linux-kernel - Re: [PATCH 1/3] arm64: dts: ti: k3-j7200-main: Add gpio nodes in main domain

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Date:   Fri, 13 Nov 2020 23:59:39 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Nishanth Menon <nm@...com>, Faiz Abbas <faiz_abbas@...com>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <t-kristo@...com>,
        <robh+dt@...nel.org>, Grygorii Strashko <grygorii.strashko@...com>
Subject: Re: [PATCH 1/3] arm64: dts: ti: k3-j7200-main: Add gpio nodes in main
 domain

Hi Nishanth,

On 12/11/20 10:09 PM, Nishanth Menon wrote:
> On 00:41-20201103, Faiz Abbas wrote:
>> There are 4 instances of gpio modules in main domain:
>> 	gpio0, gpio2, gpio4 and gpio6
>>
>> Groups are created to provide protection between different processor virtual
>> worlds. Each of these modules I/O pins are muxed within the group. Exactly
>> one module can be selected to control the corresponding pin by selecting it
>> in the pad mux configuration registers.
> Could you check with checkpatch --strict please?
> 
> I see:
> 
> WARNING: Possible unwrapped commit description (prefer a maximum 75 chars per line)
> 
>>
>> This group pins out 69 lines (5 banks).
>>
>> Add DT modes for each module instance in the main domain.
>>
>> Signed-off-by: Faiz Abbas <faiz_abbas@...com>
>> ---
>>  arch/arm64/boot/dts/ti/k3-j7200-main.dtsi | 68 +++++++++++++++++++++++
> 
> dtbs_check: we added:
> arch/arm64/boot/dts/ti/k3-j7200-main.dtsi: /bus@...000/gpio@...000: Missing #address-cells in interrupt provider
> arch/arm64/boot/dts/ti/k3-j7200-main.dtsi: /bus@...000/gpio@...000: Missing #address-cells in interrupt provider
> arch/arm64/boot/dts/ti/k3-j7200-main.dtsi: /bus@...000/gpio@...000: Missing #address-cells in interrupt provider
> arch/arm64/boot/dts/ti/k3-j7200-main.dtsi: /bus@...000/gpio@...000: Missing #address-cells in interrupt provider

Hmm, running dtbs_check, I did not really see this. These are all the
warnings I see for TI platforms: https://pastebin.ubuntu.com/p/m2my62mjQq/

The tree I am testing is linux-next of 12th Nov + these three patches
applied.

Also, #address-cells for interrupt provider being compulsory does not
make full sense to me. Nothing in
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt or
Documentation/devicetree/bindings/gpio/gpio-davinci.txt suggests that as
well.

Existing GPIO nodes for AM654 or J721E does not have #address-cells as well.

Adding Grygorii as well, in case he knows more about this.

Thanks,
Sekhar