Em Wed, 06 Feb 2013 18:18:22 +0100
Sebastian Hesselbarth [off-list ref] escreveu:

On 02/06/2013 02:48 PM, Sylwester Nawrocki wrote:

quoted

On 02/06/2013 09:03 AM, Sebastian Hesselbarth wrote:

quoted

This patch adds device tree parsing for gpio_ir_recv platform_data and
the mandatory binding documentation. It basically follows what we already
have for e.g. gpio_keys. All required device tree properties are OS
independent but optional properties allow linux specific support for rc
protocols and maps.

There was a similar patch sent by Matus Ujhelyi but that discussion
died after the first reviews.

Signed-off-by: Sebastian Hesselbarth<sebastian.hesselbarth@gmail.com>
---

...

quoted

diff --git a/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt
new file mode 100644
index 0000000..937760c
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/gpio-ir-receiver.txt

@@ -0,0 +1,20 @@
+Device-Tree bindings for GPIO IR receiver
+
+Required properties:
+	- compatible = "gpio-ir-receiver";
+	- gpios: OF device-tree gpio specification.
+
+Optional properties:
+	- linux,allowed-rc-protocols: Linux specific u64 bitmask of allowed
+	    rc protocols.

You likely need to specify in these bindings documentation which bit
corresponds to which RC protocol.

I'm not very familiar with the RC internals, but why it has to be
specified statically in the device tree, when decoding seems to be
mostly software defined ? I might be missing something though..

Sylwester,

I am not familiar with RC internals either. Maybe somebody with more
insight in media/rc can clarify the specific needs for the rc subsystem.
I was just transferring the DT support approach taken by gpio_keys to
gpio_ir_recv as I will be using it on mach-dove/cubox soon.

The allowed rc protocol field are there for devices with hardware IR
support, where only a limited set of remote protocols can be decoded.

For software decoders RC_BIT_ALL is the proper setup. Users of course
can change it via sysfs at runtime, or a software decoder may be
disabled at compilation time by not selecting its CONFIG_* var.

quoted

Couldn't this be configured at run time, with all protocols allowed
as the default ?

Actually, this is how the internal rc code works. If there is nothing
defined for allowed_protocols it assumes that all protocols are supported.
That is why above node properties are optional.

About the binding documentation of allowed_protocols, rc_map, or the
default behavior of current linux code, I don't think they will stay
in-sync for long. 

Why not? The rc_map name is used either by Kernelspace or by Userspace,
in order to provide the IR keycode name that matches a given keytable.

There's no plans to change it, even in the long term.

Regards,
Mauro.

-- 

Cheers,
Mauro