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ASoC: sta32x: Add support for XTI clock

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The STA32x chips feature an XTI clock input that needs to be stable before
the reset signal is released. Therefore, the chip driver needs to get a
handle to the clock. Instead of relying on other parts of the system to
enable the clock, let the codec driver grab a handle itself.

In order to keep existing boards working, clock support is made optional.

Signed-off-by: Daniel Mack <daniel@zonque.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Daniel Mack 2018-10-17 13:37:03 +02:00 committed by Mark Brown
parent 1e3cb6c321
commit fce9ec954a
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GPG Key ID: 24D68B725D5487D0
2 changed files with 34 additions and 0 deletions
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6
Documentation/devicetree/bindings/sound/st,sta32x.txt
View File

@ -19,6 +19,10 @@ Required properties:
Optional properties:
- clocks, clock-names: Clock specifier for XTI input clock.
If specified, the clock will be enabled when the codec is probed,
and disabled when it is removed. The 'clock-names' must be set to 'xti'.
- st,output-conf: number, Selects the output configuration:
0: 2-channel (full-bridge) power, 2-channel data-out
1: 2 (half-bridge). 1 (full-bridge) on-board power
@ -79,6 +83,8 @@ Example:
codec: sta32x@38 {
compatible = "st,sta32x";
reg = <0x1c>;
clocks = <&clock>;
clock-names = "xti";
reset-gpios = <&gpio1 19 0>;
power-down-gpios = <&gpio1 16 0>;
st,output-conf = /bits/ 8 <0x3>; // set output to 2-channel

28
sound/soc/codecs/sta32x.c
View File

@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
@ -142,6 +143,7 @@ static const char *sta32x_supply_names[] = {
/* codec private data */
struct sta32x_priv {
struct regmap *regmap;
struct clk *xti_clk;
struct regulator_bulk_data supplies[ARRAY_SIZE(sta32x_supply_names)];
struct snd_soc_component *component;
struct sta32x_platform_data *pdata;
@ -879,6 +881,18 @@ static int sta32x_probe(struct snd_soc_component *component)
struct sta32x_priv *sta32x = snd_soc_component_get_drvdata(component);
struct sta32x_platform_data *pdata = sta32x->pdata;
int i, ret = 0, thermal = 0;
sta32x->component = component;
if (sta32x->xti_clk) {
ret = clk_prepare_enable(sta32x->xti_clk);
if (ret != 0) {
dev_err(component->dev,
"Failed to enable clock: %d\n", ret);
return ret;
}
}
ret = regulator_bulk_enable(ARRAY_SIZE(sta32x->supplies),
sta32x->supplies);
if (ret != 0) {
@ -981,6 +995,9 @@ static void sta32x_remove(struct snd_soc_component *component)
sta32x_watchdog_stop(sta32x);
regulator_bulk_disable(ARRAY_SIZE(sta32x->supplies), sta32x->supplies);
if (sta32x->xti_clk)
clk_disable_unprepare(sta32x->xti_clk);
}
static const struct snd_soc_component_driver sta32x_component = {
@ -1097,6 +1114,17 @@ static int sta32x_i2c_probe(struct i2c_client *i2c,
}
#endif
/* Clock */
sta32x->xti_clk = devm_clk_get(dev, "xti");
if (IS_ERR(sta32x->xti_clk)) {
ret = PTR_ERR(sta32x->xti_clk);
if (ret == -EPROBE_DEFER)
return ret;
sta32x->xti_clk = NULL;
}
/* GPIOs */
sta32x->gpiod_nreset = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_LOW);