linux-kernel - Re: [PATCH 13/15] i2c: core: Allow drivers to specify index for irq to get from of / ACPI

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Message-ID: <1489772461.19767.81.camel@linux.intel.com>
Date:   Fri, 17 Mar 2017 19:41:01 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, Wolfram Sang <wsa@...-dreams.de>,
        Lee Jones <lee.jones@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>
Cc:     linux-acpi@...r.kernel.org, Takashi Iwai <tiwai@...e.de>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org
Subject: Re: [PATCH 13/15] i2c: core: Allow drivers to specify index for irq
 to get from of / ACPI

On Fri, 2017-03-17 at 10:55 +0100, Hans de Goede wrote:
> Some of or ACPI declared / enumerated devices may have multiple irq
> resources declared and the driver may want to use a different irq then
> the one with index 0.
> 
> This commit adds a new irq_index field to struct i2c_driver and makes
> the i2c-core pass this to of_irq_get / acpi_dev_gpio_irq_get.
> 
> This is esp. useful for ACPI declared devices where the irq with
> index 0 may be entirely useless and cause i2c_device_probe to fail
> with
> -EPROBE_DEFER.

> --- a/include/linux/i2c.h
> +++ b/include/linux/i2c.h
> @@ -212,6 +212,9 @@ struct i2c_driver {
>  	int (*detect)(struct i2c_client *, struct i2c_board_info *);
>  	const unsigned short *address_list;
>  	struct list_head clients;
> +
> +	/* IRQ index for retreiving irq from ACPI resources */

We have kernel doc.

> +	int irq_index;

Not sure about name (would like it to be shorter, but Friday evening
doesn't allow to be creative).

>  };
>  #define to_i2c_driver(d) container_of(d, struct i2c_driver, driver)

-- 
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Intel Finland Oy