linux-kernel - Re: [PATCH V3] clk: imx7ulp: make it easy to change ARM core clk

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Message-ID: <20200414133639.GC30676@dragon>
Date:   Tue, 14 Apr 2020 21:36:40 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     peng.fan@....com
Cc:     sboyd@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, linux-imx@....com, aisheng.dong@....com,
        abel.vesa@....com, Anson.Huang@....com, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3] clk: imx7ulp: make it easy to change ARM core clk

On Mon, Mar 16, 2020 at 04:32:33PM +0800, peng.fan@....com wrote:
> From: Peng Fan <peng.fan@....com>
> 
> ARM clk could only source from divcore or hsrun_divcore.
> 
> Follow what we already used on i.MX7D and i.MX8M SoCs, use
> imx_clk_hw_cpu API. When ARM core is running normaly,
> whether divcore or hwrun_divcore will finally source
> from SPLL_PFD0. However SPLL_PFD0 is marked with CLK_SET_GATE,
> so we need to disable SPLL_PFD0, when configure the rate.
> So add CORE and HSRUN_CORE virtual clk to make it easy to
> configure the clk using imx_clk_hw_cpu API.
> 
> Since CORE and HSRUN_CORE already marked with CLK_IS_CRITICAL, no
> need to set ARM as CLK_IS_CRITICAL. And when set the rate of ARM clk,
> prograting it the parent with CLK_SET_RATE_PARENT will finally set
> the SPLL_PFD0 clk.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

Applied, thanks.