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From:   Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
To:     agross@kernel.org, bjorn.andersson@linaro.org, robh+dt@kernel.org,
        krzysztof.kozlowski+dt@linaro.org, linux-arm-msm@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     quic_msavaliy@quicinc.com, dianders@chromium.org,
        Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
Subject: [V3 2/3] arch: arm64: dts: qcom: Configure cts sleep pinctrl to bias-bus-hold
Date:   Wed,  6 Apr 2022 12:46:01 +0530
Message-Id: <1649229362-31183-3-git-send-email-quic_vnivarth@quicinc.com>
In-Reply-To: <1649229362-31183-1-git-send-email-quic_vnivarth@quicinc.com>
References: <1649229362-31183-1-git-send-email-quic_vnivarth@quicinc.com>
Precedence: bulk

WLAN rail was leaking power during RBSC/sleep even after turning BT off.
Change sleep pinctrl configuration to handle same.

Signed-off-by: Vijaya Krishna Nivarthi <quic_vnivarth@quicinc.com>
---
v3: apply same change to active state and other sc7280*.dts* as well
v2: used bias-bus-hold as per review comments
v1: intial patch used bias-disable for sleep pinctrl in sc7280-idp only
---
 arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts b/arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts
index 1779d96..eb43ce5 100644
--- a/arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts
+++ b/arch/arm64/boot/dts/qcom/sc7280-herobrine-herobrine-r0.dts
@@ -859,10 +859,10 @@ ap_ec_spi: &spi8 {
 
 &qup_uart7_cts {
 	/*
-	 * Configure a pull-down on CTS to match the pull of
-	 * the Bluetooth module.
+	 * Configure a bias-bus-hold on CTS to lower power usage
+	 * when BT is turned off.
 	 */
-	bias-pull-down;
+	bias-bus-hold;
 };
 
 &qup_uart7_rts {
@@ -1267,10 +1267,10 @@ ap_ec_spi: &spi8 {
 		pins = "gpio28";
 		function = "gpio";
 		/*
-		 * Configure a pull-down on CTS to match the pull of
-		 * the Bluetooth module.
+		 * Configure a bias-bus-hold on CTS to lower power usage
+		 * when BT is turned off.
 		 */
-		bias-pull-down;
+		bias-bus-hold;
 	};
 
 	qup_uart7_sleep_rts: qup-uart7-sleep-rts {
-- 
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