On Mon, Aug 26, 2024 at 01:15:43PM +0300, claudiu beznea wrote: > > > On 23.08.2024 19:33, Conor Dooley wrote: > > 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 > > That's true. > > > 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, > > That's true. > > it just won't register a reset controller? > > It will register it but, > > the new sysc driver is going to probe only for this SoC (RZ/G3S). On RZ/G3S > we have 2 resets. These well be registered unconditionally, currently, only > for RZ/G3S. If there will be no DT users for it then it should be no > problem, AFAICT. Okay, sounds it doesn't break for existing devicetrees. Acked-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> Thanks, Conor.
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