From: "H. Nikolaus Schaller" hns@goldelico.com
stable inclusion from linux-4.19.203 commit a6af9385fe59c73b60df6842d96059cff7151e31
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[ Upstream commit c68ef4ad180e09805fa46965d15e1dfadf09ffa5 ]
This device tree include file describes a fixed-regulator connecting smps7_reg output (1.8V) to some 1.8V rail and consumers (vdds_1v8_main).
This regulator does not physically exist.
I assume it was introduced as a wrapper around smps7_reg to provide a speaking signal name "vdds_1v8_main" as label.
This fixed-regulator without real function was not an issue in driver code until
Commit 98e48cd9283d ("regulator: core: resolve supply for boot-on/always-on regulators")
introduced a new check for regulator initialization which makes Palmas regulator registration fail:
[ 5.407712] ldo1: supplied by vsys_cobra [ 5.412748] ldo2: supplied by vsys_cobra [ 5.417603] palmas-pmic 48070000.i2c:palmas@48:palmas_pmic: failed to register 48070000.i2c:palmas@48:palmas_pmic regulator
The reason is that the supply-chain of regulators is too long and goes from ldo3 through the virtual vdds_1v8_main regulator and then back to smps7. This adds a cross-dependency of probing Palmas regulators and the fixed-regulator which leads to probe deferral by the new check and is no longer resolved.
Since we do not control what device tree files including this one reference (either &vdds_1v8_main or &smps7_reg or both) we keep both labels for smps7 for compatibility.
Fixes: 98e48cd9283d ("regulator: core: resolve supply for boot-on/always-on regulators") Signed-off-by: H. Nikolaus Schaller hns@goldelico.com Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- arch/arm/boot/dts/omap5-board-common.dtsi | 9 +-------- 1 file changed, 1 insertion(+), 8 deletions(-)
diff --git a/arch/arm/boot/dts/omap5-board-common.dtsi b/arch/arm/boot/dts/omap5-board-common.dtsi index 61a06f6add3ca..d1cb9ba080b25 100644 --- a/arch/arm/boot/dts/omap5-board-common.dtsi +++ b/arch/arm/boot/dts/omap5-board-common.dtsi @@ -33,14 +33,6 @@ regulator-max-microvolt = <5000000>; };
- vdds_1v8_main: fixedregulator-vdds_1v8_main { - compatible = "regulator-fixed"; - regulator-name = "vdds_1v8_main"; - vin-supply = <&smps7_reg>; - regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <1800000>; - }; - vmmcsd_fixed: fixedregulator-mmcsd { compatible = "regulator-fixed"; regulator-name = "vmmcsd_fixed"; @@ -490,6 +482,7 @@ regulator-boot-on; };
+ vdds_1v8_main: smps7_reg: smps7 { /* VDDS_1v8_OMAP over VDDS_1v8_MAIN */ regulator-name = "smps7";