linux-kernel - Re: [PATCH] gpio: tegra186: Fix GPIO name collisions for Tegra410

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Message-ID: <c21580ab-8da8-4a0d-a575-4248c40a58ef@nvidia.com>
Date: Fri, 14 Nov 2025 10:09:48 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Kartik Rajput <kkartik@...dia.com>, linus.walleij@...aro.org,
 brgl@...ev.pl, thierry.reding@...il.com, pshete@...dia.com,
 nhartman@...dia.com, linux-gpio@...r.kernel.org,
 linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] gpio: tegra186: Fix GPIO name collisions for Tegra410


On 13/11/2025 16:31, Kartik Rajput wrote:
> On Tegra410, Compute and System GPIOs have same port names. This
> results in the same GPIO names for both Compute and System GPIOs
> during initialization in `tegra186_gpio_probe()`, which results in
> following warnings:
> 
>    kernel: gpio gpiochip1: Detected name collision for GPIO name 'PA.00'
>    kernel: gpio gpiochip1: Detected name collision for GPIO name 'PA.01'
>    kernel: gpio gpiochip1: Detected name collision for GPIO name 'PA.02'
>    kernel: gpio gpiochip1: Detected name collision for GPIO name 'PB.00'
>    kernel: gpio gpiochip1: Detected name collision for GPIO name 'PB.01'
>    ...
> 
> Add GPIO name prefix in the SoC data and use it to initialize the GPIO
> name.
> 
> Port names remain unchanged for previous SoCs. On Tegra410, Compute
> GPIOs are named COMPUTE-P<PORT>.GPIO, and System GPIOs are named
> SYSTEM-P<PORT>.GPIO.
> 
> Fixes: 9631a10083d8 ("gpio: tegra186: Add support for Tegra410")
> Signed-off-by: Kartik Rajput <kkartik@...dia.com>
> ---
>   drivers/gpio/gpio-tegra186.c | 11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
> index 83ecdc876985..b1498b59a921 100644
> --- a/drivers/gpio/gpio-tegra186.c
> +++ b/drivers/gpio/gpio-tegra186.c
> @@ -109,6 +109,7 @@ struct tegra_gpio_soc {
>   	const struct tegra_gpio_port *ports;
>   	unsigned int num_ports;
>   	const char *name;
> +	const char *prefix;
>   	unsigned int instance;
>   
>   	unsigned int num_irqs_per_bank;
> @@ -940,8 +941,12 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
>   		char *name;
>   
>   		for (j = 0; j < port->pins; j++) {
> -			name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL,
> -					      "P%s.%02x", port->name, j);
> +			if (gpio->soc->prefix)
> +				name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL, "%s-P%s.%02x",
> +						      gpio->soc->prefix, port->name, j);
> +			else
> +				name = devm_kasprintf(gpio->gpio.parent, GFP_KERNEL, "P%s.%02x",
> +						      port->name, j);
>   			if (!name)
>   				return -ENOMEM;
>   
> @@ -1306,6 +1311,7 @@ static const struct tegra_gpio_soc tegra410_compute_soc = {
>   	.num_ports = ARRAY_SIZE(tegra410_compute_ports),
>   	.ports = tegra410_compute_ports,
>   	.name = "tegra410-gpio-compute",
> +	.prefix = "COMPUTE",
>   	.num_irqs_per_bank = 8,
>   	.instance = 0,
>   };
> @@ -1335,6 +1341,7 @@ static const struct tegra_gpio_soc tegra410_system_soc = {
>   	.num_ports = ARRAY_SIZE(tegra410_system_ports),
>   	.ports = tegra410_system_ports,
>   	.name = "tegra410-gpio-system",
> +	.prefix = "SYSTEM",
>   	.num_irqs_per_bank = 8,
>   	.instance = 0,
>   };


Looks good to me.

Reviewed-by: Jon Hunter <jonathanh@...dia.com>

Jon

-- 
nvpublic