linux-kernel - Re: [RFC PATCH v3 9/9] arm64: dts: lx2160a: fix FlexSPI clock

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Message-ID: <20201108212139.ht22zdk27pyxv6wc@skbuf>
Date:   Sun, 8 Nov 2020 21:21:40 +0000
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Michael Walle <michael@...le.cc>
CC:     "linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>, Leo Li <leoyang.li@....com>,
        "Y.b. Lu" <yangbo.lu@....com>, Xiaowei Bao <xiaowei.bao@....com>,
        Ashish Kumar <ashish.kumar@....com>
Subject: Re: [RFC PATCH v3 9/9] arm64: dts: lx2160a: fix FlexSPI clock

On Sun, Nov 08, 2020 at 07:51:13PM +0100, Michael Walle wrote:
> Now that we have a proper driver for the FlexSPI interface use it. This
> will fix SCK frequency switching on Layerscape SoCs.
> 
> Signed-off-by: Michael Walle <michael@...le.cc>
> ---
> Thanks to Vladimir Oltean, this was partially tested on a LX2160A RDB. But
> this patch is marked as RFC nonetheless, because there is too much
> difference in the clock tree between LS1028A and LX2160A. It would be nice
> if someone could test it and add a Tested-by.

You want someone to probe the SCK frequency? I expect that if frequency
switching works on LS1028A, and the lx2160a_flexspi_divs table is
correct (which, based on the documentation for FlexSPICR1[FlexSPI_CLK_DIV],
it is), then it would work on LX2160A too?
Is there a simple test that can be made in order to trivially determine
whether the frequencies are correct?