linux-kernel - Re: [PATCH v5 RESEND 1/6] platform: x86-android-tablets: other: Add swnode for Xiaomi pad2 indicator LED

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Date: Wed, 27 Mar 2024 15:57:47 +0800
From: Kate Hsuan <hpa@...hat.com>
To: Andy Shevchenko <andy.shevchenko@...il.com>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>, linux-leds@...r.kernel.org, 
	platform-driver-x86@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>, 
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>, 
	André Apitzsch <git@...tzsch.eu>, 
	linux-kernel@...r.kernel.org, Sebastian Reichel <sre@...nel.org>, linux-pm@...r.kernel.org
Subject: Re: [PATCH v5 RESEND 1/6] platform: x86-android-tablets: other: Add
 swnode for Xiaomi pad2 indicator LED

Hi Andy,

Thank you for reviewing it.

On Mon, Mar 25, 2024 at 3:30 AM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
> On Sun, Mar 24, 2024 at 5:02 PM Kate Hsuan <hpa@...hat.com> wrote:
> >
> > There is a KTD2026 LED controller to manage the indicator LED for Xiaomi
> > pad2. The ACPI for it is not properly made so the kernel can't get
> > a correct description of it.
> >
> > This work add a description for this RGB LED controller and also set a
>
> adds
> sets
>
> > trigger to indicate the chaging event (bq27520-0-charging). When it is
>
> charging
>
> > charging, the indicator LED will be turn on.
>
> turned
>
> ...
>
> > +/* main fwnode for ktd2026 */
> > +static const struct software_node ktd2026_node = {
> > +       .name = "ktd2026"
>
> Leave a comma, this is not a terminator.
>
> > +};
>
> When I asked about the name I relied on the fact that you have an idea
> how it works. So, assuming my understanding is correct, this platform
> may not have more than a single LED of this type. Dunno if we need a
> comment about this.

I'll make a comment to describe the configuration.
This LED controller can be configured to an RGB LED like this. Also,
it can be configured as three single-color (RGB) LEDs to show red,
green, and blue only.
I think the name can be "ktd2026-multi-color". Is it good for you?


>
> ...
>
> > +static int __init xiaomi_mipad2_init(void)
> > +{
> > +       return software_node_register_node_group(ktd2026_node_group);
> > +}
> > +
> > +static void xiaomi_mipad2_exit(void)
>
> __exit ?
No need.
x86-andriod-tablet is based on platform_driver and platform_device so
it doesn't need __exit.

I put __exit and the compiler complained about the warning.
===
WARNING: modpost:
drivers/platform/x86/x86-android-tablets/x86-android-tablets: section
mismatch in reference: xiaomi_mipad2_info+0x50 (section: .init.rodata)
-> xiaomi_mipad2_exit (section: .exit.text)
===
>
> > +{
> > +       software_node_unregister_node_group(ktd2026_node_group);
> > +}
>
> --
> With Best Regards,
> Andy Shevchenko
>

I'll propose the v6 patch to fix them according to your comments.

--
BR,
Kate