linux-kernel - Re: [PATCH v3 04/17] dt-bindings: soc: mobileye: add EyeQ5 OLB system controller

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Date: Thu, 25 Jan 2024 08:51:55 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Herring <robh@...nel.org>, Théo Lebrun
 <theo.lebrun@...tlin.com>
Cc: Gregory CLEMENT <gregory.clement@...tlin.com>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Linus Walleij <linus.walleij@...aro.org>, Rafał Miłecki
 <rafal@...ecki.pl>, Philipp Zabel <p.zabel@...gutronix.de>,
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
 linux-mips@...r.kernel.org, linux-clk@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, linux-gpio@...r.kernel.org
Subject: Re: [PATCH v3 04/17] dt-bindings: soc: mobileye: add EyeQ5 OLB system
 controller

On 24/01/2024 16:14, Rob Herring wrote:
>> +
>> +      pinctrl-b {
>> +        compatible = "mobileye,eyeq5-b-pinctrl";
>> +        #pinctrl-cells = <1>;
>> +      };
>> +    };
> 
> This can all be simplified to:
> 
> system-controller@...000 {
>     compatible = "mobileye,eyeq5-olb", "syscon";
>     reg = <0xe00000 0x400>;
>     #reset-cells = <2>;
>     #clock-cells = <1>;
>     clocks = <&xtal>;
>     clock-names = "ref";
> 
>     pins { ... };
> };
> 
> There is no need for sub nodes unless you have reusable blocks or each 
> block has its own resources in DT.

Yes, however I believe there should be resources here: each subnode
should get its address space. This is a bit tied to implementation,
which currently assumes "everyone can fiddle with everything" in this block.

Theo, can you draw memory map?

Best regards,
Krzysztof