linux-kernel - Re: [PATCH v2 2/5] Staging: iio: adt7316: Use device tree data to set ldac

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Date:   Sun, 25 Nov 2018 11:49:07 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Shreeya Patel <shreeya.patel23498@...il.com>
Cc:     lars@...afoo.de, Michael.Hennerich@...log.com, knaack.h@....de,
        pmeerw@...erw.net, gregkh@...uxfoundation.org,
        linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] Staging: iio: adt7316: Use device tree data to
 set ldac_pin

On Tue, 20 Nov 2018 22:24:36 +0530
Shreeya Patel <shreeya.patel23498@...il.com> wrote:

> Make the driver use device tree instead of the platform data.
> Hence, use devm_gpiod_get_optional function to get the data from
> device tree for ldac-pin and accordingly make the needed changes
> in the driver.
> 
> Signed-off-by: Shreeya Patel <shreeya.patel23498@...il.com>
Sorry, missed this previously.  This is definitely a non standard
gpio name, so should be prefixed in the binding and here with
adi,

I'll fix up, but please check I didn't mess it up!

Applied with that change to the togreg branch of iio.git.

Thanks,

Jonathan
 
> ---
>  drivers/staging/iio/addac/adt7316.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/iio/addac/adt7316.c b/drivers/staging/iio/addac/adt7316.c
> index 3f22d1088713..deb2f7b40f60 100644
> --- a/drivers/staging/iio/addac/adt7316.c
> +++ b/drivers/staging/iio/addac/adt7316.c
> @@ -177,7 +177,7 @@
>  
>  struct adt7316_chip_info {
>  	struct adt7316_bus	bus;
> -	u16			ldac_pin;
> +	struct gpio_desc	*ldac_pin;
>  	u16			int_mask;	/* 0x2f */
>  	u8			config1;
>  	u8			config2;
> @@ -950,8 +950,8 @@ static ssize_t adt7316_store_update_DAC(struct device *dev,
>  		if (ret)
>  			return -EIO;
>  	} else {
> -		gpio_set_value(chip->ldac_pin, 0);
> -		gpio_set_value(chip->ldac_pin, 1);
> +		gpiod_set_value(chip->ldac_pin, 0);
> +		gpiod_set_value(chip->ldac_pin, 1);
>  	}
>  
>  	return len;
> @@ -2120,7 +2120,13 @@ int adt7316_probe(struct device *dev, struct adt7316_bus *bus,
>  	else
>  		return -ENODEV;
>  
> -	chip->ldac_pin = adt7316_platform_data[1];
> +	chip->ldac_pin = devm_gpiod_get_optional(dev, "ldac", GPIOD_OUT_LOW);
> +	if (IS_ERR(chip->ldac_pin)) {
> +		ret = PTR_ERR(chip->ldac_pin);
> +		dev_err(dev, "Failed to request ldac GPIO: %d\n", ret);
> +		return ret;
> +	}
> +
>  	if (chip->ldac_pin) {
>  		chip->config3 |= ADT7316_DA_EN_VIA_DAC_LDCA;
>  		if ((chip->id & ID_FAMILY_MASK) == ID_ADT75XX)