linux-kernel - Re: [PATCH 03/11] pinctrl: mvebu: kirkwood pinctrl driver

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Date:	Mon, 27 Aug 2012 13:02:32 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Linus Walleij <linus.walleij@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	Rob Landley <rob@...dley.net>,
	Russell King <linux@....linux.org.uk>,
	Lior Amsalem <alior@...vell.com>, Andrew Lunn <andrew@...n.ch>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 03/11] pinctrl: mvebu: kirkwood pinctrl driver

On 08/27/2012 12:19 PM, Sebastian Hesselbarth wrote:
> On 08/27/2012 03:43 PM, Ben Dooks wrote:
>> On 20/08/2012 06:49, Linus Walleij wrote:
>>> On Sat, Aug 11, 2012 at 2:56 PM, Sebastian Hesselbarth
>>> <sebastian.hesselbarth@...il.com> wrote:
>>> (...)
>>>> diff --git a/drivers/pinctrl/pinctrl-kirkwood.c
>>>> b/drivers/pinctrl/pinctrl-kirkwood.c
>>>> +static struct mvebu_pinctrl_soc_info kirkwood_pinctrl_info;
>>>> +
>>>> +static struct of_device_id kirkwood_pinctrl_of_match[] __devinitdata
>>>> = {
>>>> + { .compatible = "marvell,88f6180-pinctrl",
>>>> + .data = (void *)VARIANT_MV88F6180 },
>>>> + { .compatible = "marvell,88f6190-pinctrl",
>>>> + .data = (void *)VARIANT_MV88F6190 },
>>>> + { .compatible = "marvell,88f6192-pinctrl",
>>>> + .data = (void *)VARIANT_MV88F6192 },
>>>> + { .compatible = "marvell,88f6281-pinctrl",
>>>> + .data = (void *)VARIANT_MV88F6281 },
>>>> + { .compatible = "marvell,88f6282-pinctrl",
>>>> + .data = (void *)VARIANT_MV88F6282 },
>>>> + { }
>>>> +};
>>>
>>> I'm thinking this variant should maybe be an enum... unless it is
>>> strongly established somewhere in Orion/Marvell stuff.
>>>
>>>> +static int __devinit kirkwood_pinctrl_probe(struct platform_device
>>>> *pdev)
>>>> +{
>>>> + struct mvebu_pinctrl_soc_info *soc = &kirkwood_pinctrl_info;
>>>> + const struct of_device_id *match =
>>>> + of_match_device(kirkwood_pinctrl_of_match, &pdev->dev);
>>>> +
>>>> + if (match) {
>>>> + soc->variant = (unsigned)match->data & 0xff;
>>>> + switch (soc->variant) {
>>>> + case VARIANT_MV88F6180:
>>>> + soc->controls = mv88f6180_mpp_controls;
>>>> + soc->ncontrols = ARRAY_SIZE(mv88f6180_mpp_controls);
>>>> + soc->modes = mv88f6xxx_mpp_modes;
>>>> + soc->nmodes = ARRAY_SIZE(mv88f6xxx_mpp_modes);
>>>> + soc->gpioranges = mv88f6180_gpio_ranges;
>>>> + soc->ngpioranges = ARRAY_SIZE(mv88f6180_gpio_ranges);
>>>> + break;
>>>> + case VARIANT_MV88F6190:
>>>> + case VARIANT_MV88F6192:
>>>> + soc->controls = mv88f619x_mpp_controls;
>>>> + soc->ncontrols = ARRAY_SIZE(mv88f619x_mpp_controls);
>>>> + soc->modes = mv88f6xxx_mpp_modes;
>>>> + soc->nmodes = ARRAY_SIZE(mv88f6xxx_mpp_modes);
>>>> + soc->gpioranges = mv88f619x_gpio_ranges;
>>>> + soc->ngpioranges = ARRAY_SIZE(mv88f619x_gpio_ranges);
>>>> + break;
>>>> + case VARIANT_MV88F6281:
>>>> + case VARIANT_MV88F6282:
>>>> + soc->controls = mv88f628x_mpp_controls;
>>>> + soc->ncontrols = ARRAY_SIZE(mv88f628x_mpp_controls);
>>>> + soc->modes = mv88f6xxx_mpp_modes;
>>>> + soc->nmodes = ARRAY_SIZE(mv88f6xxx_mpp_modes);
>>>> + soc->gpioranges = mv88f628x_gpio_ranges;
>>>> + soc->ngpioranges = ARRAY_SIZE(mv88f628x_gpio_ranges);
>>>> + break;
>>>> + }
>>>> + pdev->dev.platform_data = soc;
>>>> + }
>>>> + return mvebu_pinctrl_probe(pdev);
>>>> +}
>>
>> Why not have structures defining the soc-> parameters and use that in the
>> of_match list?
> 
> Ben,
> 
> functionally it is equivalent and IMHO using soc structs doesn't improve
> readability here. I there any other good reason to have structs for each
> soc?

Well, it does change from 6 assignments down to one, and remove the need
for a switch statement - i.e. all of the code quoted above becomes just
roughly:

*soc = *match->data;

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