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From: Richard Zhu <>
	Richard Zhu <>
Subject: [PATCH v3 1/3] dt-bindings: imx6q-pcie: add one regulator used to power up pcie phy
Date: Thu, 25 Mar 2021 16:44:40 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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 <>
 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
+- 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:

  reply	other threads:[~2021-03-25  8:59 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-25  8:44 [PATCH v3 0/3] " Richard Zhu
2021-03-25  8:44 ` Richard Zhu [this message]
2021-03-26  9:37   ` [PATCH v3 1/3] dt-bindings: imx6q-pcie: " Lucas Stach
2021-03-25  8:44 ` [PATCH v3 2/3] arm64: dts: imx8mq-evk: " Richard Zhu
2021-03-26  9:40   ` Lucas Stach
2021-03-25  8:44 ` [PATCH v3 3/3] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3 Richard Zhu
2021-03-26  7:45   ` Krzysztof Wilczyński
2021-03-26  9:41   ` Lucas Stach

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