linux-kernel - Re: [PATCH 17/23] gpio: nomadik: handle variadic GPIO count

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Date: Mon, 19 Feb 2024 17:17:52 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, Thomas Bogendoerfer <tsbogend@...ha.franken.de>, 
	linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mips@...r.kernel.org, Gregory CLEMENT <gregory.clement@...tlin.com>, 
	Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>, Tawfik Bayouk <tawfik.bayouk@...ileye.com>
Subject: Re: [PATCH 17/23] gpio: nomadik: handle variadic GPIO count

On Wed, Feb 14, 2024 at 5:24 PM Théo Lebrun <theo.lebrun@...tlin.com> wrote:
>
> Read the "ngpios" device-tree property to determine the number of GPIOs
> for a bank. If not available, fallback to NMK_GPIO_PER_CHIP ie 32 ie
> the current behavior.
>
> The IP block always supports 32 GPIOs, but platforms can expose a lesser
> amount. The Mobileye EyeQ5 is in this case; one bank is 29 GPIOs and
> the other is 23.
>
> Signed-off-by: Théo Lebrun <theo.lebrun@...tlin.com>
> ---
>  drivers/gpio/gpio-nomadik.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
> index 5b1e3b3efcff..02b53c58adf7 100644
> --- a/drivers/gpio/gpio-nomadik.c
> +++ b/drivers/gpio/gpio-nomadik.c
> @@ -490,7 +490,7 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np,
>         struct resource *res;
>         struct clk *clk;
>         void __iomem *base;
> -       u32 id;
> +       u32 id, ngpio;
>
>         gpio_pdev = of_find_device_by_node(np);
>         if (!gpio_pdev) {
> @@ -518,10 +518,15 @@ struct nmk_gpio_chip *nmk_gpio_populate_chip(struct device_node *np,
>                 return ERR_PTR(-ENOMEM);
>         }
>
> +       if (of_property_read_u32(np, "ngpios", &ngpio)) {

As commented elsewhere - please try to use device_property_read_u32().

Bart

> +               ngpio = NMK_GPIO_PER_CHIP;
> +               dev_dbg(&pdev->dev, "populate: using default ngpio (%d)\n", ngpio);
> +       }
> +
>         nmk_chip->bank = id;
>         chip = &nmk_chip->chip;
>         chip->base = -1;
> -       chip->ngpio = NMK_GPIO_PER_CHIP;
> +       chip->ngpio = ngpio;
>         chip->label = dev_name(&gpio_pdev->dev);
>         chip->parent = &gpio_pdev->dev;
>
>
> --
> 2.43.1
>