linux-kernel - [PATCH v4 2/3] ASoC: wm8782: Use wlf,fsampen device tree property

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Date:   Mon, 18 Sep 2023 23:15:31 +1000
From:   John Watts <contact@...kia.org>
To:     alsa-devel@...a-project.org
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Charles Keepax <ckeepax@...nsource.cirrus.com>,
        John Watts <contact@...kia.org>, patches@...nsource.cirrus.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/3] ASoC: wm8782: Use wlf,fsampen device tree property

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@...kia.org>
Acked-by: Charles Keepax <ckeepax@...nsource.cirrus.com>
---
 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 f3dc87b92b1e..3a2acdfa9b85 100644
--- a/sound/soc/codecs/wm8782.c
+++ b/sound/soc/codecs/wm8782.c
@@ -119,8 +119,9 @@ 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)
@@ -136,8 +137,26 @@ 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