soundwire: Add bra_block_alignment property support

Add a property to struct sdw_slave_prop equivalent to the Disco
property "mipi-sdw-bra-mode-block-alignment".

The SoundWire Disco specification defines this as:

"The data payload size for this BRA Mode shall be an integer
multiple of the value of this Property."

Change-Id: I27ab84b0ed0f236a5eae58600400a4c386132480
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Co-developed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: rfvirgil

drivers/soundwire/mipi_disco.c

@@ -471,6 +471,9 @@ int sdw_slave_read_prop(struct sdw_slave *slave)
 	device_property_read_u32(dev, "mipi-sdw-sdca-interrupt-register-list",
 				 &prop->sdca_interrupt_register_list);
 
+	device_property_read_u32(dev, "mipi-sdw-bra-mode-block-alignment",
+				 &prop->bra_block_alignment);
+
 	prop->commit_register_supported = mipi_device_property_read_bool(dev,
 			"mipi-sdw-commit-register-supported");
 

include/linux/soundwire/sdw.h

@@ -364,6 +364,8 @@ struct sdw_dpn_prop {
  * @commit_register_supported: is PCP_Commit register supported
  * @scp_int1_mask: SCP_INT1_MASK desired settings
  * @lane_maps: Lane mapping for the slave, only valid if lane_control_support is set
+ * @bra_block_alignment: If non-zero the length of data in a BRA frame must be
+ *			 a multiple of this number of bytes.
  * @clock_reg_supported: the Peripheral implements the clock base and scale
  * registers introduced with the SoundWire 1.2 specification. SDCA devices
  * do not need to set this boolean property as the registers are required.
@@ -394,6 +396,7 @@ struct sdw_slave_prop {
 	u8 commit_register_supported;
 	u8 scp_int1_mask;
 	u8 lane_maps[SDW_MAX_LANES];
+	u32 bra_block_alignment;
 	bool clock_reg_supported;
 	bool use_domain_irq;
 };