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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>
This commit is contained in:
Jarkko Nikula 2022-11-07 15:42:48 +02:00 committed by Wolfram Sang
parent 966b7d3c73
commit 4bae6da1cb
1 changed files with 2 additions and 2 deletions
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4
drivers/i2c/busses/i2c-designware-core.h
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@ -79,9 +79,9 @@
#define DW_IC_CLR_RESTART_DET 0xa8
#define DW_IC_COMP_PARAM_1 0xf4
#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_VALUE 0x44570140
#define DW_IC_COMP_TYPE_VALUE 0x44570140 /* "DW" + 0x0140 */
#define DW_IC_INTR_RX_UNDER BIT(0)
#define DW_IC_INTR_RX_OVER BIT(1)