diff options
| author | Richard Zhu <hongxing.zhu@nxp.com> | 2018-03-13 17:14:07 +0800 |
|---|---|---|
| committer | Jason Liu <jason.hui.liu@nxp.com> | 2018-10-29 11:10:38 +0800 |
| commit | ed8f3d102b5f18190438444e47e0fdfceac420e7 (patch) | |
| tree | cb94923eb4146b4e6a0135fad21c68288ee929d6 /Documentation | |
| parent | 00d85eadb2a2f4f350b3bd54cddbdd3263829fec (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: |