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| author | Jarkko Nikula <jarkko.nikula@linux.intel.com> | 2022-11-07 15:42:48 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2022-11-12 07:38:16 +0100 |
| commit | 4bae6da1cbf4658a92e6f58da30bf536746d1e5d (patch) | |
| tree | 49c45188b45b29793bc263f966f5dc890ab381d5 /drivers/i2c | |
| parent | 966b7d3c738ab8d82363eff9e4c62e429697893e (diff) | |
| download | linux-4bae6da1cbf4658a92e6f58da30bf536746d1e5d.tar.bz2 | |
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-core.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h index 0668888d557d..95ebc5eaa5d1 100644 --- a/drivers/i2c/busses/i2c-designware-core.h +++ b/drivers/i2c/busses/i2c-designware-core.h @@ -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) |