linux-kernel - Re: [PATCH] clk: divider: fix clk_round_rate() when CLK_DIVIDER_READ_ONLY && CLK_RATE_SET

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Date:   Wed, 10 Jan 2018 14:03:33 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     David Lechner <david@...hnology.com>
Cc:     linux-clk@...r.kernel.org,
        Michael Turquette <mturquette@...libre.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: divider: fix clk_round_rate() when
 CLK_DIVIDER_READ_ONLY && CLK_RATE_SET_PARENT

On 01/06, David Lechner wrote:
> clk_round_rate() 'answers the question "if I were to pass @rate to
> clk_set_rate(), what clock rate would I end up with?" without changing
> the hardware'.
> 
> Currently, clk_divider_round_rate() returns the "current value" when
> divider->flags & CLK_DIVIDER_READ_ONLY. But, if CLK_SET_RATE_PARENT is
> set, then clk_set_rate() is supposed to propagate the rate change to the
> parent clock. So, we need to do check for CLK_SET_RATE_PARENT and if it
> is set, ask the parent clock what rate it can provide given the current
> divider value.
> 
> Signed-off-by: David Lechner <david@...hnology.com>

Jerome sent a patch the day before that probably addresses the
same thing. See the message-id of 20180105170959.17266-2-jbrunet@...libre.com
for more info.

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