linux-kernel - Re: [PATCH v1] ARM: dts: omap3-n900: Specify peripherals LDO regulators initial mode

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Date:	Tue, 19 Apr 2016 17:18:33 -0400
From:	Javier Martinez Canillas <javier@...hile0.org>
To:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Benoit Cousson <bcousson@...libre.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Sebastian Reichel <sre@...nel.org>
Subject: Re: [PATCH v1] ARM: dts: omap3-n900: Specify peripherals LDO
 regulators initial mode

Hello Ivaylo,

On Sun, Apr 17, 2016 at 10:29 AM, Ivaylo Dimitrov
<ivo.g.dimitrov.75@...il.com> 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..d9e2d9c 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>; /* RES_STATE_ACTIVE */

As Sebastian said, it would be nice if instead of magic numbers +
comments, we have defines for the modes by moving the definitions from
include/linux/i2c/twl.h to include/dt-bindings/regulator/ so they can
be used by DTS.

But that can be done as a follow-up though, to avoid adding a
dependency between the regulator and arm-soc subsystems to get this
fix applied.

Reviewed-by: Javier Martinez Canillas <javier@....samsung.com>

Best regards,
Javier