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

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Message-ID: <51C31537.9030705@nvidia.com>
Date:	Thu, 20 Jun 2013 20:14:07 +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>,
	"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 07:49 PM, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Thursday 20 June 2013 07:33 PM, Laxman Dewangan wrote:
>> On Thursday 20 June 2013 07:20 PM, Kishon Vijay Abraham I wrote:
>>> Hi,
>>>
>>> On Thursday 20 June 2013 04:22 PM, Laxman Dewangan wrote:
>>>> 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.
>>> hmm.. But I was able to get (regulator_get) *SMPS10_OUT1* without any issue
>>> during my testing. From looking at the code, I couldn't see *sname* being used
>>> anywhere.
>> We used the sname as
>> pmic->desc[id].supply_name = palmas_regs_info[id].sname;
>>
>> However, how you have populated your dt?
>> Have you added like
>> smps10-out2-supply = <&SMPS10_OUT2>
>>
>> for the palmas regualtor -dt.
> I added the regulator data like
>
> +                       smps10_out1_reg: smps10_out1 {
> +                               regulator-name = "smps10_out1";
> +                               regulator-min-microvolt = <5000000>;
> +                               regulator-max-microvolt = <5000000>;
> +                               regulator-always-on;
> +                               regulator-boot-on;
> +                               regulator-allow-bypass;
> +                               ti,warm_sleep = <0>;
> +                               ti,roof_floor = <0>;
> +                               ti,mode_sleep = <0>;
> +                               ti,warm_reset = <0>;
> +                               ti,tstep = <0>;
> +                               ti,vsel = <0>;
> +                       };
>
> and from my controller I reference it using
> +               vbus-supply = <&smps10_out1_reg>;
>
> and in the controller driver I use
> +               vbus_reg = devm_regulator_get(dev, "vbus");

Have you added the regulator supply entries?
Are you testing on mainline linux-next?

I have DT entry as:
                 palmas: tps65913@58 {
                         compatible = "ti,palmas";
                         reg = <0x58>;
                         interrupts = <0 86 0x4>;

                 :::::::::::::::;
                         palmas_pmic {
                             compatible = "ti,palmas-pmic";
                             smps1-in-supply = <&tps65090_dcdc3_reg>;
                             smps3-in-supply = <&tps65090_dcdc3_reg>;
                             smps4-in-supply = <&tps65090_dcdc2_reg>;
  :::::::::;

			smps10-out2-supply = <&SMPS10_OUT2>
:::::::::::::;
}

And it fails.



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