The patch
ASoC: tas6424: Add support for the standby pin
has been applied to the asoc tree at
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git
All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted.
You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed.
If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced.
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Thanks, Mark
From e3976aa6fb409aea3cea812f6a0beebb545e5996 Mon Sep 17 00:00:00 2001
From: Jean-Jacques Hiblot jjhiblot@ti.com Date: Fri, 27 Apr 2018 15:55:47 +0200 Subject: [PATCH] ASoC: tas6424: Add support for the standby pin
The standby pin can be connected to a GPIO. In that case we have to drive it to the correct values for the TAS6424 to operate properly.
Signed-off-by: Jean-Jacques Hiblot jjhiblot@ti.com Signed-off-by: Mark Brown broonie@kernel.org --- .../devicetree/bindings/sound/ti,tas6424.txt | 1 + sound/soc/codecs/tas6424.c | 22 +++++++++++++++++++ 2 files changed, 23 insertions(+)
diff --git a/Documentation/devicetree/bindings/sound/ti,tas6424.txt b/Documentation/devicetree/bindings/sound/ti,tas6424.txt index 1c4ada0eef4e..df71e414dc5b 100644 --- a/Documentation/devicetree/bindings/sound/ti,tas6424.txt +++ b/Documentation/devicetree/bindings/sound/ti,tas6424.txt @@ -6,6 +6,7 @@ Required properties: - compatible: "ti,tas6424" - TAS6424 - reg: I2C slave address - sound-dai-cells: must be equal to 0 + - standby-gpios: GPIO used to shut the TAS6424 down.
Example:
diff --git a/sound/soc/codecs/tas6424.c b/sound/soc/codecs/tas6424.c index 4f3a16c520a2..5abb17f8d3dd 100644 --- a/sound/soc/codecs/tas6424.c +++ b/sound/soc/codecs/tas6424.c @@ -16,6 +16,7 @@ #include <linux/slab.h> #include <linux/regulator/consumer.h> #include <linux/delay.h> +#include <linux/gpio/consumer.h>
#include <sound/pcm.h> #include <sound/pcm_params.h> @@ -43,6 +44,7 @@ struct tas6424_data { unsigned int last_fault1; unsigned int last_fault2; unsigned int last_warn; + struct gpio_desc *standby_gpio; };
/* @@ -627,6 +629,22 @@ static int tas6424_i2c_probe(struct i2c_client *client, return ret; }
+ /* + * Get control of the standby pin and set it LOW to take the codec + * out of the stand-by mode. + * Note: The actual pin polarity is taken care of in the GPIO lib + * according the polarity specified in the DTS. + */ + tas6424->standby_gpio = devm_gpiod_get_optional(dev, "standby", + GPIOD_OUT_LOW); + if (IS_ERR(tas6424->standby_gpio)) { + if (PTR_ERR(tas6424->standby_gpio) == -EPROBE_DEFER) + return -EPROBE_DEFER; + dev_info(dev, "failed to get standby GPIO: %ld\n", + PTR_ERR(tas6424->standby_gpio)); + tas6424->standby_gpio = NULL; + } + for (i = 0; i < ARRAY_SIZE(tas6424->supplies); i++) tas6424->supplies[i].supply = tas6424_supply_names[i]; ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(tas6424->supplies), @@ -671,6 +689,10 @@ static int tas6424_i2c_remove(struct i2c_client *client)
cancel_delayed_work_sync(&tas6424->fault_check_work);
+ /* put the codec in stand-by */ + if (tas6424->standby_gpio) + gpiod_set_value_cansleep(tas6424->standby_gpio, 1); + ret = regulator_bulk_disable(ARRAY_SIZE(tas6424->supplies), tas6424->supplies); if (ret < 0) {