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Mon, 20 Jun 2022 23:55:00 -0400 (EDT) From: Samuel Holland To: Chen-Yu Tsai , Jernej Skrabec , Liam Girdwood , Mark Brown Subject: [PATCH v2 2/3] ASoC: sun50i-codec-analog: Add support for internal bias Date: Mon, 20 Jun 2022 22:54:51 -0500 Message-Id: <20220621035452.60272-3-samuel@sholland.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220621035452.60272-1-samuel@sholland.org> References: <20220621035452.60272-1-samuel@sholland.org> MIME-Version: 1.0 Cc: devicetree@vger.kernel.org, Arnaud Ferraris , alsa-devel@alsa-project.org, Samuel Holland , linux-kernel@vger.kernel.org, Takashi Iwai , Maxime Ripard , Rob Herring , Krzysztof Kozlowski , linux-sunxi@lists.linux.dev, linux-arm-kernel@lists.infradead.org X-BeenThere: alsa-devel@alsa-project.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: alsa-devel-bounces@alsa-project.org Sender: "Alsa-devel" From: Arnaud Ferraris 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 [Samuel: split binding and implementation; move to device probe] Signed-off-by: Samuel Holland --- 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);