linux-kernel - [PATCH v6 09/11] PCI: imx6: Add a new imx8mm_pcie_clkreq

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Message-Id: <20251015030428.2980427-10-hongxing.zhu@nxp.com>
Date: Wed, 15 Oct 2025 11:04:26 +0800
From: Richard Zhu <hongxing.zhu@....com>
To: frank.li@....com,
	l.stach@...gutronix.de,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
	mani@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	bhelgaas@...gle.com,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com
Cc: linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	Richard Zhu <hongxing.zhu@....com>
Subject: [PATCH v6 09/11] PCI: imx6: Add a new imx8mm_pcie_clkreq_override() for i.MX8M PCIes

Add a new imx8mm_pcie_clkreq_override() for i.MX8M PCIes. Pave the path
to support L1 PM Substates after clear CLKREQ# override. No function
changes.

Signed-off-by: Richard Zhu <hongxing.zhu@....com>
---
 drivers/pci/controller/dwc/pci-imx6.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4668fc9648bff..a60fe7c337e08 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -685,7 +685,7 @@ static int imx6q_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 	return 0;
 }
 
-static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+static void imx8mm_pcie_clkreq_override(struct imx_pcie *imx_pcie, bool enable)
 {
 	int offset = imx_pcie_grp_offset(imx_pcie);
 
@@ -695,6 +695,11 @@ static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 	regmap_update_bits(imx_pcie->iomuxc_gpr, offset,
 			   IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
 			   enable ? IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN : 0);
+}
+
+static int imx8mm_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
+{
+	imx8mm_pcie_clkreq_override(imx_pcie, enable);
 	return 0;
 }
 
-- 
2.37.1