Commit 504eb485 authored by Rasmus Villemoes's avatar Rasmus Villemoes Committed by Jonathan Cameron
Browse files

iio: ad74413r: wire up support for drive-strength-microamp property 



Use the value specified in the channel configuration node to populate
the DIN_SINK field of the DIN_CONFIGx register.

Signed-off-by: default avatarRasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230306094301.1357543-3-linux@rasmusvillemoes.dk


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 954ea91f

drivers/iio/addac/ad74413r.c

+23 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct ad74413r_chip_info { 


struct ad74413r_channel_config {

	u32		func;

	u32		drive_strength;

	bool		gpo_comparator;

	bool		initialized;

};
@@ -111,6 +112,7 @@ struct ad74413r_state { 
#define AD74413R_REG_DIN_CONFIG_X(x)	(0x09 + (x))

#define AD74413R_DIN_DEBOUNCE_MASK	GENMASK(4, 0)

#define AD74413R_DIN_DEBOUNCE_LEN	BIT(5)

#define AD74413R_DIN_SINK_MASK		GENMASK(9, 6)



#define AD74413R_REG_DAC_CODE_X(x)	(0x16 + (x))

#define AD74413R_DAC_CODE_MAX		GENMASK(12, 0)
@@ -261,6 +263,18 @@ static int ad74413r_set_comp_debounce(struct ad74413r_state *st, 
				  val);

}



static int ad74413r_set_comp_drive_strength(struct ad74413r_state *st,

					    unsigned int offset,

					    unsigned int strength)

{

	strength = min(strength, 1800U);



	return regmap_update_bits(st->regmap, AD74413R_REG_DIN_CONFIG_X(offset),

				  AD74413R_DIN_SINK_MASK,

				  FIELD_PREP(AD74413R_DIN_SINK_MASK, strength / 120));

}





static void ad74413r_gpio_set(struct gpio_chip *chip,

			      unsigned int offset, int val)

{
@@ -1190,6 +1204,9 @@ static int ad74413r_parse_channel_config(struct iio_dev *indio_dev, 
	config->gpo_comparator = fwnode_property_read_bool(channel_node,

		"adi,gpo-comparator");



	fwnode_property_read_u32(channel_node, "drive-strength-microamp",

				 &config->drive_strength);



	if (!config->gpo_comparator)

		st->num_gpo_gpios++;
@@ -1269,6 +1286,7 @@ static int ad74413r_setup_gpios(struct ad74413r_state *st) 
	unsigned int gpo_gpio_i = 0;

	unsigned int i;

	u8 gpo_config;

	u32 strength;

	int ret;



	for (i = 0; i < AD74413R_CHANNEL_MAX; i++) {
@@ -1285,6 +1303,11 @@ static int ad74413r_setup_gpios(struct ad74413r_state *st) 
		    config->func == CH_FUNC_DIGITAL_INPUT_LOOP_POWER)

			st->comp_gpio_offsets[comp_gpio_i++] = i;



		strength = config->drive_strength;

		ret = ad74413r_set_comp_drive_strength(st, i, strength);

		if (ret)

			return ret;



		ret = ad74413r_set_gpo_config(st, i, gpo_config);

		if (ret)

			return ret;