linux-kernel - Re: [PATCH 2/2] mfd: palmas: get rid of of_platform

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Date:	Wed, 27 Feb 2013 14:36:34 +0000
From:	Graeme Gregory <gg@...mlogic.co.uk>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"broonie@...nsource.wolfsonmicro.com" 
	<broonie@...nsource.wolfsonmicro.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stephen Warren <swarren@...dia.com>,
	"ian@...mlogic.co.uk" <ian@...mlogic.co.uk>
Subject: Re: [PATCH 2/2] mfd: palmas: get rid of of_platform_populate() in
 DT registration

On 27/02/13 14:26, Laxman Dewangan wrote:
> On Wednesday 27 February 2013 07:51 PM, Graeme Gregory wrote:
>> On 27/02/13 14:08, Laxman Dewangan wrote:
>>> If driver is getting registered through DT then it look for
>>> population of platform data which is not possible if platform
>>> completely support the DT.
>> No it doesnt!
>>> In this case, if device is registered through DT then just ignore
>>> platform data population and continue the further registration.
>>> Signed-off-by: Laxman Dewangan <ldewangan@...dia.com>
>>> ---
>>>   drivers/mfd/palmas.c |   21 +++++++++------------
>>>   1 files changed, 9 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/drivers/mfd/palmas.c b/drivers/mfd/palmas.c
>>> index 25f0eab..6771d9b 100644
>>> --- a/drivers/mfd/palmas.c
>>> +++ b/drivers/mfd/palmas.c
>>> @@ -465,18 +465,6 @@ static int palmas_i2c_probe(struct i2c_client
>>> *i2c,
>>>       if (ret)
>>>           goto err_irq;
>>>   -    /*
>>> -     * If we are probing with DT do this the DT way and return here
>>> -     * otherwise continue and add devices using mfd helpers.
>>> -     */
>>> -    if (node) {
>>> -        ret = of_platform_populate(node, NULL, NULL, &i2c->dev);
>>> -        if (ret < 0)
>>> -            goto err_irq;
>>> -        else
>>> -            return ret;
>>> -    }
>>> -
>> At this point we exit the function and do nothing with the platform data
>> which should work on wholy DT systems. I have tested it!
>
>
> I think then dt files are different in this case. I did not saw the
> documentation of dt file.
> But following is my entry in dts file which we follow for other devices:
>
>         i2c@...0d000 {
>                 status = "okay";
>                 clock-frequency = <100000>;
>
>   ::::::::::::::
>                 tps65913@58 {
>                         compatible = "ti,palmas";
>                         reg = <0x58>;
>                         interrupts = <0 86 0x4>;
>
>                         #interrupt-cells = <2>;
>                         interrupt-controller;
>
>                         #gpio-cells = <2>;
>                         gpio-controller;
>
>                         regulators {
>                                 smps12 {
>                                         regulator-name = "palmas-smps12";
>                                         regulator-min-microvolt =
> <1350000>;
>                                         regulator-max-microvolt =
> <1350000>;
>                                         regulator-always-on;
>                                         regulator-boot-on;
>                                 };
>
>                                 smps3 {
>                                         regulator-name = "palmas-smps3";
>                                         regulator-min-microvolt =
> <1800000>;
>                                         regulator-max-microvolt =
> <1800000>;
>                                         regulator-always-on;
>                                         regulator-boot-on;
>                                 };
> :::::::::::::::
>                     };
>             };
>     };
>
>
> In the above DT file, it does not work.
>
>
I did slip up and forget to push the documentation file, it has since
started the upstream here

http://article.gmane.org/gmane.linux.documentation/9491/match=palmas+dts

The design of the palmas was to make it properly hierarchical to stop
nasty hacks like accessing parent of parent. As a MFD children should
not be tightly bonded to the MFD device!
 
Graeme

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