linux-kernel - Re: [PATCH 2/4] reset: add GPIO-based reset controller

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Date: Fri, 22 Dec 2023 16:08:38 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
 Banajit Goswami <bgoswami@...cinc.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
 Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
 linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
 linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: Bartosz Golaszewski <brgl@...ev.pl>,
 Sean Anderson <sean.anderson@...o.com>
Subject: Re: [PATCH 2/4] reset: add GPIO-based reset controller

On 22/12/2023 16:01, Krzysztof Kozlowski wrote:
> Add simple driver to control GPIO-based resets using the reset
> controller API for the cases when the GPIOs are shared and reset should
> be coordinated.  The driver is expected to be used by reset core
> framework for ad-hoc reset controllers.

...

> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, &priv->rc);
> +	device_set_node(dev, of_fwnode_handle(*platdata));
> +
> +	/*
> +	 * Need to get non-exclusive because it is used in reset core as cookie
> +	 * to find existing controllers.  However the actual use is exclusive.
> +	 */

This comment is a left-over of my work-in-progress and it is not
accurate anymore. Exclusive GPIOs are not used, which should make
Bartosz happy!

I will remove it in v2.


Best regards,
Krzysztof