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* [PATCH 1/3] dt-bindings: imx6q-pcie: specify the imx8mq pcie phy voltage
@ 2021-03-19  8:24 Richard Zhu
  2021-03-19  8:24 ` [PATCH 2/3] arm64: dts: add one property to " Richard Zhu
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Richard Zhu @ 2021-03-19  8:24 UTC (permalink / raw)
  To: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
	lorenzo.pieralisi
  Cc: linux-pci, linux-imx, linux-arm-kernel, linux-kernel, kernel,
	Richard Zhu

Both 1.8v and 3.3v power supplies can be feeded to 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.

Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
---
 Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index de4b2baf91e8..23efbad9e804 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -59,6 +59,10 @@ Additional required properties for imx7d-pcie and imx8mq-pcie:
 Additional required properties for imx8mq-pcie:
 - clock-names: Must include the following additional entries:
 	- "pcie_aux"
+- pcie-vph-3v3: If present then PCIE_VPH is feeded by 3.3v in the HW
+  schematic design. The PCIE_VPH is suggested to be 1.8v refer to the
+  data sheet. If the PCIE_VPH is supplied by 3.3V, the VREG_BYPASS
+  should be cleared to zero accordingly.
 
 Example:
 
-- 
2.17.1


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-03-19  9:50 UTC | newest]

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2021-03-19  8:24 [PATCH 1/3] dt-bindings: imx6q-pcie: specify the imx8mq pcie phy voltage Richard Zhu
2021-03-19  8:24 ` [PATCH 2/3] arm64: dts: add one property to " Richard Zhu
2021-03-19  8:24 ` [PATCH 3/3] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3 Richard Zhu
2021-03-19  9:49 ` [PATCH 1/3] dt-bindings: imx6q-pcie: specify the imx8mq pcie phy voltage Lucas Stach

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