linux-kernel - Re: [RFC 06/12] Clk: qcom: support for dynamic updating the PLL

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Message-ID: <20170728183428.GH2146@codeaurora.org>
Date:   Fri, 28 Jul 2017 11:34:28 -0700
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     mturquette@...libre.com, andy.gross@...aro.org,
        david.brown@...aro.org, rnayak@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 06/12] Clk: qcom: support for dynamic updating the PLL

On 07/27, Abhishek Sahu wrote:
> Some of the Alpha PLL’s support dynamic update in which the
> frequency can be changed dynamically without turning off the PLL.
> 
> This dynamic update requires the following sequence
> 
> 1. Write the desired values to pll_l_val and pll_alpha_val.
> 2. Toggle pll_latch_input from low to high.
> 3. Wait for pll_ack_latch to transition from low to high.
>    The new L and alpha values have been latched. It make
>    take some time for the PLL to fully settle with these
>    new values.
> 4. Pull pll_latch_input low.
> 
> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>

I think Rajendra has a similar patch that was sent. Is this the
same? Can you please look on the list and find it and compare?

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