linux-kernel - Re: [RFC/PATCH v2] MIPS: pci: lantiq: switch to using gpiod API

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Message-ID: <20220930151525.GC12989@alpha.franken.de>
Date:   Fri, 30 Sep 2022 17:15:25 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC/PATCH v2] MIPS: pci: lantiq: switch to using gpiod API

On Mon, Sep 26, 2022 at 09:59:00PM -0700, Dmitry Torokhov wrote:
> This patch switches the driver from legacy gpio API to the newer
> gpiod API.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> ---
> v2 - actually compiles.

I have some doubts...

>  arch/mips/pci/pci-lantiq.c | 27 ++++++++++++---------------
>  1 file changed, 12 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/mips/pci/pci-lantiq.c b/arch/mips/pci/pci-lantiq.c
> index 1ca42f482130..377b4a2577e1 100644
> --- a/arch/mips/pci/pci-lantiq.c
> +++ b/arch/mips/pci/pci-lantiq.c
> @@ -9,11 +9,11 @@
>  #include <linux/kernel.h>
>  #include <linux/init.h>
>  #include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
>  #include <linux/mm.h>
>  #include <linux/vmalloc.h>
>  #include <linux/clk.h>
>  #include <linux/of_platform.h>
> -#include <linux/of_gpio.h>
>  #include <linux/of_irq.h>
>  #include <linux/of_pci.h>
>  
> @@ -62,7 +62,7 @@
>  __iomem void *ltq_pci_mapped_cfg;
>  static __iomem void *ltq_pci_membase;
>  
> -static int reset_gpio;
> +static gpio_desc *reset_gpio;

/local/tbogendoerfer/korg/linux/arch/mips/pci/pci-lantiq.c:65:8: error: unknown type name ‘gpio_desc’
 static gpio_desc *reset_gpio;


>  static struct clk *clk_pci, *clk_external;
>  static struct resource pci_io_resource;
>  static struct resource pci_mem_resource;
> @@ -123,17 +123,14 @@ static int ltq_pci_startup(struct platform_device *pdev)
>  		clk_disable(clk_external);
>  
>  	/* setup reset gpio used by pci */
> -	reset_gpio = of_get_named_gpio(node, "gpio-reset", 0);
> -	if (gpio_is_valid(reset_gpio)) {
> -		int ret = devm_gpio_request(&pdev->dev,
> -						reset_gpio, "pci-reset");
> -		if (ret) {
> -			dev_err(&pdev->dev,
> -				"failed to request gpio %d\n", reset_gpio);
> -			return ret;
> -		}
> -		gpio_direction_output(reset_gpio, 1);
> +	reset_gpio = devm_gpiod_get_optional(&pdev->dev, "reset",
> +					     GPIOD_OUT_LOW);
> +	ret = PTR_ERR_OR_ZERO(reset_gpio);

/local/tbogendoerfer/korg/linux/arch/mips/pci/pci-lantiq.c:128:2: error: ‘ret’ undeclared (first use in this function)
  ret = PTR_ERR_OR_ZERO(reset_gpio);

Thomas.


-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]