linux-kernel - Re: [PATCH] pwm: rz-mtu3: Share parent device node to MTU3 PWM

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Message-ID: <lp2axyn3vyiuk47kf3uqqwasc64a5d24qk76hkavyn4h66zg4g@psygukqadrvl>
Date: Wed, 24 Dec 2025 07:33:12 +0100
From: Uwe Kleine-König <ukleinek@...nel.org>
To: Martyn Welch <martyn.welch@...labora.com>
Cc: kernel@...labora.com, 
	Sebastian Reichel <sebastian.reichel@...labora.com>, linux-pwm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pwm: rz-mtu3: Share parent device node to MTU3 PWM

Hello,

On Thu, Oct 09, 2025 at 05:24:44PM +0100, Martyn Welch wrote:
> The PWM currently functions, however if we try to utilise the pwn in a
> device tree, for example as a pwm-backlight:
> 
>         lcd_bl: backlight {
>                 compatible = "pwm-backlight";
>                 pwms = <&mtu3 3 833333>;
> 		...
> 
> This fails:
> 
> [   15.603948] platform backlight: deferred probe pending: pwm-backlight: unable to request PWM
> 
> The PWM driver forms part of the Renesas Multi-Function Timer Pulse Unit
> 3. The PWM does not have a DT node of it's own. Share the DT node of the
> parent MFD device, so that the PWM channels can be referenced via phandles.
> 
> Co-developed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> Signed-off-by: Martyn Welch <martyn.welch@...labora.com>

This thread didn't see action for a time and the patch isn't suitable to
go in as is. So I'm discarding this patch from patchwork and my inbox.

Best regards
Uwe

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