linux-kernel - Re: [PATCH v3] dt-bindings: timer: Use non-empty ranges in example

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Message-ID: <20200122161315.GA23684@bogus>
Date:   Wed, 22 Jan 2020 10:13:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>, mka@...omium.org,
        Andy Gross <agross@...nel.org>,
        Rajendra Nayak <rnayak@...eaurora.org>, swboyd@...omium.org,
        Douglas Anderson <dianders@...omium.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Mark Rutland <mark.rutland@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v3] dt-bindings: timer: Use non-empty ranges in example

On Fri, 17 Jan 2020 15:53:26 -0800, Douglas Anderson wrote:
> On many arm64 qcom device trees, running `make dtbs_check` yells:
> 
>   timer@...20000: #size-cells:0:0: 1 was expected
> 
> It appears that someone was trying to assert the fact that sub-nodes
> describing frames would never have a size that's more than 32-bits
> big.  That does indeed appear to be true for all cases I could find.
> 
> Currently many arm64 qcom device tree files have a #address-cells and
> about in commit bede7d2dc8f3 ("arm64: dts: qcom: sdm845: Increase
> address and size cells for soc").  That means the only way we can
> shrink them down is to use a non-empty ranges.
> 
> Since forever it has said in "writing-bindings.txt" to "DO use
> non-empty 'ranges' to limit the size of child buses/devices".  I guess
> we should start listening to it.
> 
> I believe (but am not certain) that this also means that we should use
> "ranges" to simplify the "reg" of our sub devices by specifying an
> offset.  Let's update the example in the bindings to make this
> obvious.
> 
> Signed-off-by: Douglas Anderson <dianders@...omium.org>
> ---
> See:
>   https://lore.kernel.org/r/20191212113540.7.Ia9bd3fca24ad34a5faaf1c3e58095c74b38abca1@changeid
> 
> ...for the patch that sparked this change.
> 
> Changes in v3:
> - Fixed my typo frame@...03000 => frame@...0
> 
> Changes in v2:
> - Fixed my typo 0xf0000000 => 0xf0001000
> 
>  .../bindings/timer/arm,arch_timer_mmio.yaml          | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 

Applied, thanks.

Rob