linux-kernel - Re: [PATCH v2] clk: imx: Set CLK_SET_RATE

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Date:   Wed, 18 Apr 2018 10:32:16 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Abel Vesa <abel.vesa@....com>
Cc:     Fabio Estevam <fabio.estevam@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-kernel@...r.kernel.org,
        Abel Vesa <abelvesa@...ux.com>, linux-imx@....com,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] clk: imx: Set CLK_SET_RATE_GATE for gate and divider
 clocks

On Wed, Apr 11, 2018 at 05:03:29PM +0300, Abel Vesa wrote:
> From: Shawn Guo <shawnguo@...nel.org>
> 
> Add flag CLK_SET_RATE_GATE for i.MX gate and divider clocks on which the
> client drivers usually make clk_set_rate() call, so that the call will fail
> when clock is still on instead of standing the risk of running into glitch
> issue. Rate cannot be changed when the clock is enabled due to the glitchy
> multiplexers.
> 
> Signed-off-by: Shawn Guo <shawnguo@...nel.org>
> [initial patch from imx internal repo]
> Signed-off-by: Abel Vesa <abel.vesa@....com>
> [carried over from 3.14 and also applied the flag to newer functions]
> ---
> 
> Changes since v1:
>  - changed ownership as per initial patch

IIRC, the patch was created on vendor kernel long time ago to work
around a specific glitchy multiplexer issue seen on particular SoC.
I'm not sure it's good for the upstream kernel today.

Shawn