soundwire: get mipi-sdw-bra-mode-max-data-per-frame property

Get the mipi-sdw-bra-mode-max-data-per-frame property which indicates
the maximum data payload size (in bytes per frame excluding header,
CRC, and footer) for the BRA Mode.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>

Author: bardliao

drivers/soundwire/mipi_disco.c

@@ -474,6 +474,9 @@ int sdw_slave_read_prop(struct sdw_slave *slave)
 	device_property_read_u32(dev, "mipi-sdw-bra-mode-block-alignment",
 				 &prop->bra_block_alignment);
 
+	device_property_read_u32(dev, "mipi-sdw-bra-mode-max-data-per-frame",
+				 &prop->bra_max_data_per_frame);
+
 	prop->commit_register_supported = mipi_device_property_read_bool(dev,
 			"mipi-sdw-commit-register-supported");
 

include/linux/soundwire/sdw.h

@@ -366,6 +366,8 @@ struct sdw_dpn_prop {
  * @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.
+ * @bra_max_data_per_frame: If non-zero the maximum data payload size (in bytes per
+			    frame excluding header, CRC, and footer) for this BRA Mode
  * @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.
@@ -397,6 +399,7 @@ struct sdw_slave_prop {
 	u8 scp_int1_mask;
 	u8 lane_maps[SDW_MAX_LANES];
 	u32 bra_block_alignment;
+	u32 bra_max_data_per_frame;
 	bool clock_reg_supported;
 	bool use_domain_irq;
 };