linux-kernel - Re: [PATCH 4/5] i2c: core: Move ACPI gpio IRQ handling into i2c_acpi_get

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Message-ID: <20190521172726.GO9224@smile.fi.intel.com>
Date:   Tue, 21 May 2019 20:27:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Charles Keepax <ckeepax@...nsource.cirrus.com>
Cc:     wsa@...-dreams.de, mika.westerberg@...ux.intel.com,
        jarkko.nikula@...ux.intel.com, linux-i2c@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        benjamin.tissoires@...hat.com, jbroadus@...il.com,
        patches@...nsource.cirrus.com
Subject: Re: [PATCH 4/5] i2c: core: Move ACPI gpio IRQ handling into
 i2c_acpi_get_irq

On Tue, May 21, 2019 at 04:05:01PM +0100, Charles Keepax wrote:
> It makes sense to contain all the ACPI IRQ handling in a single helper
> function.

> Note that this one is somewhat interesting, it seems the search
> through the resource list is done against the companion device
> of the adapter but the GPIO search is done against the companion
> device of the client. It feels to me like these really should
> be done on the same device, and certainly this is what SPI
> does (both against the equivalent of the adapter). Perhaps
> someone with more ACPI knowledge than myself could comment?

It would be interesting to see the path how you come to this conclusion.

>  	acpi_dev_free_resource_list(&resource_list);
>  
> +	if (*irq < 0)
> +		*irq = acpi_dev_gpio_irq_get(ACPI_COMPANION(&client->dev), 0);

I think adev here is what we may use here.

You may put assert here and see if it happens when you test your series.

-- 
With Best Regards,
Andy Shevchenko