linux-kernel - Re: [PATCH 4/5] platform/chrome: cros_kbd_led

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Message-ID: <CACeCKac+b1Rp6bZFALn=sbh8gkJbWeKTC=8bdzp+-90pgq=wSw@mail.gmail.com>
Date:   Tue, 15 Feb 2022 17:10:04 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     Tzung-Bi Shih <tzungbi@...gle.com>
Cc:     bleung@...omium.org, groeck@...omium.org, robh+dt@...nel.org,
        chrome-platform@...ts.linux.dev, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] platform/chrome: cros_kbd_led_backlight: support OF match

On Sun, Feb 13, 2022 at 9:37 PM Tzung-Bi Shih <tzungbi@...gle.com> wrote:
>
> Signed-off-by: Tzung-Bi Shih <tzungbi@...gle.com>
> ---
>  .../platform/chrome/cros_kbd_led_backlight.c    | 17 +++++++++++++++--
>  1 file changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_kbd_led_backlight.c b/drivers/platform/chrome/cros_kbd_led_backlight.c
> index 814f2b74c602..ba853e55d29a 100644
> --- a/drivers/platform/chrome/cros_kbd_led_backlight.c
> +++ b/drivers/platform/chrome/cros_kbd_led_backlight.c
> @@ -10,6 +10,7 @@
>  #include <linux/kernel.h>
>  #include <linux/leds.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/slab.h>
>
> @@ -128,8 +129,11 @@ static int keyboard_led_probe(struct platform_device *pdev)
>         int error;
>
>         drvdata = acpi_device_get_match_data(&pdev->dev);
> -       if (!drvdata)
> -               return -EINVAL;
> +       if (!drvdata) {
> +               drvdata = of_device_get_match_data(&pdev->dev);
> +               if (!drvdata)
> +                       return -EINVAL;
> +       }

I'm not familiar with this driver, so can't do a full review, but
shouldn't device_get_match_data()
from property.h [1] be able to handle both DT and ACPI cases?

[1]: https://elixir.bootlin.com/linux/v5.17-rc4/source/include/linux/property.h

>
>         if (drvdata->init) {
>                 error = drvdata->init(pdev);
> @@ -161,10 +165,19 @@ static const struct acpi_device_id keyboard_led_acpi_match[] = {
>  };
>  MODULE_DEVICE_TABLE(acpi, keyboard_led_acpi_match);
>
> +static const struct of_device_id keyboard_led_of_match[] = {
> +       {
> +               .compatible = "google,cros-kbd-led-backlight",
> +       },
> +       {}
> +};
> +MODULE_DEVICE_TABLE(of, keyboard_led_of_match);
> +
>  static struct platform_driver keyboard_led_driver = {
>         .driver         = {
>                 .name   = "chromeos-keyboard-leds",
>                 .acpi_match_table = ACPI_PTR(keyboard_led_acpi_match),
> +               .of_match_table = of_match_ptr(keyboard_led_of_match),
>         },
>         .probe          = keyboard_led_probe,
>  };
> --
> 2.35.1.265.g69c8d7142f-goog
>
>