[PATCH v2 2/3] ASoC: wm8782: Use wlf,fsampen device tree property

John Watts
2023-09-13T17:16:44Z

The wm8782 supports rates 96kHz and 192kHz as long as the hardware
is configured properly. Allow this to be specified in the device tree.

Signed-off-by: John Watts <contact@jookia.org>
---
sound/soc/codecs/wm8782.c | 25 ++++++++++++++++++++++---
1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/wm8782.c b/sound/soc/codecs/wm8782.c
index 63ab63f3189a..249b58b093d6 100644
--- a/sound/soc/codecs/wm8782.c
+++ b/sound/soc/codecs/wm8782.c
@@ -122,8 +122,9 @@ static const struct snd_soc_component_driver soc_component_dev_wm8782 = {
static int wm8782_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
struct wm8782_priv *priv;
- int ret, i;
+ int ret, i, fsampen;

priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
@@ -139,8 +140,26 @@ static int wm8782_probe(struct platform_device *pdev)
if (ret < 0)
return ret;

- /* For configurations with FSAMPEN=0 */
- priv->max_rate = 48000;
+ // Assume lowest value by default to avoid inadvertent overclocking
+ fsampen = 0;
+
+ if (np)
+ of_property_read_u32(np, "wlf,fsampen", &fsampen);
+
+ switch (fsampen) {
+ case 0:
+ priv->max_rate = 48000;
+ break;
+ case 1:
+ priv->max_rate = 96000;
+ break;
+ case 2:
+ priv->max_rate = 192000;
+ break;
+ default:
+ dev_err(dev, "Invalid wlf,fsampen value");
+ return -EINVAL;
+ }

return devm_snd_soc_register_component(&pdev->dev,
&soc_component_dev_wm8782, &wm8782_dai, 1);
--
2.42.0