linux-kernel - Re: [PATCH v4] reset: add support for non-DT systems

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Message-ID: <CAMRc=MfAvuQHf52Exs4MxG=sKJibTd8dZEbBED4_HAOah2c3kw@mail.gmail.com>
Date:   Fri, 23 Feb 2018 12:41:43 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     David Lechner <david@...hnology.com>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Sekhar Nori <nsekhar@...com>,
        Kevin Hilman <khilman@...libre.com>
Subject: Re: [PATCH v4] reset: add support for non-DT systems

2018-02-22 17:44 GMT+01:00 David Lechner <david@...hnology.com>:
> On 02/22/2018 05:34 AM, Philipp Zabel wrote:
>>
>> On Tue, 2018-02-20 at 10:40 -0600, David Lechner wrote:
>> [...]
>>>>
>>>> In your case the platform code that adds the lookup may be identical to
>>>> the code that registers the struct reset_controller_dev, but that
>>>> doesn't have to be the case. I'm not sure how that is supposed to work
>>>> for the phy framework (I see no platform code adding phy lookups, only
>>>> drivers).
>>>>
>>> In our use case, we would be adding the lookup in the driver rather than
>>> in the platform code, which is why I am suggesting doing it like the phy
>>> framework.
>>
>>
>> Shouldn't it be the job of the platform code to describe the connections
>> between reset controller and peripheral module reset
>> inputs?
>
>
>
> I guess that depends on who you ask. There are many clock driver that
> register clkdev lookups in drivers/clk/, so that is what we have done
> with the clock driver we are working on. The clock device is also the
> reset controller, so it makes sense to me to register the reset lookup
> in the same place that we are registering the clkdev lookup.
>
> We have a platform_device_id for each possible configuration, so that
> it works very much like the device tree compatible string. You register
> a platform device in the board file with the proper name and the driver
> takes care of the reset because it knows which connections there are
> based on the device name.

I sent another attempt. Since the in-progress psc driver has all the
clocks in the driver code, it makes sense to do the same for resets.

Bart