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 ---
Changes since v1: - Corrected email address on two of the patches
Thanks, Charles
sound/soc/codecs/wm8804.c | 26 +++++++++++++++++++++----- 1 files changed, 21 insertions(+), 5 deletions(-)
diff --git a/sound/soc/codecs/wm8804.c b/sound/soc/codecs/wm8804.c index f44da83..cc168c4 100644 --- a/sound/soc/codecs/wm8804.c +++ b/sound/soc/codecs/wm8804.c @@ -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,