mdio: Add 10GBASE-T SNR register definition

These do not have an in-kernel user but may be useful to user-space.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/mdio.h b/include/linux/mdio.h
index 26b4eb3bbee9..825f1e2e2ec3 100644
--- a/include/linux/mdio.h
+++ b/include/linux/mdio.h
@@ -46,6 +46,8 @@
 
 /* Media-dependent registers. */
 #define MDIO_PMA_10GBT_TXPWR    131     /* 10GBASE-T TX power control */
+#define MDIO_PMA_10GBT_SNR      133     /* 10GBASE-T SNR margin, lane A.
+                                         * Lanes B-D are numbered 134-136. */
 #define MDIO_PMA_10GBR_FECABLE  170     /* 10GBASE-R FEC ability */
 #define MDIO_PCS_10GBX_STAT1    24      /* 10GBASE-X PCS status 1 */
 #define MDIO_PCS_10GBRT_STAT1   32      /* 10GBASE-R/-T PCS status 1 */
@@ -188,6 +190,11 @@
 /* PMA 10GBASE-T TX power register. */
 #define MDIO_PMA_10GBT_TXPWR_SHORT      0x0001  /* Short-reach mode */
 
+/* PMA 10GBASE-T SNR registers. */
+/* Value is SNR margin in dB, clamped to range [-127, 127], plus 0x8000. */
+#define MDIO_PMA_10GBT_SNR_BIAS         0x8000
+#define MDIO_PMA_10GBT_SNR_MAX          127
+
 /* PMA 10GBASE-R FEC ability register. */
 #define MDIO_PMA_10GBR_FECABLE_ABLE     0x0001  /* FEC ability */
 #define MDIO_PMA_10GBR_FECABLE_ERRABLE  0x0002  /* FEC error indic. ability */