Commit 4bae6da1 authored Nov 07, 2022 by Jarkko Nikula Committed by Wolfram Sang Nov 12, 2022

i2c: designware: Add comment to custom register value constants



DW_IC_COMP_VERSION register contains the ASCII representation of the
Synopsys component version. Here 0x3131312A == "111*" means version
1.11* required for DW_IC_SDA_HOLD register availability where '*' means
any letter starting from 'a'.

DW_IC_COMP_TYPE is constant and is derived from two ASCII letters "DW"
followed by a 16-bit unsigned number.

Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

parent 966b7d3c

drivers/i2c/busses/i2c-designware-core.h

+2 −2

Original line number	Original line	Diff line number	Diff line
	@@ -79,9 +79,9 @@
	#define DW_IC_CLR_RESTART_DET 0xa8		#define DW_IC_CLR_RESTART_DET 0xa8
	#define DW_IC_COMP_PARAM_1 0xf4		#define DW_IC_COMP_PARAM_1 0xf4
	#define DW_IC_COMP_VERSION 0xf8		#define DW_IC_COMP_VERSION 0xf8
	#define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A		#define DW_IC_SDA_HOLD_MIN_VERS 0x3131312A /* "111" == v1.11 */
	#define DW_IC_COMP_TYPE 0xfc		#define DW_IC_COMP_TYPE 0xfc
	#define DW_IC_COMP_TYPE_VALUE 0x44570140		#define DW_IC_COMP_TYPE_VALUE 0x44570140 /* "DW" + 0x0140 */

	#define DW_IC_INTR_RX_UNDER BIT(0)		#define DW_IC_INTR_RX_UNDER BIT(0)
	#define DW_IC_INTR_RX_OVER BIT(1)		#define DW_IC_INTR_RX_OVER BIT(1)