linux-kernel - Re: [PATCH v3 2/5] reset: Instantiate reset GPIO controller for shared reset-gpios

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Date: Wed, 17 Jan 2024 12:26:50 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, 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>,
 Peter Rosin <peda@...ntia.se>, 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,
 linux-i2c@...r.kernel.org
Cc: Bartosz Golaszewski <brgl@...ev.pl>, Chris Packham
 <chris.packham@...iedtelesis.co.nz>, Sean Anderson <sean.anderson@...o.com>
Subject: Re: [PATCH v3 2/5] reset: Instantiate reset GPIO controller for
 shared reset-gpios

On Fr, 2024-01-12 at 17:36 +0100, Krzysztof Kozlowski wrote:
[...]
>  struct reset_control *
>  __of_reset_control_get(struct device_node *node, const char *id, int index,
>  		       bool shared, bool optional, bool acquired)
>  {
> +	struct of_phandle_args args = {0};
> +	bool gpio_fallback = false;
>  	struct reset_control *rstc;
> -	struct reset_controller_dev *r, *rcdev;
> -	struct of_phandle_args args;
> +	struct reset_controller_dev *rcdev;
>  	int rstc_id;
>  	int ret;
>  
> @@ -839,39 +1028,49 @@ __of_reset_control_get(struct device_node *node, const char *id, int index,
>  					 index, &args);
>  	if (ret == -EINVAL)
>  		return ERR_PTR(ret);
> -	if (ret)
> -		return optional ? NULL : ERR_PTR(ret);
> +	if (ret) {

I think this should continue to return optional ? NULL : ERR_PTR(ret)
if !IS_ENABLED(CONFIG_RESET_GPIO), for example by just skipping the
of_parse_phandle_with_args(). That should allow the GPIO fallback in
patch 5 to work as expected.

> +		/*
> +		 * There can be only one reset-gpio for regular devices, so
> +		 * don't bother with GPIO index.
> +		 */
> +		ret = of_parse_phandle_with_args(node, "reset-gpios", "#gpio-cells",
> +						 0, &args);
> +		if (ret)
> +			return optional ? NULL : ERR_PTR(ret);
>  
> -	mutex_lock(&reset_list_mutex);
> -	rcdev = NULL;
> -	list_for_each_entry(r, &reset_controller_list, list) {
> -		if (args.np == r->of_node) {
> -			rcdev = r;
> -			break;
> +		gpio_fallback = true;
> +
> +		ret = __reset_add_reset_gpio_device(&args);
> +		if (ret) {
> +			rstc = ERR_PTR(ret);
> +			goto out_put;
>  		}
>  	}

regards
Philipp