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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 2/3] arm64: dts: add one property to specify the imx8mq pcie phy voltage
Date: Fri, 19 Mar 2021 16:24:06 +0800	[thread overview]
Message-ID: <1616142247-13789-2-git-send-email-hongxing.zhu@nxp.com> (raw)
In-Reply-To: <1616142247-13789-1-git-send-email-hongxing.zhu@nxp.com>

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>
---
 arch/arm64/boot/dts/freescale/imx8mq-evk.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
index 85b045253a0e..30bcf5f583e0 100644
--- a/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mq-evk.dts
@@ -318,6 +318,7 @@
 		 <&clk IMX8MQ_CLK_PCIE1_PHY>,
 		 <&pcie0_refclk>;
 	clock-names = "pcie", "pcie_aux", "pcie_phy", "pcie_bus";
+	pcie-vph-3v3;
 	status = "okay";
 };
 
-- 
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 [PATCH 1/3] dt-bindings: imx6q-pcie: " Richard Zhu
2021-03-19  8:24 ` Richard Zhu [this message]
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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