linux-kernel - Re: [PATCH 0/7] ARM: davinci: add genpd support

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Date:   Sat, 17 Feb 2018 21:41:01 -0600
From:   David Lechner <david@...hnology.com>
To:     Sekhar Nori <nsekhar@...com>, Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Kevin Hilman <khilman@...nel.org>,
        Russell King <linux@...linux.org.uk>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: Re: [PATCH 0/7] ARM: davinci: add genpd support

On 02/09/2018 06:42 AM, Sekhar Nori wrote:
> Hi David,
> 
> On Thursday 08 February 2018 04:13 AM, David Lechner wrote:
>> On 02/07/2018 07:45 AM, Bartosz Golaszewski wrote:
>>> From: Bartosz Golaszewski <bgolaszewski@...libre.com>
>>>
>>> Hi Sekhar et al,
>>>
>>> please take a look at the following patches. They add a simple genpd
>>> driver and use it in DT mode on da850 boards.
>>>
>>> I was trying to use genpd in legacy mode too, but couldn't find neither
>>> any interfaces nor users that would do that. For now I added a check in
>>> arch/arm/mach-davinci/pm_domain.c that disables the clock pm setup if
>>> we're using genpd.
>>>
>>> This series applies on top of and has been tested with David Lechner's
>>> for-bartosz branch. It fixes the clock look-up issues we faced with
>>> lcdc and emac.
>>
>> I'm starting to think that it makes more sense to just make the PSC driver
>> a power-domain and reset provider rather than a clock provider. It is
>> unfortunate that genpd is DT only.
> 
> This will mean that the only way to enable clocks on DaVinci is to use
> pm_runtime() calls. We do still have drivers which depend on clk api for
> enabling clocks, so I am not sure its feasible just yet.
> 
> I think a question like this can arise for any gate clock.
> 

I've incorporated parts of this series into my v7 work in progress
using the suggestions I made about using the existing PSC device
as the power domain provider.