Re: [RESEND PATCH 1/3] iio: st_sensors: get platform data from device tree

[Jonathan Cameron <jic23@kernel.org>]

On 07/07/14 10:47, Linus Walleij wrote:
> Currently the STMicroelectronics sensors only support one single
> platform data item: configuration of the DRDY (data ready) pin
> for a particular design. Augment the core to prioritize and take
> this information from the device tree if the parent device has an
> assigned device node, else fall back to passed in platform data
> (usually the default data).
>
> Cc: Lee Jones <lee.jones@linaro.org>
> Cc: Denis CIOCCA <denis.ciocca@st.com>
> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Thanks for resending these.  I'd lost them completely!

Anyhow, applied to the togreg branch of iio.git which will initially
get pushed out as testing for the autobuilders to play ball.

J
> ---
>   drivers/iio/common/st_sensors/st_sensors_core.c | 35 ++++++++++++++++++++++++-
>   1 file changed, 34 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
> index e8b932fed70e..1cdcef94e6a2 100644
> --- a/drivers/iio/common/st_sensors/st_sensors_core.c
> +++ b/drivers/iio/common/st_sensors/st_sensors_core.c
> @@ -14,8 +14,8 @@
>   #include <linux/delay.h>
>   #include <linux/iio/iio.h>
>   #include <linux/regulator/consumer.h>
> +#include <linux/of.h>
>   #include <asm/unaligned.h>
> -
>   #include <linux/iio/common/st_sensors.h>
>
>
> @@ -265,14 +265,47 @@ static int st_sensors_set_drdy_int_pin(struct iio_dev *indio_dev,
>   	return 0;
>   }
>
> +#ifdef CONFIG_OF
> +static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
> +		struct st_sensors_platform_data *defdata)
> +{
> +	struct st_sensors_platform_data *pdata;
> +	struct device_node *np = dev->of_node;
> +	u32 val;
> +
> +	if (!np)
> +		return NULL;
> +
> +	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> +	if (!of_property_read_u32(np, "st,drdy-int-pin", &val) && (val <= 2))
> +		pdata->drdy_int_pin = (u8) val;
> +	else
> +		pdata->drdy_int_pin = defdata ? defdata->drdy_int_pin : 1;
> +
> +	return pdata;
> +}
> +#else
> +static struct st_sensors_platform_data *st_sensors_of_probe(struct device *dev,
> +		struct st_sensors_platform_data *defdata)
> +{
> +	return NULL;
> +}
> +#endif
> +
>   int st_sensors_init_sensor(struct iio_dev *indio_dev,
>   					struct st_sensors_platform_data *pdata)
>   {
>   	struct st_sensor_data *sdata = iio_priv(indio_dev);
> +	struct st_sensors_platform_data *of_pdata;
>   	int err = 0;
>
>   	mutex_init(&sdata->tb.buf_lock);
>
> +	/* If OF/DT pdata exists, it will take precedence of anything else */
> +	of_pdata = st_sensors_of_probe(indio_dev->dev.parent, pdata);
> +	if (of_pdata)
> +		pdata = of_pdata;
> +
>   	if (pdata)
>   		err = st_sensors_set_drdy_int_pin(indio_dev, pdata);
>
>