@ properties:
>> LIC instance has 11 slices and Tegra234 LIC has 17 slices.
>> enum: [3, 11, 17]
>>
>> + nvidia,gpio-controller:
>> + $ref: /schemas/types.yaml#/definitions/phandle
>> + description:
>> + The phandle to AON gpio controller instance. This is required to handle
>> + namespace conversion between GPIO and GTE.
>> +
>> '#timestamp-cells':
>> description:
>> This represents number of line id arguments as specified by the
>> @@ -65,22 +71,43 @@ required:
>> - interrupts
>> - "#timestamp-cells"
>>
>> +allOf:
>> + - if:
>> + properties:
>> + compatible:
>> + contains:
>> + enum:
>> + - nvidia,tegra234-gte-aon
>> + then:
>> + required:
>> + - nvidia,gpio-controller
>> +
>> additionalProperties: false
>>
>> examples:
>> - |
>> tegra_hte_aon: timestamp@c1e0000 {
>> compatible = "nvidia,tegra194-gte-aon";
>> - reg = <0xc1e0000 0x10000>;
>> + reg = <0x0 0xc1e0000 0x0 0x10000>;
>
> This is not really explained in commit msg... are you sure you tested it?
I have to revert this part back in next patch as when I upgraded dtsschema it gave me errors.
>
>
> Best regards,
> Krzysztof
>