linux-kernel - Re: [PATCH 2/2] regulator: palmas: model SMPS10 as two regulators

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Message-ID: <51C2DEEB.9090600@nvidia.com>
Date:	Thu, 20 Jun 2013 16:22:27 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	"broonie@...nel.org" <broonie@...nel.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	Stephen Warren <swarren@...dia.com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"ian@...mlogic.co.uk" <ian@...mlogic.co.uk>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] regulator: palmas: model SMPS10 as two regulators

On Thursday 20 June 2013 02:07 PM, Kishon Vijay Abraham I wrote:
> SMPS10 has two outputs OUT1 and OUT2 and have one input IN1.
> SMPS10-OUT2 is connected to SMPS10-IN1 and can be configured either
> in BOOST mode or BYPASS mode. regulator_enable of SMPS10-OUT2 configures
> it in BOOST mode. For BYPASS mode regulator_allow_bypass() API can be
> used. SMPS10-OUT1 is connected to SMPS10-OUT2 and can be enabled using
> regulator_enable().
>
> Cc: Laxman Dewangan <ldewangan@...dia.com>
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>   drivers/regulator/palmas-regulator.c |   39 ++++++++++++++++++++++++++++++----
>   include/linux/mfd/palmas.h           |    9 ++++----
>   2 files changed, 40 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
> index 3ae44ac..7004bab 100644
> --- a/drivers/regulator/palmas-regulator.c
> +++ b/drivers/regulator/palmas-regulator.c
> @@ -97,7 +97,12 @@ static const struct regs_info palmas_regs_info[] = {
>   		.ctrl_addr	= PALMAS_SMPS9_CTRL,
>   	},
>   	{
> -		.name		= "SMPS10",
> +		.name		= "SMPS10_OUT1",
> +		.sname		= "smps10-out2",
> +		.ctrl_addr	= PALMAS_SMPS10_CTRL,
> +	},
> +	{
> +		.name		= "SMPS10_OUT2",
>   		.sname		= "smps10-in",
>

This sequence can create regulator to be never register.
In probe, we register regulator from 0 to max_id.
Here smps10-out1 comes first and see the supply as smps10-out2 which is 
not registered yet and so will fail with PROBE_DEFER
When again it tries, the same issue.

I think we need to reverse the sequence, SMPS10-OUT2 and then SMPS10-OUT1.


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