lkml.org 
[lkml]   [2021]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH v2] omap5-board-common: remove not physically existing vdds_1v8_main fixed-regulator
From
Date
Any comments?

> Am 01.07.2021 um 16:00 schrieb H. Nikolaus Schaller <hns@goldelico.com>:
>
> 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>
> ---
> 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 d8f13626cfd1..3a8f10231475 100644
> --- a/arch/arm/boot/dts/omap5-board-common.dtsi
> +++ b/arch/arm/boot/dts/omap5-board-common.dtsi
> @@ -30,14 +30,6 @@ vsys_cobra: fixedregulator-vsys_cobra {
> 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";
> @@ -487,6 +479,7 @@ smps6_reg: smps6 {
> regulator-boot-on;
> };
>
> + vdds_1v8_main:
> smps7_reg: smps7 {
> /* VDDS_1v8_OMAP over VDDS_1v8_MAIN */
> regulator-name = "smps7";
> --
> 2.31.1
>

\
 
 \ /
  Last update: 2021-07-14 09:34    [W:0.053 / U:0.504 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site