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Cc:     "Rafael J. Wysocki" <rafael@kernel.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
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        Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: Re: ACPI support in common clock framework
To:     Stephen Boyd <sboyd@kernel.org>,
        Srinath Mannam <srinath.mannam@broadcom.com>
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From:   Sudeep Holla <sudeep.holla@arm.com>
Organization: ARM
Message-ID: <914341e7-ca94-054d-6127-522b745006b4@arm.com>
Date:   Mon, 25 Jun 2018 18:15:45 +0100
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On 25/06/18 17:37, Stephen Boyd wrote:
> Quoting Rafael J. Wysocki (2018-06-16 08:50:18)
>> On Fri, Jun 15, 2018 at 7:43 PM, Stephen Boyd <sboyd@kernel.org> wrote:
>>>
>>> Is this for clk_enable/disable? What about clk_set_rate() or
>>> clk_set_phase()? Is ACPI's AML taking care of that?
>>
>> That's for clk_enable/disable AFAICS.
>>
>> AML doesn't manage device performance states at all.
> 
> Alright. We may need to add a better way for device drivers to get
> handles to clk pointers on ACPI firmware so they can change frequencies
> or phase, etc. 

Is there any specific usecase/device needing this in the kernel ? SPI
slaves ?

> Right now it's all through clkdev and it looks to be
> mostly based on string matching of connection names instead of
> associating clks with devices.
> 
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-- 
Regards,
Sudeep