On 19/09/2024 09:13, Ryan Chen wrote: >> Subject: Re: [PATCH v3 1/4] dt-bindings: mfd: aspeed: support for AST2700 >> >> On 19/09/2024 08:05, Ryan Chen wrote: >>>>> diff --git >>>>> a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml >>>>> b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml >>>>> index 86ee69c0f45b..127a357051cd 100644 >>>>> --- a/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml >>>>> +++ b/Documentation/devicetree/bindings/mfd/aspeed,ast2x00-scu.yaml >>>>> @@ -9,6 +9,8 @@ title: Aspeed System Control Unit >>>>> description: >>>>> The Aspeed System Control Unit manages the global behaviour of >>>>> the >>>> SoC, >>>>> configuring elements such as clocks, pinmux, and reset. >>>>> + In AST2700 SOC which has two soc connection, each soc have its >>>>> + own scu register control, ast2700-scu0 for soc0, ast2700-scu1 for >> soc1. >>>>> >>>>> maintainers: >>>>> - Joel Stanley <joel@xxxxxxxxx> >>>>> @@ -21,6 +23,8 @@ properties: >>>>> - aspeed,ast2400-scu >>>>> - aspeed,ast2500-scu >>>>> - aspeed,ast2600-scu >>>>> + - aspeed,ast2700-scu0 >>>>> + - aspeed,ast2700-scu1 >>>>> - const: syscon >>>>> - const: simple-mfd >>>>> >>>>> @@ -30,10 +34,12 @@ properties: >>>>> ranges: true >>>>> >>>>> '#address-cells': >>>>> - const: 1 >>>>> + minimum: 1 >>>>> + maximum: 2 >>>>> >>>>> '#size-cells': >>>>> - const: 1 >>>>> + minimum: 1 >>>>> + maximum: 2 >>>> >>>> Why do the children have 64 bit addressing? >>> >>> AST2700 is 64bit address, so it also. >> >> But why do they need it? >> > Sorry, I may not understand your point. I asked why do you think children require 64-bit addressing, instead of working with existing 32-bit address. > Since address-cell = <2>, Do you mean size-cell still 1? No... although that's another point, how bug address size is there? For the children? > If yes. I do the dts check it need size-cells=<2>, when I do address-cells = <2> Well, I talk about bus and children addressing. It's kind of obvious that changing one property means using different reg... Best regards, Krzysztof
