linux-kernel - Re: [PATCH 08/11] MIPS: mobileye: eyeq5: add OLB syscon node

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Message-ID: <6e3b02d9-9a1e-4fc0-9459-9c9c0d37aa92@linaro.org>
Date: Thu, 11 Apr 2024 17:07:23 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>,
 Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
 Linus Walleij <linus.walleij@...aro.org>
Cc: linux-mips@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-gpio@...r.kernel.org,
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
 Gregory CLEMENT <gregory.clement@...tlin.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 08/11] MIPS: mobileye: eyeq5: add OLB syscon node

On 11/04/2024 16:34, Théo Lebrun wrote:
> Hello,
> 
> On Thu Apr 11, 2024 at 8:15 AM CEST, Krzysztof Kozlowski wrote:
>> On 10/04/2024 19:12, Théo Lebrun wrote:
>>> The OLB ("Other Logic Block") is a syscon region hosting clock, reset
>>> and pin controllers. It contains registers such as I2C speed mode that
>>> need to be accessible by other nodes.
>>>
>>> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
>>> ---
>>>  arch/mips/boot/dts/mobileye/eyeq5.dtsi | 8 ++++++++
>>>  1 file changed, 8 insertions(+)
>>>
>>> diff --git a/arch/mips/boot/dts/mobileye/eyeq5.dtsi b/arch/mips/boot/dts/mobileye/eyeq5.dtsi
>>> index 6cc5980e2fa1..e82d2a57f6da 100644
>>> --- a/arch/mips/boot/dts/mobileye/eyeq5.dtsi
>>> +++ b/arch/mips/boot/dts/mobileye/eyeq5.dtsi
>>> @@ -100,6 +100,14 @@ uart2: serial@...000 {
>>>  			clock-names = "uartclk", "apb_pclk";
>>>  		};
>>>  
>>> +		olb: system-controller@...000 {
>>> +			compatible = "mobileye,eyeq5-olb", "syscon", "simple-mfd";
>>> +			reg = <0 0xe00000 0x0 0x400>;
>>> +			ranges = <0x0 0x0 0xe00000 0x400>;
>>> +			#address-cells = <1>;
>>> +			#size-cells = <1>;
>>
>> Do not add incomplete node. ranges, address/size-cells are incorrect in
>> this context and you will have warnings.
>>
>> Add complete node, so these properties make sense.
> 
> I'll squash all four commits into one. For reference, commits are:
> 
>  - MIPS: mobileye: eyeq5: add OLB syscon node
>  - MIPS: mobileye: eyeq5: use OLB clocks controller node
>  - MIPS: mobileye: eyeq5: add OLB reset controller node
>  - MIPS: mobileye: eyeq5: add pinctrl node & pinmux function nodes
> 
> This means two things: (1) it won't be partially applicable and (2) it

Why?

> will make one big commit adding pins and editing clocks.

It never was partially applicable. Causing warnings does not make things
partially applicable. If node is too big, although I personally do not
agree, it's quite moderate size chunk, then sure, split pinctrl groups
or pinctrl node to additional patch.

Best regards,
Krzysztof