[9/9] arm64: dts: imx8mn-bsh-smm-s2-common: Disable PMIC SNVS reset target state
diff mbox series

Message ID 20250514082507.1983849-10-dario.binacchi@amarulasolutions.com
State New
Headers show
Series
  • DTS updates for BSH SMM S2[PRO] boards
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Commit Message

Dario Binacchi May 14, 2025, 8:25 a.m. UTC 
From: Wolfgang Birkner <wolfgang.birkner@bshg.com>

VDD_DRAM was disabled on standby, therefore the reference hardware did not
wake up reliable. Use PMIC reset target state READY instead of SNVS, to
keep VDD_DRAM active during standby.

Signed-off-by: Wolfgang Birkner <wolfgang.birkner@bshg.com>
Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>

---

 arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi | 1 -
 1 file changed, 1 deletion(-)

Comments

Matti Vaittinen May 15, 2025, 9:28 a.m. UTC | #1 
On 14/05/2025 11:25, Dario Binacchi wrote:
> From: Wolfgang Birkner <wolfgang.birkner@bshg.com>
> 
> VDD_DRAM was disabled on standby, therefore the reference hardware did not
> wake up reliable. Use PMIC reset target state READY instead of SNVS, to
> keep VDD_DRAM active during standby.

There is something I'm not quite sure I understand. Lookin at the 
BD71847 data-sheet, the VDD_DRAM is OFF at READY.

(Page 27, Table 3-8. Voltage Rails ON/OFF for Respective Power State)

https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator_system/bd71847amwv-e.pdf

Please, explain.

Yours,
	-- Matti

> 
> Signed-off-by: Wolfgang Birkner <wolfgang.birkner@bshg.com>
> Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
> 
> ---
> 
>   arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> index ea8d741c6904..633874b3bf66 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
> @@ -94,7 +94,6 @@ bd71847: pmic@4b {
>   		pinctrl-0 = <&pinctrl_pmic>;
>   		interrupt-parent = <&gpio1>;
>   		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
> -		rohm,reset-snvs-powered;
>   
>   		#clock-cells = <0>;
>   		clocks = <&osc_32k>;

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Patch
diff mbox series 

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
index ea8d741c6904..633874b3bf66 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-bsh-smm-s2-common.dtsi
@@ -94,7 +94,6 @@  bd71847: pmic@4b {
 		pinctrl-0 = <&pinctrl_pmic>;
 		interrupt-parent = <&gpio1>;
 		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
-		rohm,reset-snvs-powered;
 
 		#clock-cells = <0>;
 		clocks = <&osc_32k>;