On Fri, Aug 23, 2024 at 07:26:42PM +0300, claudiu beznea wrote: > On 23.08.2024 19:18, Conor Dooley wrote: > > On Fri, Aug 23, 2024 at 10:54:06AM +0300, claudiu beznea wrote: > >> Hi, Conor, > >> > >> On 22.08.2024 19:42, Conor Dooley wrote: > >>> On Thu, Aug 22, 2024 at 06:27:47PM +0300, Claudiu wrote: > >>>> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> > >>>> > >>>> The RZ/G3S System controller has registers to control signals that need > >>>> to be de-asserted/asserted before/after different SoC areas are power > >>>> on/off. This signals are implemented as reset signals. For this document > >>>> the #reset-cells property. > >>>> > >>>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx> > >>>> --- > >>>> .../bindings/soc/renesas/renesas,rzg2l-sysc.yaml | 16 ++++++++++++++++ > >>>> 1 file changed, 16 insertions(+) > >>>> > >>>> diff --git a/Documentation/devicetree/bindings/soc/renesas/renesas,rzg2l-sysc.yaml b/Documentation/devicetree/bindings/soc/renesas/renesas,rzg2l-sysc.yaml > >>>> index 4386b2c3fa4d..6b0bb34485d9 100644 > >>>> --- a/Documentation/devicetree/bindings/soc/renesas/renesas,rzg2l-sysc.yaml > >>>> +++ b/Documentation/devicetree/bindings/soc/renesas/renesas,rzg2l-sysc.yaml > >>>> @@ -42,12 +42,28 @@ properties: > >>>> - const: cm33stbyr_int > >>>> - const: ca55_deny > >>>> > >>>> + "#reset-cells": > >>>> + const: 1 > >>>> + > >>>> required: > >>>> - compatible > >>>> - reg > >>>> > >>>> additionalProperties: false > >>>> > >>>> +allOf: > >>>> + - if: > >>>> + properties: > >>>> + compatible: > >>>> + contains: > >>>> + const: renesas,r9a08g045-sysc > >>>> + then: > >>>> + required: > >>>> + - "#reset-cells" > >>> > >>> Given this is new required property on an existing platform, I'd expect > >>> some mention of why it used to be okay to not have this but is now > >>> required. Did firmware or a bootloader stage take things out of reset? > >> > >> On previous SoCs the SYS controller has no support for controlling the > >> signals going to different peripherals (USB, PCIE in case of RZ/G3S). > >> I'll add a note about this on next version. > > > > My initial thought here wasn't about previous SoCs though, it was > > because you didn't add the compatible in this series for /this/ SoC. > > RZ/G3S compatible is already present in this file: > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings/soc/renesas/renesas,rzg2l-sysc.yaml#n26 I know, first thing I did when I read the original patch was open the file ;) I don't care about the old SoCs, cos you're not applying the property to them, so what's changed between SoCs isn't really relevant. It's a mention of why, on this SoC, it is safe to add new required properties that I want. AFAIU the answer is that no consumer of the resets existed before, so there's not some special state there, and I am guessing that the new sysc driver you're adding isn't going to fail to probe if there are no resets, it just won't register a reset controller? Which is fine, cos all devicetrees that have the new peripherals will have #reset-cells etc. > > What's worth noting isn't about the prior SoCs, it is about what makes > > it okay for this one.
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