diff options
| author | Richard Zhu <hongxing.zhu@nxp.com> | 2018-03-13 17:14:07 +0800 |
|---|---|---|
| committer | Leonard Crestez <leonard.crestez@nxp.com> | 2018-08-24 12:41:33 +0300 |
| commit | d2b62091032cb4dd194139ea6592e95ea09cf2a4 (patch) | |
| tree | 5d45c7181eb86d612e85e26dbfa0e9574b60b020 /Documentation | |
| parent | ab1538a7cdad3eb1f5fbd29077059958ab4b43ef (diff) | |
MLK-17815-2 ata: imx: imx8qm: configure phy impedance ratio
- To save power consumption, PHY related CLKs can be
gated off after the configurations are done.
- The impedance ratio should be configured refer to
differnet REXT values.
0x6c <--> REXT valuse is 85Ohms
Default values 0x80 <--> REXT value is 100Ohms.
- IMX8QM_HSIO_PHY_X1_APB_CLK is mandatory required when
access SATA PHY registers. Change the power domain to SATA.
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/ata/imx-sata.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/ata/imx-sata.txt b/Documentation/devicetree/bindings/ata/imx-sata.txt index fa511db18408..49c4135dd9f2 100644 --- a/Documentation/devicetree/bindings/ata/imx-sata.txt +++ b/Documentation/devicetree/bindings/ata/imx-sata.txt @@ -7,6 +7,7 @@ Required properties: - compatible : should be one of the following: - "fsl,imx53-ahci" for i.MX53 SATA controller - "fsl,imx6q-ahci" for i.MX6Q SATA controller + - "fsl,imx8qm-ahci" for i.MX8QM SATA controller - interrupts : interrupt mapping for SATA IRQ - reg : registers mapping - clocks : list of clock specifiers, must contain an entry for each @@ -22,6 +23,9 @@ Optional properties: for the list of legal values for these options. - fsl,no-spread-spectrum : disable spread-spectrum clocking on the SATA link. +- fsl,phy-imp: PHY impedance ratio value refer to the differnt HW design. + Set it to 0x6c when 85OHM is used, keep it to default value 0x80 when + 100OHM is used. Examples: |