From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Boyd Subject: Re: [PATCH 08/13] clk: qcom: support for dynamic updating the PLL Date: Fri, 8 Dec 2017 16:18:27 -0800 Message-ID: <20171209001827.GG7997@codeaurora.org> References: <1506621050-10129-1-git-send-email-absahu@codeaurora.org> <1506621050-10129-9-git-send-email-absahu@codeaurora.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <1506621050-10129-9-git-send-email-absahu@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org To: Abhishek Sahu Cc: Michael Turquette , Andy Gross , David Brown , Rajendra Nayak , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, Taniya Das List-Id: linux-arm-msm@vger.kernel.org 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 > Signed-off-by: Taniya Das > Signed-off-by: Abhishek Sahu > --- Applied to clk-next -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project