From: Stephen Boyd <sboyd@codeaurora.org>
To: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Michael Turquette <mturquette@baylibre.com>,
linux-clk@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH 0/2] clk: renesas: Use CLK_IS_CRITICAL to handle critical clocks
Date: Fri, 20 Jan 2017 15:00:00 -0800 [thread overview]
Message-ID: <20170120230000.GC8009@codeaurora.org> (raw)
In-Reply-To: <1484657190-12838-1-git-send-email-geert+renesas@glider.be>
On 01/17, Geert Uytterhoeven wrote:
> Hi Mike, Stephen,
>
> This patch series adds support for the CLK_IS_CRITICAL flag to drivers
> for module clocks on Renesas ARM SoCs. For now, this is used to prevent
> disabling of the ARM GIC module clock, which would lead to a system
> lock-up when accessing the GIC's registers.
>
> 1. The first patch migrates the Renesas CPG/MSSR driver from the
> never merged CLK_ENABLE_HAND_OFF flag to the CLK_IS_CRITICAL flag.
> Note that as the driver already handled critical clocks (i.e. it
> ignored them :-), this is not a prerequisite for linking the GIC to
> its module clock in DT.
>
> 2. The second patch makes sure the CLK_IS_CRITICAL flag is set for the
> INTC-SYS clock on SoCs not (yet) using the Renesas CPG/MSSR driver.
> Note that this is a hard dependency for describing the INTC-SYS
> clock in DT on R-Mobile APE6 and R-Car Gen2.
>
> I plan to queue these patches in my clk-renesas-for-v4.11 branch, if
> you agree.
>
Would the runtime PM patches for ccf make things any better here?
I still plan to support CLK_ENABLE_HAND_OFF somehow, but it's not
at the top of my priority list right now.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2017-01-20 23:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-17 12:46 [PATCH 0/2] clk: renesas: Use CLK_IS_CRITICAL to handle critical clocks Geert Uytterhoeven
2017-01-17 12:46 ` [PATCH 1/2] clk: renesas: cpg-mssr: Migrate to CLK_IS_CRITICAL Geert Uytterhoeven
2017-01-20 23:00 ` Stephen Boyd
2017-01-17 12:46 ` [PATCH 2/2] clk: renesas: mstp: Make INTC-SYS a critical clock Geert Uytterhoeven
2017-01-20 23:12 ` Stephen Boyd
2017-01-23 9:50 ` Geert Uytterhoeven
2017-01-20 23:00 ` Stephen Boyd [this message]
2017-01-23 9:34 ` [PATCH 0/2] clk: renesas: Use CLK_IS_CRITICAL to handle critical clocks Geert Uytterhoeven
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