linux-kernel - Re: [PATCH] ARM: dts: omap3-n900: Specify peripherals LDO regulators initial mode

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Date:	Sun, 17 Apr 2016 02:05:36 +0200
From:	Sebastian Reichel <sre@...nel.org>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	tony@...mide.com, bcousson@...libre.com, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux@....linux.org.uk, linux-omap@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: omap3-n900: Specify peripherals LDO regulators
 initial mode

Hi Ivo,

On Sat, Apr 16, 2016 at 09:37:23AM +0300, Ivaylo Dimitrov wrote:
> Without that, regulators are left in the mode last set by the bootloader or
> by the kernel the device was rebooted from. This leads to various problems
> like non-working peripherals.
> 
> Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
> ---
>  arch/arm/boot/dts/omap3-n900.dts | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
> index b3c26a9..1bb36e2 100644
> --- a/arch/arm/boot/dts/omap3-n900.dts
> +++ b/arch/arm/boot/dts/omap3-n900.dts
> @@ -329,6 +329,7 @@
>  	regulator-name = "V28";
>  	regulator-min-microvolt = <2800000>;
>  	regulator-max-microvolt = <2800000>;
> +	regulator-initial-mode = <0x0e>;
>  	regulator-always-on; /* due to battery cover sensor */
>  };

I think this should either get an additional
comment like /* MODE_NORMAL */ or implemented
using a define and a TWL4030_REGULATOR_MODE_NORMAL
constant to keep the *.dts easily readable.

-- Sebastian

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