linux-kernel - Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any request

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Date:   Wed, 7 Jun 2023 12:46:42 +0100
From:   Jon Hunter <jonathanh@...dia.com>
To:     Prathamesh Shete <pshete@...dia.com>, linus.walleij@...aro.org,
        brgl@...ev.pl, thierry.reding@...il.com,
        linux-tegra@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     smangipudi@...dia.com, Manish Bhardwaj <mbhardwaj@...dia.com>
Subject: Re: [PATCH v2] gpio: tegra186: Check PMC driver status before any
 request


On 07/06/2023 12:31, Prathamesh Shete wrote:
> When the PMC device is disabled, probing of the Tegra186 GPIO driver
> fails because the IRQ domain that is registered by the PMC driver is
> not found. The PMC IRQ domain is only used for wake-up and does not
> impact GPIO functionality in general. Therefore, if the PMC device is
> disabled, skip looking up the PMC IRQ domain to allow the GPIO driver
> to be probed.
> 
> Signed-off-by: Manish Bhardwaj <mbhardwaj@...dia.com>
> Signed-off-by: Prathamesh Shete <pshete@...dia.com>
> ---
>   drivers/gpio/gpio-tegra186.c | 14 +++++++++-----
>   1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/gpio-tegra186.c b/drivers/gpio/gpio-tegra186.c
> index 464b0ea3b6f1..80d08ddde40e 100644
> --- a/drivers/gpio/gpio-tegra186.c
> +++ b/drivers/gpio/gpio-tegra186.c
> @@ -964,11 +964,15 @@ static int tegra186_gpio_probe(struct platform_device *pdev)
>   
>   	np = of_find_matching_node(NULL, tegra186_pmc_of_match);
>   	if (np) {
> -		irq->parent_domain = irq_find_host(np);
> -		of_node_put(np);
> -
> -		if (!irq->parent_domain)
> -			return -EPROBE_DEFER;
> +		if (of_device_is_available(np)) {
> +			irq->parent_domain = irq_find_host(np);
> +			of_node_put(np);
> +
> +			if (!irq->parent_domain)
> +				return -EPROBE_DEFER;
> +		} else {
> +			of_node_put(np);
> +		}
>   	}
>   
>   	irq->map = devm_kcalloc(&pdev->dev, gpio->gpio.ngpio,

Thanks!

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

Jon

-- 
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