From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sekhar Nori <nsekhar-l0cyMroinI0@public.gmane.org>
Subject: Re: [PATCH v5 10/44] clk: davinci: New driver for davinci PSC clocks
Date: Wed, 17 Jan 2018 17:55:16 +0530
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To: David Lechner <david-nq/r/kbU++upp/zk7JDF2g@public.gmane.org>, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org
Cc: Michael Turquette <mturquette-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>, Stephen Boyd <sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>, Kevin Hilman <khilman-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Adam Ford <aford173-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
List-Id: devicetree@vger.kernel.org

On Tuesday 16 January 2018 10:21 PM, David Lechner wrote:

>>> +static struct clk *davinci_psc_clk_register(const char *name,
>>> +                        const char *parent_name,
>>> +                        struct regmap *regmap,
>>> +                        u32 lpsc, u32 pd, u32 flags)
>>> +{
>>> +    struct clk_init_data init;
>>> +    struct davinci_psc_clk *psc;
>>> +    struct clk *clk;
>>> +
>>> +    psc = kzalloc(sizeof(*psc), GFP_KERNEL);
>>> +    if (!psc)
>>> +        return ERR_PTR(-ENOMEM);
>>> +
>>> +    init.name = name;
>>> +    init.ops = &davinci_psc_clk_ops;
>>> +    init.parent_names = (parent_name ? &parent_name : NULL);
>>> +    init.num_parents = (parent_name ? 1 : 0);
>>> +    init.flags = CLK_SET_RATE_PARENT;
>>
>> Is this needed since PSC does not cause any rate change?
> 
> Yes, because one of the PSCs is the ARM clock and for cpufreq, we
> need to propagate the rate change up the chain to SYSCLK6.

Good point. But how about treating that as an exception with a new LPSC_
quirk flag?

Thanks,
Sekhar
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