diff options
| author | Madalin Bucur <madalin.bucur@oss.nxp.com> | 2020-01-22 15:20:27 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-01-23 21:17:13 +0100 |
| commit | 2934d2c67838ba442fbd0b0560ba641044a5ceba (patch) | |
| tree | 7be476f8755f711b1cd16cb9a3585e69b1d23d08 /Documentation | |
| parent | 22e984493a41bf8081f13d9ed84def3ca8cfd427 (diff) | |
| download | linux-2934d2c67838ba442fbd0b0560ba641044a5ceba.tar.bz2 | |
dt-bindings: net: add fsl,erratum-a011043
Add an entry for erratum A011043: the MDIO_CFG[MDIO_RD_ER]
bit may be falsely set when reading internal PCS registers.
MDIO reads to internal PCS registers may result in having
the MDIO_CFG[MDIO_RD_ER] bit set, even when there is no
error and read data (MDIO_DATA[MDIO_DATA]) is correct.
Software may get false read error when reading internal
PCS registers through MDIO. As a workaround, all internal
MDIO accesses should ignore the MDIO_CFG[MDIO_RD_ER] bit.
Signed-off-by: Madalin Bucur <madalin.bucur@oss.nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/net/fsl-fman.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/net/fsl-fman.txt b/Documentation/devicetree/bindings/net/fsl-fman.txt index 299c0dcd67db..250f8d8cdce4 100644 --- a/Documentation/devicetree/bindings/net/fsl-fman.txt +++ b/Documentation/devicetree/bindings/net/fsl-fman.txt @@ -403,6 +403,19 @@ PROPERTIES The settings and programming routines for internal/external MDIO are different. Must be included for internal MDIO. +- fsl,erratum-a011043 + Usage: optional + Value type: <boolean> + Definition: Indicates the presence of the A011043 erratum + describing that the MDIO_CFG[MDIO_RD_ER] bit may be falsely + set when reading internal PCS registers. MDIO reads to + internal PCS registers may result in having the + MDIO_CFG[MDIO_RD_ER] bit set, even when there is no error and + read data (MDIO_DATA[MDIO_DATA]) is correct. + Software may get false read error when reading internal + PCS registers through MDIO. As a workaround, all internal + MDIO accesses should ignore the MDIO_CFG[MDIO_RD_ER] bit. + For internal PHY device on internal mdio bus, a PHY node should be created. See the definition of the PHY node in booting-without-of.txt for an example of how to define a PHY (Internal PHY has no interrupt line). |