Messages in this thread | | | Date | Tue, 17 Jun 2014 13:29:32 -0700 | From | Guenter Roeck <> | Subject | Re: Problems with commit 9ec36cafe4 (of/irq: do irq resolution in platform_get_irq) and mfd client devices |
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On Tue, Jun 17, 2014 at 03:08:24PM -0500, Rob Herring wrote: > On Tue, Jun 17, 2014 at 1:10 PM, Guenter Roeck <linux@roeck-us.net> wrote: > > Hi, > > > > I have an mfd master and client drivers on a system which has devicetree > > enabled. The mfd master driver passes interrupts to the clients using > > mfd cells and 'struct resource'. The client driver is a platform driver > > which retrieves the irq using platform_get_irq(). > > > > After commit 9ec36cafe (of/irq: do irq resolution in platform_get_irq), > > this code no longer works. This is because platform_get_irq() does no > > longer call platform_get_resource() if OF is enabled and if dev->of_node > > is not NULL (it is not NULL because there is other [static] information > > which is passed to the client with devicetree data). > > > > Any idea how to solve this problem ? How do I now pass a virtual interrupt > > from an mfd master to its clients if devicetree is enabled ? > > The node ptr points to the MFD node or a child node? If there are > child nodes in DT, then why not define interrupts there too? If there > are not child nodes, then perhaps the child drivers should not have DT > knowledge. > There is a whole bunch of secondary data in the child's dt node. One of the child/client drivers is an i2c controller with attached i2c muxes and several i2c devices, another is a gpio controller with a large number of gpio pins which itself acts as interrupt controller.
> Does it fail to get an interrupt or gets the parent interrupt instead? > It fails to get an interrupt and returns -EINVAL.
> We could probably make an error fall-back to looking at resources. Or > try to get irq from resources first, then call of_irq_get. > I submitted a patch implementing the first approach a few minutes ago. That fixes the problem for me. Not sure if that is the right solution though, as it doesn't handle -EPROBE_DEFER. Let me know when you see the patch if there is a better way to handle it (maybe abort with -EPROBE_DEFER if of_irq_get returns it would do).
Guenter
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