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charset="utf-8" Add one more reference clock "extref" to be onhalf the reference clock that comes from external crystal oscillator. Signed-off-by: Richard Zhu --- .../devicetree/bindings/pci/snps,dw-pcie-common.yaml | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml= b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml index 34594972d8db..ee09e0d3bbab 100644 --- a/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml +++ b/Documentation/devicetree/bindings/pci/snps,dw-pcie-common.yaml @@ -105,6 +105,12 @@ properties: define it with this name (for instance pipe, core and aux can be connected to a single source of the periodic signal). const: ref + - description: + Some dwc wrappers (like i.MX95 PCIes) have two reference clock + inputs, one from internal PLL, the other from off chip crystal + oscillator. Use extref clock name to be onhalf of the reference + clock comes form external crystal oscillator. + const: extref - description: Clock for the PHY registers interface. 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charset="utf-8" On i.MX, the PCIe reference clock might come from either internal system PLL or external clock source. Add the external reference clock source for reference clock. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Do= cumentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml index ca5f2970f217..a45876aba4da 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml @@ -219,7 +219,12 @@ allOf: - const: pcie_bus - const: pcie_phy - const: pcie_aux - - const: ref + - description: PCIe reference clock. + oneOf: + - description: The controller might be configured clocking + coming in from either an internal system PLL or an + external clock source. + enum: [ref, extref] =20 unevaluatedProperties: false =20 --=20 2.37.1 From nobody Wed Oct 8 16:10:07 2025 Received: from OSPPR02CU001.outbound.protection.outlook.com (mail-norwayeastazon11013003.outbound.protection.outlook.com [40.107.159.3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D0F82517A5; 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charset="utf-8" The PCI Express reference clock of i.MX9 PCIes might come from external clock source. Add the external reference clock mode support. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- drivers/pci/controller/dwc/pci-imx6.c | 20 +++++++++++++------- 1 file changed, 13 insertions(+), 7 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index 5a38cfaf989b..9309959874c0 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -149,6 +149,7 @@ struct imx_pcie { struct gpio_desc *reset_gpiod; struct clk_bulk_data *clks; int num_clks; + bool enable_ext_refclk; struct regmap *iomuxc_gpr; u16 msi_ctrl; u32 controller_id; @@ -241,6 +242,8 @@ static unsigned int imx_pcie_grp_offset(const struct im= x_pcie *imx_pcie) =20 static int imx95_pcie_init_phy(struct imx_pcie *imx_pcie) { + bool ext =3D imx_pcie->enable_ext_refclk; + /* * ERR051624: The Controller Without Vaux Cannot Exit L23 Ready * Through Beacon or PERST# De-assertion @@ -259,13 +262,12 @@ static int imx95_pcie_init_phy(struct imx_pcie *imx_p= cie) IMX95_PCIE_PHY_CR_PARA_SEL, IMX95_PCIE_PHY_CR_PARA_SEL); =20 - regmap_update_bits(imx_pcie->iomuxc_gpr, - IMX95_PCIE_PHY_GEN_CTRL, - IMX95_PCIE_REF_USE_PAD, 0); - regmap_update_bits(imx_pcie->iomuxc_gpr, - IMX95_PCIE_SS_RW_REG_0, + regmap_update_bits(imx_pcie->iomuxc_gpr, IMX95_PCIE_PHY_GEN_CTRL, + ext ? IMX95_PCIE_REF_USE_PAD : 0, + IMX95_PCIE_REF_USE_PAD); + regmap_update_bits(imx_pcie->iomuxc_gpr, IMX95_PCIE_SS_RW_REG_0, IMX95_PCIE_REF_CLKEN, - IMX95_PCIE_REF_CLKEN); + ext ? 0 : IMX95_PCIE_REF_CLKEN); =20 return 0; } @@ -1600,7 +1602,7 @@ static int imx_pcie_probe(struct platform_device *pde= v) struct imx_pcie *imx_pcie; struct device_node *np; struct device_node *node =3D dev->of_node; - int ret, domain; + int i, ret, domain; u16 val; =20 imx_pcie =3D devm_kzalloc(dev, sizeof(*imx_pcie), GFP_KERNEL); @@ -1651,6 +1653,10 @@ static int imx_pcie_probe(struct platform_device *pd= ev) if (imx_pcie->num_clks < 0) return dev_err_probe(dev, imx_pcie->num_clks, "failed to get clocks\n"); + imx_pcie->enable_ext_refclk =3D true; + for (i =3D 0; i < imx_pcie->num_clks; i++) + if (strncmp(imx_pcie->clks[i].id, "ref", 3) =3D=3D 0) + imx_pcie->enable_ext_refclk =3D false; =20 if (imx_check_flag(imx_pcie, IMX_PCIE_FLAG_HAS_PHYDRV)) { imx_pcie->phy =3D devm_phy_get(dev, "pcie-phy"); --=20 2.37.1