linux-kernel - Re: [PATCH 08/13] clk: qcom: support for dynamic updating the PLL

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Message-ID: <20171209001827.GG7997@codeaurora.org>
Date:   Fri, 8 Dec 2017 16:18:27 -0800
From:   Stephen Boyd <sboyd@...eaurora.org>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org,
        Taniya Das <tdas@...eaurora.org>
Subject: Re: [PATCH 08/13] clk: qcom: support for dynamic updating the PLL

On 09/28, 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: Rajendra Nayak <rnayak@...eaurora.org>
> Signed-off-by: Taniya Das <tdas@...eaurora.org>
> Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>
> ---

Applied to clk-next

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