linux-kernel - Re: ACPI support in common clock framework

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Message-ID: <914341e7-ca94-054d-6127-522b745006b4@arm.com>
Date:   Mon, 25 Jun 2018 18:15:45 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Stephen Boyd <sboyd@...nel.org>,
        Srinath Mannam <srinath.mannam@...adcom.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: ACPI support in common clock framework



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@...nel.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