linux-kernel - Re: [PATCH 1/2] dt-bindings: gpio: Add Tegra410 support

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Message-ID: <f6c001af-bfaa-4d1a-8c32-1e2889e78650@nvidia.com>
Date: Mon, 29 Sep 2025 12:53:37 +0530
From: Kartik Rajput <kkartik@...dia.com>
To: Conor Dooley <conor@...nel.org>
Cc: linus.walleij@...aro.org, brgl@...ev.pl, thierry.reding@...il.com,
 jonathanh@...dia.com, robh@...nel.org, krzk+dt@...nel.org,
 conor+dt@...nel.org, linux-kernel@...r.kernel.org,
 linux-gpio@...r.kernel.org, linux-tegra@...r.kernel.org,
 devicetree@...r.kernel.org, Prathamesh Shete <pshete@...dia.com>
Subject: Re: [PATCH 1/2] dt-bindings: gpio: Add Tegra410 support

Hi Conor,

Thanks for reviewing the patch!

On 19/09/25 22:44, Conor Dooley wrote:
> On Fri, Sep 19, 2025 at 03:06:26PM +0530, Kartik Rajput wrote:
>> From: Prathamesh Shete <pshete@...dia.com>
>>
>> Add the port definitions for the main GPIO controller found on
>> Tegra410.
>>
>> Signed-off-by: Prathamesh Shete <pshete@...dia.com>
>> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
>> ---
> 
> Why are you modifying a binding header for devicetree when the driver
> only appear to grow acpi support?
> 

Although Tegra410 is ACPI-only and does not require a new compatible string,
we chose to add the GPIO port definitions to the DT binding header to stay
consistent with previous Tegra SoCs.

Thanks,
Kartik


>>   include/dt-bindings/gpio/tegra410-gpio.h | 37 ++++++++++++++++++++++++
>>   1 file changed, 37 insertions(+)
>>   create mode 100644 include/dt-bindings/gpio/tegra410-gpio.h
>>
>> diff --git a/include/dt-bindings/gpio/tegra410-gpio.h b/include/dt-bindings/gpio/tegra410-gpio.h
>> new file mode 100644
>> index 000000000000..e4d042fbacb2
>> --- /dev/null
>> +++ b/include/dt-bindings/gpio/tegra410-gpio.h
>> @@ -0,0 +1,37 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +/* Copyright (c) 2025, NVIDIA CORPORATION. All rights reserved. */
>> +
>> +/*
>> + * This header provides constants for the nvidia,tegra410-gpio DT binding.
>> + *
>> + * The first cell in Tegra's GPIO specifier is the GPIO ID. The macros below
>> + * provide names for this.
>> + *
>> + * The second cell contains standard flag values specified in gpio.h.
>> + */
>> +
>> +#ifndef _DT_BINDINGS_GPIO_TEGRA410_GPIO_H
>> +#define _DT_BINDINGS_GPIO_TEGRA410_GPIO_H
>> +
>> +#include <dt-bindings/gpio/gpio.h>
>> +
>> +/* GPIOs implemented by main GPIO controller */
>> +#define TEGRA410_MAIN_GPIO_PORT_A	0
>> +#define TEGRA410_MAIN_GPIO_PORT_B	1
>> +#define TEGRA410_MAIN_GPIO_PORT_C	2
>> +#define TEGRA410_MAIN_GPIO_PORT_D	3
>> +#define TEGRA410_MAIN_GPIO_PORT_E	4
>> +#define TEGRA410_MAIN_GPIO_PORT_I	5
>> +#define TEGRA410_MAIN_GPIO_PORT_J	6
>> +#define TEGRA410_MAIN_GPIO_PORT_K	7
>> +#define TEGRA410_MAIN_GPIO_PORT_L	8
>> +#define TEGRA410_MAIN_GPIO_PORT_M	9
>> +#define TEGRA410_MAIN_GPIO_PORT_N	10
>> +#define TEGRA410_MAIN_GPIO_PORT_P	11
>> +#define TEGRA410_MAIN_GPIO_PORT_Q	12
>> +#define TEGRA410_MAIN_GPIO_PORT_R	13
>> +
>> +#define TEGRA410_MAIN_GPIO(port, offset) \
>> +	((TEGRA410_MAIN_GPIO_PORT_##port * 8) + (offset))
>> +
>> +#endif
>> -- 
>> 2.43.0
>>