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charset="utf-8" Add one more reference clock "extref" for a reference clock that comes from external crystal oscillator. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- .../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..0134a759185e 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 an internal PLL, the other from an off-chip c= rystal + oscillator. If present, 'extref' refers to a reference clock f= rom + an external oscillator. + const: extref - description: Clock for the PHY registers interface. 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charset="utf-8" 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 from external crystal oscillator. Add one more external reference clock for i.MX95 PCIes. Signed-off-by: Richard Zhu Reviewed-by: Frank Li --- Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml | 3 +++ 1 file changed, 3 insertions(+) diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml b/Do= cumentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml index ca5f2970f217..b4c40d0573dc 100644 --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.yaml @@ -212,14 +212,17 @@ allOf: then: properties: clocks: + minItems: 4 maxItems: 5 clock-names: + minItems: 4 items: - const: pcie - const: pcie_bus - const: pcie_phy - const: pcie_aux - const: ref + - const: extref # Optional =20 unevaluatedProperties: false =20 --=20 2.37.1 From nobody Thu Oct 2 11:51:11 2025 Received: from DB3PR0202CU003.outbound.protection.outlook.com (mail-northeuropeazon11010070.outbound.protection.outlook.com [52.101.84.70]) (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 4A1AD277C8C; 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charset="utf-8" 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 from external crystal oscillator. Add external reference clock mode support when extref clock is present. 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 80e48746bbaf..e2ca8b036253 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; } @@ -1606,7 +1608,7 @@ 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); @@ -1657,6 +1659,10 @@ 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 false; + for (i =3D 0; i < imx_pcie->num_clks; i++) + if (strncmp(imx_pcie->clks[i].id, "extref", 6) =3D=3D 0) + imx_pcie->enable_ext_refclk =3D true; =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