Re: [PATCH v4 12/15] soundwire: cdns: Add sdw_master_ops and IO transfer support

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  struct sdw_cdns {
  	struct device *dev;
  	struct sdw_bus bus;
  	unsigned int instance;
+ u32 response_buf[0x80];

last nit-pick: use a #define for the size.
Also are you sure about the value? I vaguely recall that the FIFO was 32-deep, you are confusing bytes and words here?

+	struct completion tx_complete;
+	struct sdw_defer *defer;
+
  	void __iomem *registers;
bool link_up;
+	unsigned int msg_count;
  };
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