linux-kernel - [PATCH] arm64: dts: qcom: sc7180: Add sleep state for alc5682 codec

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Message-Id: <20220818084216.1.I5c2b6fea19c4c0dec67fd4931f03df8e5ccaca95@changeid>
Date:   Thu, 18 Aug 2022 08:42:19 -0700
From:   "Joseph S. Barrera III" <joebar@...omium.org>
To:     linux-arm-msm@...r.kernel.org
Cc:     Stephen Boyd <swboyd@...omium.org>,
        Alexandru Stan <amstan@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        Judy Hsiao <judyhsiao@...omium.org>,
        "Joseph S. Barrera III" <joebar@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: qcom: sc7180: Add sleep state for alc5682 codec

Add sleep state to acl5682. In default, gpio28 (HP_IRQ) is bias-pull-up.
To save power, in the new sleep state, gpio28 is bias-disable.

sleeping, /sys/kernel/debug/gpio shows gpio28 as "no pull". When codec
is awake (microphone plugged in and in use), it shows gpio28 as "pull up".

Signed-off-by: Joseph S. Barrera III <joebar@...omium.org>
---

 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index b5f534db135a..94dd6c34d997 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -755,8 +755,9 @@ hp_i2c: &i2c9 {
 	alc5682: codec@1a {
 		compatible = "realtek,rt5682i";
 		reg = <0x1a>;
-		pinctrl-names = "default";
+		pinctrl-names = "default", "sleep";
 		pinctrl-0 = <&hp_irq>;
+		pinctrl-1 = <&hp_sleep>;
 
 		#sound-dai-cells = <1>;
 
@@ -1336,6 +1337,18 @@ pinconf {
 		};
 	};
 
+	hp_sleep: hp-sleep {
+		pinmux {
+			pins = "gpio28";
+			function = "gpio";
+		};
+
+		pinconf {
+			pins = "gpio28";
+			bias-disable;
+		};
+	};
+
 	pen_irq_l: pen-irq-l {
 		pinmux {
 			pins = "gpio21";
-- 
2.31.0