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[v2,12/12] i2c: designware: Add comment to custom register value constants

Message ID 20221102131125.421512-13-jarkko.nikula@linux.intel.com
State Superseded
Headers show
Series i2c: designware: Slave fixes and generic cleanups | expand

Commit Message

Jarkko Nikula Nov. 2, 2022, 1:11 p.m. UTC
DW_IC_COMP_VERSION register contains the ASCII representation of the
Synopsys component version followed by '*'. Here 0x3131312A == "111*"
means version 1.11 is required for DW_IC_SDA_HOLD register availability.

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>
---
 drivers/i2c/busses/i2c-designware-core.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/i2c/busses/i2c-designware-core.h b/drivers/i2c/busses/i2c-designware-core.h
index 0668888d557d..aae22ca5c5e2 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*" == 1.11 */
 #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)