linux-kernel - Re: [PATCH v6 2/6] mux: gpio: add optional regulator support

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Message-ID: <aBynhb6voxJvZtB7@hovoldconsulting.com>
Date: Thu, 8 May 2025 14:45:57 +0200
From: Johan Hovold <johan@...nel.org>
To: srinivas.kandagatla@...aro.org,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: peda@...ntia.se, broonie@...nel.org, andersson@...nel.org,
	krzk+dt@...nel.org, ivprusov@...utedevices.com,
	luca.ceresoli@...tlin.com, zhoubinbin@...ngson.cn,
	paulha@...nsource.cirrus.com, lgirdwood@...il.com, robh@...nel.org,
	conor+dt@...nel.org, konradybcio@...nel.org, perex@...ex.cz,
	tiwai@...e.com, dmitry.baryshkov@....qualcomm.com,
	linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	johan+linaro@...nel.org,
	Christopher Obbard <christopher.obbard@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH v6 2/6] mux: gpio: add optional regulator support

On Wed, Apr 02, 2025 at 10:05:14AM +0200, Johan Hovold wrote:
> On Thu, Mar 27, 2025 at 10:06:29AM +0000, Srinivas Kandagatla wrote:
> > From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> > 
> > Some of the external muxes needs powering up using a regulator.
> > This is the case with Lenovo T14s laptop which has a external audio mux
> > to handle US/EURO headsets.
> > 
> > Add support to the driver to handle this optional regulator.
> > 
> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> > Tested-by: Christopher Obbard <christopher.obbard@...aro.org>
> 
> > @@ -82,6 +83,10 @@ static int mux_gpio_probe(struct platform_device *pdev)
> >  		mux_chip->mux->idle_state = idle_state;
> >  	}
> >  
> > +	ret = devm_regulator_get_enable_optional(dev, "mux");
> > +	if (ret && ret != -ENODEV)
> > +		return dev_err_probe(dev, ret, "Couldn't retrieve/enable gpio mux supply\n");
> 
> nit: "failed to get/enable mux supply" may be more consistent with the
> other (non-capitalised error) messages and avoids repeating "gpio mux"
> which will be added by driver core.
> 
> > +
> >  	ret = devm_mux_chip_register(dev, mux_chip);
> >  	if (ret < 0)
> >  		return ret;
> 
> Either way:
> 
> Reviewed-by: Johan Hovold <johan+linaro@...nel.org>
> Tested-by: Johan Hovold <johan+linaro@...nel.org>

Can someone please pick this one and the binding update up for 6.16?

I see you recently volunteered to do so, Krzysztof? [1]

Johan

[1] https://lore.kernel.org/all/20250501175303.144102-2-krzysztof.kozlowski@linaro.org/