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Message-Id: <20220621035452.60272-3-samuel@sholland.org>
Date: Mon, 20 Jun 2022 22:54:51 -0500
From: Samuel Holland <samuel@...lland.org>
To: Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>
Cc: Arnaud Ferraris <arnaud.ferraris@...labora.com>,
Samuel Holland <samuel@...lland.org>,
Jaroslav Kysela <perex@...ex.cz>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Maxime Ripard <mripard@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org, linux-sunxi@...ts.linux.dev
Subject: [PATCH v2 2/3] ASoC: sun50i-codec-analog: Add support for internal bias
From: Arnaud Ferraris <arnaud.ferraris@...labora.com>
In order to properly bias headset microphones, there should be a pull-up
resistor between pins HBIAS and MIC2P. This can be an external resistor,
but the codec also provides an internal 2.2K resistor which is enabled
by a register.
This patch enables or disables the internal bias resistor based on a
device tree property.
Signed-off-by: Arnaud Ferraris <arnaud.ferraris@...labora.com>
[Samuel: split binding and implementation; move to device probe]
Signed-off-by: Samuel Holland <samuel@...lland.org>
---
Changes in v2:
- Move register update from component probe to device probe
sound/soc/sunxi/sun50i-codec-analog.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/sound/soc/sunxi/sun50i-codec-analog.c b/sound/soc/sunxi/sun50i-codec-analog.c
index a41e25ad0aaf..e1e5e8de0130 100644
--- a/sound/soc/sunxi/sun50i-codec-analog.c
+++ b/sound/soc/sunxi/sun50i-codec-analog.c
@@ -117,6 +117,7 @@
#define SUN50I_ADDA_HS_MBIAS_CTRL_MMICBIASEN 7
#define SUN50I_ADDA_JACK_MIC_CTRL 0x1d
+#define SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN 6
#define SUN50I_ADDA_JACK_MIC_CTRL_HMICBIASEN 5
/* mixer controls */
@@ -507,6 +508,7 @@ static int sun50i_codec_analog_probe(struct platform_device *pdev)
{
struct regmap *regmap;
void __iomem *base;
+ bool enable;
base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(base)) {
@@ -520,6 +522,12 @@ static int sun50i_codec_analog_probe(struct platform_device *pdev)
return PTR_ERR(regmap);
}
+ enable = device_property_read_bool(&pdev->dev,
+ "allwinner,internal-bias-resistor");
+ regmap_update_bits(regmap, SUN50I_ADDA_JACK_MIC_CTRL,
+ BIT(SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN),
+ enable << SUN50I_ADDA_JACK_MIC_CTRL_INNERRESEN);
+
return devm_snd_soc_register_component(&pdev->dev,
&sun50i_codec_analog_cmpnt_drv,
NULL, 0);
--
2.35.1
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