Hi, Shawn
Although the commit 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for switch") is reverted to avoid the boot failure on some i.MX platforms, but adding the "regulator-always-on" property for those pfuze's critical switches are the right way and making sense, no matter how the pfuze regulator's switch ON/OFF function will be implemented, below patches should can be applied anyway?
ARM: dts: imx6sll-evk: make pfuze100 sw4 always on
ARM: dts: make pfuze switch always-on for imx platforms
ARM: dts: imx6sl-evk: keep sw4 always on
Let me know your thoughts, thanks!
Anson Huang
Best Regards!
> -----Original Message-----
> From: Anson Huang
> Sent: Wednesday, June 27, 2018 9:31 AM
> To: shawnguo@xxxxxxxxxx; s.hauer@xxxxxxxxxxxxxx; kernel@xxxxxxxxxxxxxx;
> Fabio Estevam <fabio.estevam@xxxxxxx>; robh+dt@xxxxxxxxxx;
> mark.rutland@xxxxxxx
> Cc: dl-linux-imx <linux-imx@xxxxxxx>; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: [PATCH V2] ARM: dts: make pfuze switch always-on for imx platforms
>
> commit 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for switch")
> will cause those unreferenced switches being turned off if
> "regulator-always-on" is NOT present, as pfuze switches are normally used by
> critical modules which must be always ON or shared by many peripherals which
> do NOT implement power domain control, so just make sure all switches
> always ON to avoid any system issue caused by unexpectedly turning off
> switches.
>
> Fixes: 5fe156f1cab4 ("regulator: pfuze100: add enable/disable for switch")
> Signed-off-by: Anson Huang <Anson.Huang@xxxxxxx>
> Reviewed-by: Fabio Estevam <fabio.estevam@xxxxxxx>
> ---
> changes since V1:
> improve the way of referencing commit, and add fix tag.
> arch/arm/boot/dts/imx6q-display5.dtsi | 1 +
> arch/arm/boot/dts/imx6q-mccmon6.dts | 1 +
> arch/arm/boot/dts/imx6q-novena.dts | 1 +
> arch/arm/boot/dts/imx6q-pistachio.dts | 1 +
> arch/arm/boot/dts/imx6qdl-gw54xx.dtsi | 1 +
> arch/arm/boot/dts/imx6qdl-sabresd.dtsi | 1 +
> arch/arm/boot/dts/imx6sx-sdb-reva.dts | 1 +
> 7 files changed, 7 insertions(+)
>
> diff --git a/arch/arm/boot/dts/imx6q-display5.dtsi
> b/arch/arm/boot/dts/imx6q-display5.dtsi
> index 85232c7..33d266f 100644
> --- a/arch/arm/boot/dts/imx6q-display5.dtsi
> +++ b/arch/arm/boot/dts/imx6q-display5.dtsi
> @@ -326,6 +326,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> diff --git a/arch/arm/boot/dts/imx6q-mccmon6.dts
> b/arch/arm/boot/dts/imx6q-mccmon6.dts
> index b7e9f38..e6429c5 100644
> --- a/arch/arm/boot/dts/imx6q-mccmon6.dts
> +++ b/arch/arm/boot/dts/imx6q-mccmon6.dts
> @@ -166,6 +166,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> diff --git a/arch/arm/boot/dts/imx6q-novena.dts
> b/arch/arm/boot/dts/imx6q-novena.dts
> index fcd824d..0b3c651 100644
> --- a/arch/arm/boot/dts/imx6q-novena.dts
> +++ b/arch/arm/boot/dts/imx6q-novena.dts
> @@ -341,6 +341,7 @@
> reg_sw4: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> reg_swbst: swbst {
> diff --git a/arch/arm/boot/dts/imx6q-pistachio.dts
> b/arch/arm/boot/dts/imx6q-pistachio.dts
> index a31e83c..6ea09f9 100644
> --- a/arch/arm/boot/dts/imx6q-pistachio.dts
> +++ b/arch/arm/boot/dts/imx6q-pistachio.dts
> @@ -253,6 +253,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> diff --git a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> index a1a6fb5..281cae5 100644
> --- a/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-gw54xx.dtsi
> @@ -268,6 +268,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> diff --git a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> index 15744ad..6e46a19 100644
> --- a/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> +++ b/arch/arm/boot/dts/imx6qdl-sabresd.dtsi
> @@ -341,6 +341,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> diff --git a/arch/arm/boot/dts/imx6sx-sdb-reva.dts
> b/arch/arm/boot/dts/imx6sx-sdb-reva.dts
> index e3533e7..9cc6ff2 100644
> --- a/arch/arm/boot/dts/imx6sx-sdb-reva.dts
> +++ b/arch/arm/boot/dts/imx6sx-sdb-reva.dts
> @@ -63,6 +63,7 @@
> sw4_reg: sw4 {
> regulator-min-microvolt = <800000>;
> regulator-max-microvolt = <3300000>;
> + regulator-always-on;
> };
>
> swbst_reg: swbst {
> --
> 2.7.4
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