On Mon, Oct 27, 2014 at 01:58:19PM +0100, Wolfram Sang wrote: > > > The i2c@e6520000 node is probed before the gpio@e6051000 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. I tried to fix it in a proper way, but it seems people were uneasy with how invasive the change was. At some point I lost interest. People ended up merging something that was similar, but side-stepped the issue of propagating error codes all the way up by introducing a new API and in case of of_irq_parse_one() failing doing an additional check to see if the reason was the missing IRQ domain. See: 9ec36cafe43b of/irq: do irq resolution in platform_get_irq I suspect a similar thing could be done for I2C. Thierry
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