linux-kernel - Re: [PATCH] mfd: omap-usb-host: fix OF populate on driver rebind

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Message-ID: <20260109163725.GB1808297@google.com>
Date: Fri, 9 Jan 2026 16:37:25 +0000
From: Lee Jones <lee@...nel.org>
To: Johan Hovold <johan@...nel.org>
Cc: Aaro Koskinen <aaro.koskinen@....fi>,
	Andreas Kemnade <andreas@...nade.info>,
	Kevin Hilman <khilman@...libre.com>,
	Roger Quadros <rogerq@...nel.org>, Tony Lindgren <tony@...mide.com>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] mfd: omap-usb-host: fix OF populate on driver rebind

On Fri, 19 Dec 2025, Johan Hovold wrote:

> Since commit c6e126de43e7 ("of: Keep track of populated platform
> devices") child devices will not be created by of_platform_populate()
> if the devices had previously been deregistered individually so that the
> OF_POPULATED flag is still set in the corresponding OF nodes.
> 
> Switch to using of_platform_depopulate() instead of open coding so that
> the child devices are created if the driver is rebound.
> 
> Fixes: c6e126de43e7 ("of: Keep track of populated platform devices")
> Cc: stable@...r.kernel.org	# 3.16
> Signed-off-by: Johan Hovold <johan@...nel.org>
> ---
>  drivers/mfd/omap-usb-host.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
> index a77b6fc790f2..4d29a6e2ed87 100644
> --- a/drivers/mfd/omap-usb-host.c
> +++ b/drivers/mfd/omap-usb-host.c
> @@ -819,8 +819,10 @@ static void usbhs_omap_remove(struct platform_device *pdev)
>  {
>  	pm_runtime_disable(&pdev->dev);
>  
> -	/* remove children */
> -	device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
> +	if (pdev->dev.of_node)
> +		of_platform_depopulate(&pdev->dev);

devm_of_platform_populate()?

> +	else
> +		device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);

What on earth is this driver even doing in MFD?

Nightmare - quick dig, bury it!

-- 
Lee Jones [李琼斯]