From 56d4fe31af77f684bed62fb8201e6327e6ddf4e6 Mon Sep 17 00:00:00 2001
From: Vinod Koul <vinod.koul@intel.com>
Date: Thu, 14 Dec 2017 11:19:35 +0530
Subject: soundwire: Add MIPI DisCo property helpers
MIPI Discovery And Configuration (DisCo) Specification for SoundWire
specifies properties to be implemented for SoundWire Masters and
Slaves. The DisCo spec doesn't mandate these properties. However,
SDW bus cannot work without knowing these values.
The helper functions read the Master and Slave properties.
Implementers of Master or Slave drivers can use any of the below
three mechanisms:
a) Use these APIs here as .read_prop() callback for Master
and Slave
b) Implement own methods and set those as .read_prop(), but invoke
APIs in this file for generic read and override the values with
platform specific data
c) Implement ones own methods which do not use anything provided
here
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/soundwire/bus.c | 8 ++++++++
1 file changed, 8 insertions(+)
(limited to 'drivers/soundwire/bus.c')
diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index bc72c3d58bbf..9626bd1ab271 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -25,6 +25,14 @@ int sdw_add_bus_master(struct sdw_bus *bus)
mutex_init(&bus->bus_lock);
INIT_LIST_HEAD(&bus->slaves);
+ if (bus->ops->read_prop) {
+ ret = bus->ops->read_prop(bus);
+ if (ret < 0) {
+ dev_err(bus->dev, "Bus read properties failed:%d", ret);
+ return ret;
+ }
+ }
+
/*
* Device numbers in SoundWire are 0 thru 15. Enumeration device
* number (0), Broadcast device number (15), Group numbers (12 and
--
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