From: Doug Anderson <dianders@chromium.org>
To: Rob Herring <robh+dt@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
Matthias Kaehlcke <mka@chromium.org>,
Andy Gross <agross@kernel.org>,
Rajendra Nayak <rnayak@codeaurora.org>,
Stephen Boyd <swboyd@chromium.org>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Mark Rutland <mark.rutland@arm.com>,
Daniel Lezcano <daniel.lezcano@linaro.org>
Subject: Re: [PATCH v2] dt-bindings: timer: Use non-empty ranges in example
Date: Fri, 17 Jan 2020 15:54:19 -0800 [thread overview]
Message-ID: <CAD=FV=Wg3gpLXz1+xxL_6Ki404+oXyma6NB33eps_Gs8R4LX4Q@mail.gmail.com> (raw)
In-Reply-To: <20200117155001.v2.1.I7dbd712cfe0bdf7b53d9ef9791072b7e9c6d3c33@changeid>
Hi,
On Fri, Jan 17, 2020 at 3:50 PM Douglas Anderson <dianders@chromium.org> wrote:
>
> On many arm64 qcom device trees, running `make dtbs_check` yells:
>
> timer@17c20000: #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@chromium.org>
> ---
> See:
> https://lore.kernel.org/r/20191212113540.7.Ia9bd3fca24ad34a5faaf1c3e58095c74b38abca1@changeid
>
> ...for the patch that sparked this change.
>
> Changes in v2:
> - Fixed my typo 0xf0000000 => 0xf0001000
>
> .../devicetree/bindings/timer/arm,arch_timer_mmio.yaml | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml b/Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml
> index b3f0fe96ff0d..b92d958d7541 100644
> --- a/Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml
> +++ b/Documentation/devicetree/bindings/timer/arm,arch_timer_mmio.yaml
> @@ -99,22 +99,22 @@ examples:
> compatible = "arm,armv7-timer-mem";
> #address-cells = <1>;
> #size-cells = <1>;
> - ranges;
> + ranges = <0 0xf0001000 0x1000>;
> reg = <0xf0000000 0x1000>;
> clock-frequency = <50000000>;
>
> - frame@f0001000 {
> + frame@0 {
> frame-number = <0>;
> interrupts = <0 13 0x8>,
> <0 14 0x8>;
> - reg = <0xf0001000 0x1000>,
> - <0xf0002000 0x1000>;
> + reg = <0x0000 0x1000>,
> + <0x1000 0x1000>;
> };
>
> frame@f0003000 {
> frame-number = <1>;
> interrupts = <0 15 0x8>;
> - reg = <0xf0003000 0x1000>;
> + reg = <0x2000 0x1000>;
Wow, how many stupid mistakes can I make in one small change? :( I
forgot to change the node name. v3 is now at:
https://lore.kernel.org/r/20200117155303.v3.1.I7dbd712cfe0bdf7b53d9ef9791072b7e9c6d3c33@changeid
-Doug
prev parent reply other threads:[~2020-01-17 23:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 23:50 [PATCH v2] dt-bindings: timer: Use non-empty ranges in example Douglas Anderson
2020-01-17 23:54 ` Doug Anderson [this message]
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