linux-kernel - Re: [PATCH v1 2/2] ASoC: codecs: wsa883x: Handle shared reset GPIO for WSA883x speakers

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Message-ID: <v7oxwbf6xjc2gxeviwe4tayovzasysqig5smk752an74qd2e46@q25ymfyru3ze>
Date: Tue, 24 Jun 2025 05:43:39 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Mohammad Rafi Shaik <mohammad.rafi.shaik@....qualcomm.com>
Cc: Srinivas Kandagatla <srini@...nel.org>,
        Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>, linux-arm-msm@...r.kernel.org,
        linux-sound@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        quic_pkumpatl@...cinc.com, kernel@....qualcomm.com
Subject: Re: [PATCH v1 2/2] ASoC: codecs: wsa883x: Handle shared reset GPIO
 for WSA883x speakers

On Fri, Jun 20, 2025 at 04:00:12PM +0530, Mohammad Rafi Shaik wrote:
> On some Qualcomm platforms, such as QCS6490-RB3Gen2 and QCM6490-IDP,
> multiple WSA8830/WSA8835 speakers share a common reset (shutdown) GPIO.
> To handle such cases, use the reset controller framework along with the
> "reset-gpio" driver.
> 
> Signed-off-by: Mohammad Rafi Shaik <mohammad.rafi.shaik@....qualcomm.com>
> ---
>  sound/soc/codecs/wsa883x.c | 57 ++++++++++++++++++++++++++++++++------
>  1 file changed, 48 insertions(+), 9 deletions(-)
> 
> diff --git a/sound/soc/codecs/wsa883x.c b/sound/soc/codecs/wsa883x.c
> index 13c9d4a6f015..b82b925c1f8d 100644
> --- a/sound/soc/codecs/wsa883x.c
> +++ b/sound/soc/codecs/wsa883x.c
> @@ -14,6 +14,7 @@
>  #include <linux/printk.h>
>  #include <linux/regmap.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/reset.h>
>  #include <linux/slab.h>
>  #include <linux/soundwire/sdw.h>
>  #include <linux/soundwire/sdw_registers.h>
> @@ -468,6 +469,7 @@ struct wsa883x_priv {
>  	struct sdw_stream_runtime *sruntime;
>  	struct sdw_port_config port_config[WSA883X_MAX_SWR_PORTS];
>  	struct gpio_desc *sd_n;
> +	struct reset_control *sd_reset;
>  	bool port_prepared[WSA883X_MAX_SWR_PORTS];
>  	bool port_enable[WSA883X_MAX_SWR_PORTS];
>  	int active_ports;
> @@ -1547,6 +1549,44 @@ static const struct hwmon_chip_info wsa883x_hwmon_chip_info = {
>  	.info	= wsa883x_hwmon_info,
>  };
>  
> +static void wsa883x_reset_powerdown(void *data)
> +{
> +	struct wsa883x_priv *wsa883x = data;
> +
> +	if (wsa883x->sd_reset)
> +		reset_control_assert(wsa883x->sd_reset);
> +	else
> +		gpiod_direction_output(wsa883x->sd_n, 1);
> +}
> +
> +static void wsa883x_reset_deassert(struct wsa883x_priv *wsa883x)

Please name these two functions in using antonyms (e.g. init/fini,
powerup / powerdown, assert / deassert, etc).

> +{
> +	if (wsa883x->sd_reset)
> +		reset_control_deassert(wsa883x->sd_reset);
> +	else
> +		gpiod_direction_output(wsa883x->sd_n, 0);
> +}
> +
> +static int wsa883x_get_reset(struct device *dev, struct wsa883x_priv *wsa883x)
> +{
> +	wsa883x->sd_reset = devm_reset_control_get_optional_shared(dev, NULL);
> +	if (IS_ERR(wsa883x->sd_reset))
> +		return dev_err_probe(dev, PTR_ERR(wsa883x->sd_reset),
> +				     "Failed to get reset\n");
> +	else if (wsa883x->sd_reset)

No need for 'else' here.

> +		return 0;
> +	/*
> +	 * else: NULL, so use the backwards compatible way for powerdown-gpios,
> +	 * which does not handle sharing GPIO properly.
> +	 */
> +	wsa883x->sd_n = devm_gpiod_get_optional(dev, "powerdown",
> +						GPIOD_FLAGS_BIT_NONEXCLUSIVE | GPIOD_OUT_HIGH);
> +	if (IS_ERR(wsa883x->sd_n))
> +		return dev_err_probe(dev, PTR_ERR(wsa883x->sd_n),
> +				     "Shutdown Control GPIO not found\n");
> +	return 0;
> +}
> +
>  static int wsa883x_probe(struct sdw_slave *pdev,
>  			 const struct sdw_device_id *id)
>  {
> @@ -1567,13 +1607,9 @@ static int wsa883x_probe(struct sdw_slave *pdev,
>  	if (ret)
>  		return dev_err_probe(dev, ret, "Failed to enable vdd regulator\n");
>  
> -	wsa883x->sd_n = devm_gpiod_get_optional(dev, "powerdown",
> -						GPIOD_FLAGS_BIT_NONEXCLUSIVE | GPIOD_OUT_HIGH);
> -	if (IS_ERR(wsa883x->sd_n)) {
> -		ret = dev_err_probe(dev, PTR_ERR(wsa883x->sd_n),
> -				    "Shutdown Control GPIO not found\n");
> -		goto err;
> -	}
> +	ret = wsa883x_get_reset(dev, wsa883x);
> +	if (ret)
> +		return ret;
>  
>  	dev_set_drvdata(dev, wsa883x);
>  	wsa883x->slave = pdev;
> @@ -1596,11 +1632,14 @@ static int wsa883x_probe(struct sdw_slave *pdev,
>  	pdev->prop.simple_clk_stop_capable = true;
>  	pdev->prop.sink_dpn_prop = wsa_sink_dpn_prop;
>  	pdev->prop.scp_int1_mask = SDW_SCP_INT1_BUS_CLASH | SDW_SCP_INT1_PARITY;
> -	gpiod_direction_output(wsa883x->sd_n, 0);
> +
> +	wsa883x_reset_deassert(wsa883x);
> +	ret = devm_add_action_or_reset(dev, wsa883x_reset_powerdown, wsa883x);
> +	if (ret)
> +		return ret;
>  
>  	wsa883x->regmap = devm_regmap_init_sdw(pdev, &wsa883x_regmap_config);
>  	if (IS_ERR(wsa883x->regmap)) {
> -		gpiod_direction_output(wsa883x->sd_n, 1);
>  		ret = dev_err_probe(dev, PTR_ERR(wsa883x->regmap),
>  				    "regmap_init failed\n");
>  		goto err;
> -- 
> 2.34.1
> 

-- 
With best wishes
Dmitry