Re: [PATCH 2/7] ASoC: codec: tlv320aic32x4: Convert to GPIO descriptors

[Alexander Stein]

Hi,

Am Dienstag, 8. April 2025, 03:39:58 CEST schrieb Peng Fan (OSS):
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> of_gpio.h is deprecated, update the driver to use GPIO descriptors.
>  - Use devm_gpiod_get_optional to get GPIO descriptor, and set consumer
>    name.
>  - Use gpiod_set_value to configure output value.
> 
> reset pin is active low, so when request the gpio, set GPIOD_OUT_HIGH to
> assert reset and later deassert reset with value set to 0.

IMHO it shouldn't matter if that pin is active-low or not. You want to
activate that reset, so GPIOD_OUT_HIGH is correct. If the GPIO is active-low
then nice, everything will be taken careof.

> While at here, reorder the included headers.
> 
> Checking the DTS that use the device, all are using GPIOD_ACTIVE_LOW
> polarity for reset-gpios, so all should work as expected with this patch.
> 
> Cc: Markus Niebel <Markus.Niebel@xxxxxxxxxxxxxxx>
> Cc: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>  sound/soc/codecs/tlv320aic32x4.c | 44 ++++++++++++++++++++--------------------
>  1 file changed, 22 insertions(+), 22 deletions(-)
> 
> diff --git a/sound/soc/codecs/tlv320aic32x4.c b/sound/soc/codecs/tlv320aic32x4.c
> index 7dbcf7f7130b04a27f58f20beb83eb3676c79c3d..1423186f5a6c181a20dd2dd552679d33174edaee 100644
> --- a/sound/soc/codecs/tlv320aic32x4.c
> +++ b/sound/soc/codecs/tlv320aic32x4.c
> @@ -9,27 +9,26 @@
>   * Based on sound/soc/codecs/wm8974 and TI driver for kernel 2.6.27.
>   */
>  
> -#include <linux/module.h>
> -#include <linux/moduleparam.h>
> -#include <linux/init.h>
> -#include <linux/delay.h>
> -#include <linux/pm.h>
> -#include <linux/gpio.h>
> -#include <linux/of_gpio.h>
>  #include <linux/cdev.h>
> -#include <linux/slab.h>
>  #include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
>  #include <linux/of_clk.h>
> +#include <linux/pm.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/slab.h>
>  
> -#include <sound/tlv320aic32x4.h>
>  #include <sound/core.h>
> +#include <sound/initval.h>
>  #include <sound/pcm.h>
>  #include <sound/pcm_params.h>
>  #include <sound/soc.h>
>  #include <sound/soc-dapm.h>
> -#include <sound/initval.h>
>  #include <sound/tlv.h>
> +#include <sound/tlv320aic32x4.h>
>  
>  #include "tlv320aic32x4.h"
>  
> @@ -38,7 +37,7 @@ struct aic32x4_priv {
>  	u32 power_cfg;
>  	u32 micpga_routing;
>  	bool swapdacs;
> -	int rstn_gpio;
> +	struct gpio_desc *rstn_gpio;
>  	const char *mclk_name;
>  
>  	struct regulator *supply_ldo;
> @@ -1236,7 +1235,14 @@ static int aic32x4_parse_dt(struct aic32x4_priv *aic32x4,
>  
>  	aic32x4->swapdacs = false;
>  	aic32x4->micpga_routing = 0;
> -	aic32x4->rstn_gpio = of_get_named_gpio(np, "reset-gpios", 0);
> +	/* Assert reset using GPIOD_OUT_HIGH, because reset is GPIO_ACTIVE_LOW */

As stated above this comment shouldn't be necessary, it might be even
confusing if there is some external inverter to the GPIO.

> +	aic32x4->rstn_gpio = devm_gpiod_get_optional(aic32x4->dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(aic32x4->rstn_gpio)) {
> +		return dev_err_probe(aic32x4->dev, PTR_ERR(aic32x4->rstn_gpio),
> +				     "Failed to get reset gpio\n");
> +	} else {
> +		gpiod_set_consumer_name(aic32x4->rstn_gpio, "tlv320aic32x4_rstn");

Any reason to not set the consumer name to "tlv320aic32x4_reset"? I assume
the 'n' implies active-low. But this is something for the devicetree, not the driver.

Best regards,
Alexander

> +	}
>  
>  	if (of_property_read_u32_array(np, "aic32x4-gpio-func",
>  				aic32x4_setup->gpio_func, 5) >= 0)
> @@ -1372,26 +1378,20 @@ int aic32x4_probe(struct device *dev, struct regmap *regmap,
>  		aic32x4->power_cfg = 0;
>  		aic32x4->swapdacs = false;
>  		aic32x4->micpga_routing = 0;
> -		aic32x4->rstn_gpio = -1;
> +		aic32x4->rstn_gpio = ERR_PTR(-ENOENT);
>  		aic32x4->mclk_name = "mclk";
>  	}
>  
> -	if (gpio_is_valid(aic32x4->rstn_gpio)) {
> -		ret = devm_gpio_request_one(dev, aic32x4->rstn_gpio,
> -				GPIOF_OUT_INIT_LOW, "tlv320aic32x4 rstn");
> -		if (ret != 0)
> -			return ret;
> -	}
> -
>  	ret = aic32x4_setup_regulators(dev, aic32x4);
>  	if (ret) {
>  		dev_err(dev, "Failed to setup regulators\n");
>  		return ret;
>  	}
>  
> -	if (gpio_is_valid(aic32x4->rstn_gpio)) {
> +	if (!IS_ERR(aic32x4->rstn_gpio)) {
>  		ndelay(10);
> -		gpio_set_value_cansleep(aic32x4->rstn_gpio, 1);
> +		/* deassert reset */
> +		gpiod_set_value_cansleep(aic32x4->rstn_gpio, 0);
>  		mdelay(1);
>  	}
>  
> 
> 


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