Re: [PATCH 3/7] pwm: dwc: add of/platform support

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On 13/07/2022 16:07, Uwe Kleine-König wrote:
On Wed, Jul 13, 2022 at 03:30:07PM +0100, Ben Dooks wrote:
On 13/07/2022 14:52, Uwe Kleine-König wrote:
On Wed, Jul 13, 2022 at 12:56:55PM +0100, Ben Dooks wrote:
On 12/07/2022 23:17, Rob Herring wrote:
On Tue, Jul 12, 2022 at 11:01:09AM +0100, Ben Dooks wrote:
The dwc pwm controller can be used in non-PCI systems, so allow
either platform or OF based probing.

Signed-off-by: Ben Dooks <ben.dooks@xxxxxxxxxx>

[snip]

+properties:
+  "#pwm-cells":
+    description: |
+      See pwm.yaml in this directory for a description of the cells format.

pwm.yaml doesn't define how many cells. You need to. And you don't need
generic descriptions.

   "#pwm-cells":
      const: 1

should be sufficient then?

I would expect a value of (at least) 2 or (better) 3.

OOPS, forgot the phandle.

I will have to check if we have any support yet for dealing
with any of the pwm flags yet.

I didn't double check, but given that the driver only supports inversed
polarity it might not even work without passing the flag for inversed
polarity. Having said that, I expect you have to only add "#pwm-cells =
<3>;" to your dts and then everything should work just fine.

I hadn't noticed, but we've been testing with the sysfs interface
as we're using qemu.




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