linux-kernel - Re: [PATCH v5 1/3] dt-bindings: pwm: Add Xilinx AXI Timer

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Date:   Tue, 20 Jul 2021 17:45:32 -0400
From:   Sean Anderson <sean.anderson@...o.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Alvaro Gamez <alvaro.gamez@...ent.com>,
        linux-kernel@...r.kernel.org,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        linux-arm-kernel@...ts.infradead.org,
        Thierry Reding <thierry.reding@...il.com>,
        devicetree@...r.kernel.org, michal.simek@...inx.com,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH v5 1/3] dt-bindings: pwm: Add Xilinx AXI Timer



On 7/20/21 9:11 AM, Rob Herring wrote:
> On Mon, 19 Jul 2021 18:13:20 -0400, Sean Anderson wrote:
>> This adds a binding for the Xilinx LogiCORE IP AXI Timer. This device is a
>> "soft" block, so it has some parameters which would not be configurable in
>> most hardware. This binding is usually automatically generated by Xilinx's
>> tools, so the names and values of some properties should be kept as they
>> are, if possible. In addition, this binding is already in the kernel at
>> arch/microblaze/boot/dts/system.dts, and in user software such as QEMU.
>> 
>> The existing driver uses the clock-frequency property, or alternatively the
>> /cpus/timebase-frequency property as its frequency input. Because these
>> properties are deprecated, they have not been included with this schema.
>> All new bindings should use the clocks/clock-names properties to specify
>> the parent clock.
>> 
>> Because we need to init timer devices so early in boot, we determine if we
>> should use the PWM driver or the clocksource/clockevent driver by the
>> presence/absence, respectively, of #pwm-cells. Because both counters are
>> used by the PWM, there is no need for a separate property specifying which
>> counters are to be used for the PWM.
>> 
>> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
>> ---
>> 
>> Changes in v5:
>> - Update commit message to reflect revisions
>> - Fix indentation lint
>> - Add example for timer binding
>> - Remove xlnx,axi-timer-2.0 compatible string
>> - Move schema into the timer directory
>> 
>> Changes in v4:
>> - Remove references to generate polarity so this can get merged
>> - Predicate PWM driver on the presence of #pwm-cells
>> - Make some properties optional for clocksource drivers
>> 
>> Changes in v3:
>> - Mark all boolean-as-int properties as deprecated
>> - Add xlnx,pwm and xlnx,gen?-active-low properties.
>> - Make newer replacement properties mutually-exclusive with what they
>>   replace
>> - Add an example with non-deprecated properties only.
>> 
>> Changes in v2:
>> - Use 32-bit addresses for example binding
>> 
>>  .../bindings/timer/xlnx,xps-timer.yaml        | 91 +++++++++++++++++++
>>  1 file changed, 91 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml
>> 
> 
> My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> on your patch (DT_CHECKER_FLAGS is new in v5.13):
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> ./Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml: $id: relative path/filename doesn't match actual path or filename
> 	expected: http://devicetree.org/schemas/timer/xlnx,xps-timer.yaml#
> \ndoc reference errors (make refcheckdocs):

Ah, looks like I neglected to re-run tests after moving this file. Will fix in v6.

--Sean

> 
> See https://patchwork.ozlabs.org/patch/1507329
> 
> This check can fail if there are any dependencies. The base for a patch
> series is generally the most recent rc1.
> 
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
> 
> pip3 install dtschema --upgrade
> 
> Please check and re-submit.
>