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Message-ID: <20221115100251.7hwpnodgxzirgpw6@pengutronix.de>
Date: Tue, 15 Nov 2022 11:02:51 +0100
From: Marco Felsch <m.felsch@...gutronix.de>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: shawnguo@...nel.org, s.hauer@...gutronix.de,
Peng Fan <peng.fan@....com>, linux-kernel@...r.kernel.org,
linux-imx@....com, kernel@...gutronix.de, festevam@...il.com,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V5 07/12] arm64: dts: imx8mn-evk: update vdd_soc dvs
voltage
Hi Peng,
On 22-11-15, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
>
> Per schematic, BUCK1 is for VDD_SOC&DRAM&PU_0V9. The nxp,dvs-run-voltage
> and nxp,dvs-standby-voltage need set for BUCK1, not BUCK2.
> BUCK2 is for A53, which is handled by DVFS, so no need dvs property.
>
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
> arch/arm64/boot/dts/freescale/imx8mn-evk.dts | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> index 4eb467df5ba7..a5a7d74ec1d5 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mn-evk.dts
> @@ -47,6 +47,8 @@ buck1: BUCK1{
> regulator-boot-on;
> regulator-always-on;
> regulator-ramp-delay = <3125>;
> + nxp,dvs-run-voltage = <950000>;
One last question on this. According the schematic the max should be
0.88/0.945V and you are going to set it to 0.950V.
According the driver the nxp,dvs-run-voltage is just the same as the
normal regulator voltage. So I would suggest to just use the
nxp,dvs-standby-voltage property to enable the DVS feature since the run
voltage is already handled by the
regulator-min-microvolt/regulator-max-microvolt. So it would be just:
> + nxp,dvs-standby-voltage = <750000>;
Regards,
Marco
> };
>
> buck2: BUCK2 {
> @@ -56,8 +58,6 @@ buck2: BUCK2 {
> regulator-boot-on;
> regulator-always-on;
> regulator-ramp-delay = <3125>;
> - nxp,dvs-run-voltage = <950000>;
> - nxp,dvs-standby-voltage = <850000>;
> };
>
> buck4: BUCK4{
> --
> 2.37.1
>
>
>
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