linux-kernel - Re: [PATCH 5/6] arm64: tegra: Enable GPIO controllers nodes for P2972-0000 platform

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Date:   Mon, 25 Nov 2019 12:25:11 +0530
From:   Vidya Sagar <vidyas@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <lorenzo.pieralisi@....com>, <bhelgaas@...gle.com>,
        <robh+dt@...nel.org>, <jonathanh@...dia.com>,
        <andrew.murray@....com>, <kishon@...com>,
        <gustavo.pimentel@...opsys.com>, <linux-pci@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kthota@...dia.com>,
        <mmaddireddy@...dia.com>, <sagar.tv@...il.com>
Subject: Re: [PATCH 5/6] arm64: tegra: Enable GPIO controllers nodes for
 P2972-0000 platform

On 11/22/2019 6:50 PM, Thierry Reding wrote:
> On Fri, Nov 22, 2019 at 04:15:04PM +0530, Vidya Sagar wrote:
>> Enable GPIO controllers nodes for P2972-0000 platform which are required
>> by other controllers in the SoC for example when PCIe C5 controller
>> operates in endpoint mode.
>>
>> Signed-off-by: Vidya Sagar <vidyas@...dia.com>
>> ---
>>   arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts | 8 ++++++++
>>   1 file changed, 8 insertions(+)
> 
> The GPIO controllers are enabled by default, so there's no need to
> explicitly enable them.
Yup. I'll remove this patch.
Since I didn't see 'status' entry in GPIO nodes in tegra194.dtsi file, I thought
it means 'disabled'. But, contrary to my understanding, absence of 'status' entry
seems to mean 'okay'.

- Vidya Sagar
> 
> Thierry
> 
>>
>> diff --git a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> index 353a6a22196d..7eb64b816e08 100644
>> --- a/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> +++ b/arch/arm64/boot/dts/nvidia/tegra194-p2972-0000.dts
>> @@ -37,6 +37,14 @@
>>   			status = "okay";
>>   		};
>>   
>> +		gpio@...0000 {
>> +			status = "okay";
>> +		};
>> +
>> +		gpio@...0000 {
>> +			status = "okay";
>> +		};
>> +
>>   		pwm@...0000 {
>>   			status = "okay";
>>   		};
>> -- 
>> 2.17.1
>>