linux-kernel - [PATCH v2 2/6] arm64: dts: qcom: sa8295p-adp: Specify which LDO modes are allowed

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Message-Id: <20220829094903.v2.2.I430a56702ab0af65244e62667bb7743107de0c96@changeid>
Date:   Mon, 29 Aug 2022 09:49:48 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Johan Hovold <johan@...nel.org>,
        Andrew Halaney <ahalaney@...hat.com>,
        Mark Brown <broonie@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Andy Gross <agross@...nel.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/6] arm64: dts: qcom: sa8295p-adp: Specify which LDO modes are allowed

This board uses RPMH, specifies "regulator-allow-set-load" for LDOs,
but doesn't specify any modes with "regulator-allowed-modes".

Prior to commit efb0cb50c427 ("regulator: qcom-rpmh: Implement
get_optimum_mode(), not set_load()") the above meant that we were able
to set either LPM or HPM mode. After that commit (and fixes [1]) we'll
be stuck at the initial mode. Discussion of this has resulted in the
decision that the old dts files were wrong and should be fixed to
fully restore old functionality.

Let's re-enable the old functionality by fixing the dts.

[1] https://lore.kernel.org/r/20220824142229.RFT.v2.2.I6f77860e5cd98bf5c67208fa9edda4a08847c304@changeid

Fixes: 519183af39b2 ("arm64: dts: qcom: add SA8540P and ADP")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
Reviewed-by: Andrew Halaney <ahalaney@...hat.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@...ainline.org>
---

Changes in v2:
- Rebased atop ("...: sa8295p-adp: disallow regulator mode switches")

 arch/arm64/boot/dts/qcom/sa8295p-adp.dts | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sa8295p-adp.dts b/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
index ca5f5ad32ce5..5b16ac76fefb 100644
--- a/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
+++ b/arch/arm64/boot/dts/qcom/sa8295p-adp.dts
@@ -83,6 +83,9 @@ vreg_l3c: ldo3 {
 			regulator-max-microvolt = <1200000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 			regulator-allow-set-load;
+			regulator-allowed-modes =
+			    <RPMH_REGULATOR_MODE_LPM
+			     RPMH_REGULATOR_MODE_HPM>;
 		};
 
 		vreg_l4c: ldo4 {
@@ -98,6 +101,9 @@ vreg_l6c: ldo6 {
 			regulator-max-microvolt = <1200000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 			regulator-allow-set-load;
+			regulator-allowed-modes =
+			    <RPMH_REGULATOR_MODE_LPM
+			     RPMH_REGULATOR_MODE_HPM>;
 		};
 
 		vreg_l7c: ldo7 {
@@ -113,6 +119,9 @@ vreg_l10c: ldo10 {
 			regulator-max-microvolt = <2504000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 			regulator-allow-set-load;
+			regulator-allowed-modes =
+			    <RPMH_REGULATOR_MODE_LPM
+			     RPMH_REGULATOR_MODE_HPM>;
 		};
 
 		vreg_l17c: ldo17 {
@@ -121,6 +130,9 @@ vreg_l17c: ldo17 {
 			regulator-max-microvolt = <2504000>;
 			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
 			regulator-allow-set-load;
+			regulator-allowed-modes =
+			    <RPMH_REGULATOR_MODE_LPM
+			     RPMH_REGULATOR_MODE_HPM>;
 		};
 	};
 
-- 
2.37.2.672.g94769d06f0-goog