linux-kernel - Re: [PATCH 02/16] dt-bindings: soc: renesas: renesas,rzg2l-sysc: Add #reset-cells for RZ/G3S

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Message-ID: <20240823-plywood-unfixed-d8d8a2d93f14@spud>
Date: Fri, 23 Aug 2024 17:18:04 +0100
From: Conor Dooley <conor@...nel.org>
To: claudiu beznea <claudiu.beznea@...on.dev>
Cc: vkoul@...nel.org, kishon@...nel.org, robh@...nel.org,
	krzk+dt@...nel.org, conor+dt@...nel.org, p.zabel@...gutronix.de,
	geert+renesas@...der.be, magnus.damm@...il.com,
	gregkh@...uxfoundation.org, mturquette@...libre.com,
	sboyd@...nel.org, yoshihiro.shimoda.uh@...esas.com,
	biju.das.jz@...renesas.com, ulf.hansson@...aro.org,
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
	linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-clk@...r.kernel.org, linux-pm@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
Subject: Re: [PATCH 02/16] dt-bindings: soc: renesas: renesas,rzg2l-sysc: Add
 #reset-cells for RZ/G3S

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@...renesas.com>
> >>
> >> 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@...renesas.com>
> >> ---
> >>  .../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.
What's worth noting isn't about the prior SoCs, it is about what makes
it okay for this one.

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