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ASoC: wm8804: Add support for hardware reset line

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It is best to use the physical reset if it is available. This patch adds
support for a GPIO controlled physical reset for the chip.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Charles Keepax
2015-04-07 11:34:50 +01:00
committed by Mark Brown
parent 45ad3e67f6
commit 7e5ee1c33e
1 changed files with 21 additions and 5 deletions
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26
sound/soc/codecs/wm8804.c
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@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/gpio/consumer.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/of_device.h>
@ -61,6 +62,8 @@ struct wm8804_priv {
struct regulator_bulk_data supplies[WM8804_NUM_SUPPLIES];
struct notifier_block disable_nb[WM8804_NUM_SUPPLIES];
int mclk_div;
struct gpio_desc *reset;
};
static int txsrc_get(struct snd_kcontrol *kcontrol,
@ -182,7 +185,7 @@ static bool wm8804_volatile(struct device *dev, unsigned int reg)
}
}
static int wm8804_reset(struct wm8804_priv *wm8804)
static int wm8804_soft_reset(struct wm8804_priv *wm8804)
{
return regmap_write(wm8804->regmap, WM8804_RST_DEVID1, 0x0);
}
@ -586,6 +589,14 @@ int wm8804_probe(struct device *dev, struct regmap *regmap)
wm8804->regmap = regmap;
wm8804->reset = devm_gpiod_get_optional(dev, "wlf,reset",
GPIOD_OUT_LOW);
if (IS_ERR(wm8804->reset)) {
ret = PTR_ERR(wm8804->reset);
dev_err(dev, "Failed to get reset line: %d\n", ret);
return ret;
}
for (i = 0; i < ARRAY_SIZE(wm8804->supplies); i++)
wm8804->supplies[i].supply = wm8804_supply_names[i];
@ -620,6 +631,9 @@ int wm8804_probe(struct device *dev, struct regmap *regmap)
return ret;
}
if (wm8804->reset)
gpiod_set_value_cansleep(wm8804->reset, 1);
ret = regmap_read(regmap, WM8804_RST_DEVID1, &id1);
if (ret < 0) {
dev_err(dev, "Failed to read device ID: %d\n", ret);
@ -648,10 +662,12 @@ int wm8804_probe(struct device *dev, struct regmap *regmap)
}
dev_info(dev, "revision %c\n", id1 + 'A');
ret = wm8804_reset(wm8804);
if (ret < 0) {
dev_err(dev, "Failed to issue reset: %d\n", ret);
goto err_reg_enable;
if (!wm8804->reset) {
ret = wm8804_soft_reset(wm8804);
if (ret < 0) {
dev_err(dev, "Failed to issue reset: %d\n", ret);
goto err_reg_enable;
}
}
ret = snd_soc_register_codec(dev, &soc_codec_dev_wm8804,