[PATCH v3 1/3] dt-bindings: imx6q-pcie: add one regulator used to power up pcie phy

From: Richard Zhu
Date: Thu Mar 25 2021 - 04:59:36 EST


Both 1.8v and 3.3v power supplies can be used by i.MX8MQ PCIe PHY.
In default, the PCIE_VPH voltage is suggested to be 1.8v refer to data
sheet. When PCIE_VPH is supplied by 3.3v in the HW schematic design,
the VREG_BYPASS bits of GPR registers should be cleared from default
value 1b'1 to 1b'0. Thus, the internal 3v3 to 1v8 translator would be
turned on.

Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
---
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 3 +++
1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index de4b2baf91e8..e6d1886144ce 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -38,6 +38,9 @@ Optional properties:
The regulator will be enabled when initializing the PCIe host and
disabled either as part of the init process or when shutting down the
host.
+- vph-supply: Should specify the regulator in charge of VPH one of the three
+ PCIe PHY powers. This regulator can be supplied by both 1.8v and 3.3v voltage
+ supplies. Might be used to distinguish different HW board designs.

Additional required properties for imx6sx-pcie:
- clock names: Must include the following additional entries:
--
2.17.1