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From: Richard Zhu <hongxing.zhu@nxp.com>
To: l.stach@pengutronix.de, andrew.smirnov@gmail.com,
	shawnguo@kernel.org, kw@linux.com, bhelgaas@google.com,
	stefan@agner.ch, lorenzo.pieralisi@arm.com
Cc: linux-pci@vger.kernel.org, linux-imx@nxp.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, kernel@pengutronix.de,
	Richard Zhu <hongxing.zhu@nxp.com>
Subject: [PATCH 1/3] dt-bindings: imx6q-pcie: specify the imx8mq pcie phy voltage
Date: Fri, 19 Mar 2021 16:24:05 +0800	[thread overview]
Message-ID: <1616142247-13789-1-git-send-email-hongxing.zhu@nxp.com> (raw)

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


             reply	other threads:[~2021-03-19  8:38 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-19  8:24 Richard Zhu [this message]
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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