linux-kernel - Re: [PATCH v3 1/5] reset: add reset-simple to unify socfpga, stm32, sunxi, and zx2967

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Message-ID: <d6b20df2-12f7-68b1-f7de-0c7f205eba13@suse.de>
Date:   Wed, 16 Aug 2017 14:12:32 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     Andre Przywara <andre.przywara@....com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-kernel@...r.kernel.org
Cc:     Alexandru Gagniuc <alex.g@...ptrum.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Baoyou Xie <baoyou.xie@...aro.org>,
        Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
        Steffen Trumtrar <s.trumtrar@...gutronix.de>,
        Dinh Nguyen <dinguyen@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, kernel@...gutronix.de
Subject: Re: [PATCH v3 1/5] reset: add reset-simple to unify socfpga, stm32,
 sunxi, and zx2967

Hi Andre,

Am 16.08.2017 um 13:30 schrieb Andre Przywara:
> On 16/08/17 10:46, Philipp Zabel wrote:
>> +/**
>> + * struct reset_simple_devdata - simple reset controller properties
>> + * @active_low: if true, bits are cleared to assert the reset. Otherwise, bits
>> + *              are set to assert the reset.
>> + */
>> +struct reset_simple_devdata {
>> +	bool active_low;
>> +};
>> +
>> +static const struct reset_simple_devdata reset_simple_active_low = {
>> +	.active_low = true,
>> +};
>> +
>> +static const struct of_device_id reset_simple_dt_ids[] = {
>> +	{ .compatible = "allwinner,sun6i-a31-clock-reset",
>> +		.data = &reset_simple_active_low },
> 
> Can we have a additional generic compatible string here? New users of
> this driver then wouldn't need to explicitly enter their name into the
> driver, but could just use the generic name as a fallback. This would
> enable the driver without any Linux code change just by adding a DT node.
> 
> 	compatible = "nexell,s5p6818-reset", "simple-reset";
> 
> Whenever we need a quirk (now or in the future), we can add the specific
> name into this structure along with the required workarounds.

Same question about binding here. However the way it is done today, we
would also need some optional active-low property then or two different
compatible strings, as this is currently controlled via the DT matches.

Regards,
Andreas

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