linux-kernel - Re: [PATCH 1/5] net: rfkill: gpio: convert to descriptor-based GPIO interface

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Message-ID: <528E3D5E.20907@nvidia.com>
Date:	Thu, 21 Nov 2013 12:05:34 -0500
From:	Rhyland Klein <rklein@...dia.com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
CC:	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Linus Walleij <linus.walleij@...aro.org>,
	Chris Ball <cjb@...top.org>,
	Johannes Berg <johannes@...solutions.net>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Alex Courbot <acourbot@...dia.com>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>,
	Rob Landley <rob@...dley.net>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] net: rfkill: gpio: convert to descriptor-based GPIO
 interface

On 11/21/2013 10:24 AM, Heikki Krogerus wrote:
> Hi Rhyland,
> 
> On Thu, Nov 21, 2013 at 04:45:49PM +0200, Mika Westerberg wrote:
>> +static int rfkill_gpio_convert_to_desc(struct platform_device *pdev,
>> +				       struct rfkill_gpio_data *rfkill)
>> +{
>> +	struct rfkill_gpio_platform_data *pdata = pdev->dev.platform_data;
>> +	int ret = 0;
>> +
>> +	if (gpio_is_valid(pdata->reset_gpio)) {
>> +		ret = devm_gpio_request_one(&pdev->dev, pdata->reset_gpio,
>> +					    0, rfkill->reset_name);
>> +		if (ret) {
>> +			pr_warn("%s: failed to get reset gpio.\n", __func__);
>> +			return ret;
>> +		}
>> +		rfkill->reset_gpio = gpio_to_desc(pdata->reset_gpio);
>> +	}
>> +
>> +	if (gpio_is_valid(pdata->shutdown_gpio)) {
>> +		ret = devm_gpio_request_one(&pdev->dev, pdata->shutdown_gpio,
>> +					    0, rfkill->shutdown_name);
>> +		if (ret) {
>> +			pr_warn("%s: failed to get shutdown gpio.\n", __func__);
>> +			return ret;
>> +		}
>> +		rfkill->shutdown_gpio = gpio_to_desc(pdata->shutdown_gpio);
>> +	}
>> +
>> +	return 0;
>> +}
> 
> We could drop this conversion if you guys added gpiod_lookup table to
> your platform code. I think something like this is enough. Please note
> that I have not even tried compile it but you get the idea from it.
> 
> diff --git a/arch/arm/mach-tegra/board-paz00.c b/arch/arm/mach-tegra/board-paz00.c
> index 06f0240..19bce88 100644
> --- a/arch/arm/mach-tegra/board-paz00.c
> +++ b/arch/arm/mach-tegra/board-paz00.c
> @@ -18,13 +18,12 @@
>   */
>  
>  #include <linux/platform_device.h>
> +#include <linux/gpio/driver.h>
>  #include <linux/rfkill-gpio.h>
>  #include "board.h"
>  
>  static struct rfkill_gpio_platform_data wifi_rfkill_platform_data = {
>         .name           = "wifi_rfkill",
> -       .reset_gpio     = 25, /* PD1 */
> -       .shutdown_gpio  = 85, /* PK5 */
>         .type   = RFKILL_TYPE_WLAN,
>  };
>  
> @@ -36,7 +35,13 @@ static struct platform_device wifi_rfkill_device = {
>         },
>  };
>  
> +static struct gpiod_lookup wifi_gpio_lookup[] = {
> +       GPIO_LOOKUP_IDX("tegra-gpio", 25, "rfkill_gpio", NULL, 0, NULL),
> +       GPIO_LOOKUP_IDX("tegra-gpio", 85, "rfkill_gpio", NULL, 1, NULL),
> +};
> +
>  void __init tegra_paz00_wifikill_init(void)
>  {
> +       gpiod_add_table(wifi_lookup, ARRAY_SIZE(wifi_gpio_lookup));
>         platform_device_register(&wifi_rfkill_device);
>  }
> 
> 

This seems like a reasonable patch, and likely a good way to go. I don't
have a AC100 to test this with though, so I can't verify this
personally. Also, would the paz00 patch become a dependency of this
patchset? Mika, maybe you can therefore include a patch for paz00 in
your patchset?

-rhyland

-- 
nvpublic
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