linux-kernel - Re: [PATCH v1 2/2] arm64: dts: exynos: keep LDO12 always-on

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Message-ID: <20200705182306.GA13827@kozik-lap>
Date:   Sun, 5 Jul 2020 20:23:06 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Alim Akhtar <alim.akhtar@...sung.com>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org
Subject: Re: [PATCH v1 2/2] arm64: dts: exynos: keep LDO12 always-on

On Sun, Jul 05, 2020 at 12:39:18PM +0530, Alim Akhtar wrote:
> LDO12 on exynos7 supply power to VDDQ_UFS20_RESET,
> in case this regulator is OFF, UFS host controller
> can not send command to UFS device. To keep this supply
> ON, set regulator-always-on property for this ldo.

Why UFS does not take any supplies? This looks like a workaround for the
case of not implementing any consumer.

Best regards,
Krzysztof


> 
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  arch/arm64/boot/dts/exynos/exynos7-espresso.dts | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> index bb86950032d3..92fecc539c6c 100644
> --- a/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> +++ b/arch/arm64/boot/dts/exynos/exynos7-espresso.dts
> @@ -194,6 +194,7 @@
>  				regulator-min-microvolt = <1000000>;
>  				regulator-max-microvolt = <1300000>;
>  				regulator-enable-ramp-delay = <125>;
> +				regulator-always-on;
>  			};
>  
>  			ldo13_reg: LDO13 {
> -- 
> 2.17.1
>