linux-kernel - Re: I2C OF IRQ parsing issue due to probe ordering

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Date:	Mon, 27 Oct 2014 13:58:19 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Thierry Reding <thierry.reding@...il.com>
Cc:	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org
Subject: Re: I2C OF IRQ parsing issue due to probe ordering


> The i2c@...20000 node is probed before the gpio@...51000 node. The
> of_i2c_register_devices() function tries to register all children, including
> hdmi@39. It tries to parse and map the I2C client IRQ by calling
> irq_of_parse_and_map(), which returns 0 as the interrupt controller isn't
> probed yet. The adv7511 driver later probes the hdmi@39 device and gets
> client->irq set to 0.

I've got this strange feeling of deja vu... Ah, here: Thierry Reding
tackled this problem a year ago. His series:

https://lkml.org/lkml/2013/9/16/111 (of/irq: Defer interrupt reference
resolution)

He did a V2 (which never made it to the i2c list). Seems like the first
two patches made it and the rest got stalled without discussion?

https://lkml.org/lkml/2013/9/18/216

Adding Thierry to the queue. Maybe he can bring some light to what
happened to his series.

Regards,

   Wolfram


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