linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am654-base-board: Add I2C I/O expander

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Message-ID: <d5d98e74-97cf-62fc-c72c-9081073708d2@ti.com>
Date:   Wed, 20 Sep 2023 09:47:27 +0530
From:   Ravi Gunasekaran <r-gunasekaran@...com>
To:     Andrew Davis <afd@...com>, <nm@...com>, <vigneshr@...com>
CC:     <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: ti: k3-am654-base-board: Add I2C I/O expander



On 9/19/23 5:51 PM, Andrew Davis wrote:
> On 9/19/23 12:03 AM, Ravi Gunasekaran wrote:
>> AM654 baseboard has two TCA9554 I/O expander on the WKUP_I2C0 bus.
>> The expander at address 0x38 is used to detect daughter cards.
>> Add a node for this I/O expander.
>>
>> Signed-off-by: Ravi Gunasekaran <r-gunasekaran@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-am654-base-board.dts | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
>> index f5c26e9fba98..035b20386ef3 100644
>> --- a/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
>> +++ b/arch/arm64/boot/dts/ti/k3-am654-base-board.dts
>> @@ -381,6 +381,13 @@
>>           interrupt-controller;
>>           #interrupt-cells = <2>;
>>       };
>> +
>> +    pca9554_1: gpio@38 {
> 
> As this is at a lower address than the other expander(39), why
> not put it before that one to keep these in order?

Sure. I will reorder the placement of nodes.

> 
> Also, do you need the label(pca9554_1:) for anything, if not
> drop it for now.

The label is not needed at the moment. I will drop the label.

Thanks for reviewing the patch. I will make the changes and post v2.

> 
> Andrew
> 
>> +        compatible = "nxp,pca9554";
>> +        reg = <0x38>;
>> +        gpio-controller;
>> +        #gpio-cells = <2>;
>> +    };
>>   };
>>     &mcu_i2c0 {
>>
>> base-commit: dfa449a58323de195773cf928d99db4130702bf7

-- 
Regards,
Ravi