linux-kernel - Re: [PATCH] i2c: core: Fix probing of i2c slaves without interrupts

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Date:	Mon, 17 Nov 2014 15:08:25 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	Geert Uytterhoeven <geert+renesas@...der.be>
Cc:	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	linux-i2c <linux-i2c@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH] i2c: core: Fix probing of i2c slaves without interrupts

On Mon, Nov 17, 2014 at 9:43 AM, Geert Uytterhoeven
<geert+renesas@...der.be> wrote:
> Since commit 2fd36c55264926e2 ("i2c: core: Map OF IRQ at probe time"),
> i2c slaves without interrupts (e.g. da9210 and at24 on r8a7791/koelsch)
> fail to probe:
>
>     at24: probe of 2-0050 failed with error -22
>
>     da9210: probe of 6-0068 failed with error -22
>
> This happens because the call to of_irq_get() in i2c_device_probe()
> returns -EINVAL.
>
> If a device node does not have an "interrupts" property,
> of_irq_parse_one() fails. Unlike irq_of_parse_and_map(), of_irq_get()
> does not ignore errors from of_irq_parse_one(), but forwards them.
>
> Make i2c_device_probe() ignore all errors but -EPROBE_DEFER to fix this,
> just like platform_get_irq() and platform_get_irq_byname() already do.
>
> Fixes: 2fd36c55264926e2 ("i2c: core: Map OF IRQ at probe time")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

With this patch applied my codec and PMIC can be probed again:

Tested-by: Fabio Estevam <fabio.estevam@...escale.com>

Thanks
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