linux-kernel - Re: [PATCH v3] clk: imx8mq: Mark AHB clock as critical

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Date:   Sat, 3 Aug 2019 17:04:36 +0200
From:   Shawn Guo <shawnguo@...nel.org>
To:     Abel Vesa <abel.vesa@....com>
Cc:     Mike Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sascha Hauer <kernel@...gutronix.de>,
        Fabio Estevam <fabio.estevam@....com>,
        Guido Gunther <agx@...xcpu.org>,
        Anson Huang <anson.huang@....com>, linux-clk@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] clk: imx8mq: Mark AHB clock as critical

On Tue, Jul 30, 2019 at 10:22:55AM +0300, Abel Vesa wrote:
> Initially, the TMU_ROOT clock was marked as critical, which automatically
> made the AHB clock to stay always on. Since the TMU_ROOT clock is not
> marked as critical anymore, following commit:
> 
> 431bdd1df48e ("clk: imx8mq: Remove CLK_IS_CRITICAL flag for IMX8MQ_CLK_TMU_ROOT")

The commit ID is not stable before the commit actually lands mainline.
I could possibly rebase the branch.

> 
> all the clocks that derive from ipg_root clock (and implicitly ahb clock)
> would also have to enable, along with their own gate, the AHB clock.
> 
> But considering that AHB is actually a bus that has to be always on, we mark
> it as critical in the clock provider driver and then all the clocks that
> derive from it can be controlled through the dedicated per IP gate which
> follows after the ipg_root clock.
> 
> Signed-off-by: Abel Vesa <abel.vesa@....com>
> Tested-by: Daniel Baluta <daniel.baluta@....com>
> Fixes: 431bdd1df48e ("clk: imx8mq: Remove CLK_IS_CRITICAL flag for IMX8MQ_CLK_TMU_ROOT")

Dropped commit ID above and Fixes tag here, and applied the patch. 

Thanks for the fixing.

Shawn