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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Marijn Suijten <marijn.suijten@somainline.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.19 0226/1157] arm64: dts: qcom: sdm845-akatsuki: Round down l22a regulator voltage
Date:   Mon, 15 Aug 2022 19:53:02 +0200
Message-Id: <20220815180448.622647005@linuxfoundation.org>
In-Reply-To: <20220815180439.416659447@linuxfoundation.org>
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From: Marijn Suijten <marijn.suijten@somainline.org>

[ Upstream commit 4148a9eeb15152865d60b0913d96beb7ca166f9a ]

2700000 is not a multiple of pmic4_pldo's step size of 8000 (with base
voltage 1664000), resulting in pm8998-rpmh-regulators not probing.  Just
as we did with MSM8998's Sony Yoshino Poplar [1], round the voltages
down to err on the cautious side and leave a comment in place to
document this discrepancy wrt downstream sources.

[1]: https://lore.kernel.org/linux-arm-msm/20220507153627.1478268-1-marijn.suijten@somainline.org/

Fixes: 30a7f99befc6 ("arm64: dts: qcom: Add support for SONY Xperia XZ2 / XZ2C / XZ3 (Tama platform)")
Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220620211212.269956-1-marijn.suijten@somainline.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
index 8a0d94e7f598..2f5e12deaada 100644
--- a/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
+++ b/arch/arm64/boot/dts/qcom/sdm845-sony-xperia-tama-akatsuki.dts
@@ -19,8 +19,9 @@ &vreg_l14a_1p8 {
 };
 
 &vreg_l22a_2p8 {
-	regulator-min-microvolt = <2700000>;
-	regulator-max-microvolt = <2700000>;
+	/* Note: Round-down from 2700000 to be a multiple of PLDO step-size 8000 */
+	regulator-min-microvolt = <2696000>;
+	regulator-max-microvolt = <2696000>;
 };
 
 &vreg_l28a_2p8 {
-- 
2.35.1