* [PATCH v5 1/2] dt-bindings: imx6q-pcie: Add "vph-supply" for PHY supply voltage
2021-05-28 6:29 [PATCH v5 0/2] PCI: imx6: add one regulator used to power up pcie phy Richard Zhu
@ 2021-05-28 6:29 ` Richard Zhu
2021-06-03 16:19 ` [PATCH v5 1/2] dt-bindings: imx6q-pcie: Add "vph-supply" for PHY supply voltageg Lorenzo Pieralisi
2021-05-28 6:29 ` [PATCH v5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V Richard Zhu
1 sibling, 1 reply; 4+ messages in thread
From: Richard Zhu @ 2021-05-28 6:29 UTC (permalink / raw)
To: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
lorenzo.pieralisi
Cc: linux-pci, linux-imx, linux-arm-kernel, linux-kernel, kernel,
Richard Zhu
The i.MX8MQ PCIe PHY can use either a 1.8V or a 3.3V power supply.
Add a "vph-supply" property to indicate which regulator supplies
power for the PHY.
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
---
Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt | 3 +++
1 file changed, 3 insertions(+)
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index de4b2baf91e8..d8971ab99274 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -38,6 +38,9 @@ Optional properties:
The regulator will be enabled when initializing the PCIe host and
disabled either as part of the init process or when shutting down the
host.
+- vph-supply: Should specify the regulator in charge of VPH one of the three
+ PCIe PHY powers. This regulator can be supplied by both 1.8v and 3.3v voltage
+ supplies.
Additional required properties for imx6sx-pcie:
- clock names: Must include the following additional entries:
--
2.17.1
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* [PATCH v5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V
2021-05-28 6:29 [PATCH v5 0/2] PCI: imx6: add one regulator used to power up pcie phy Richard Zhu
2021-05-28 6:29 ` [PATCH v5 1/2] dt-bindings: imx6q-pcie: Add "vph-supply" for PHY supply voltage Richard Zhu
@ 2021-05-28 6:29 ` Richard Zhu
1 sibling, 0 replies; 4+ messages in thread
From: Richard Zhu @ 2021-05-28 6:29 UTC (permalink / raw)
To: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
lorenzo.pieralisi
Cc: linux-pci, linux-imx, linux-arm-kernel, linux-kernel, kernel,
Richard Zhu
The i.MX8MQ PCIe PHY needs 1.8V in default but can be supplied by
either a 1.8V or a 3.3V regulator.
The "vph-supply" DT property tells us which external regulator
supplies the PHY. If that regulator supplies anything over 3V,
enable the PHY's internal 3.3V-to-1.8V regulator.
Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
---
drivers/pci/controller/dwc/pci-imx6.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 853ea8e82952..94b43b4ecca1 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -37,6 +37,7 @@
#define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
+#define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12)
#define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
#define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000
@@ -80,6 +81,7 @@ struct imx6_pcie {
u32 tx_swing_full;
u32 tx_swing_low;
struct regulator *vpcie;
+ struct regulator *vph;
void __iomem *phy_base;
/* power domain for pcie */
@@ -621,6 +623,17 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
imx6_pcie_grp_offset(imx6_pcie),
IMX8MQ_GPR_PCIE_REF_USE_PAD,
IMX8MQ_GPR_PCIE_REF_USE_PAD);
+ /*
+ * Regarding the datasheet, the PCIE_VPH is suggested
+ * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
+ * VREG_BYPASS should be cleared to zero.
+ */
+ if (imx6_pcie->vph &&
+ regulator_get_voltage(imx6_pcie->vph) > 3000000)
+ regmap_update_bits(imx6_pcie->iomuxc_gpr,
+ imx6_pcie_grp_offset(imx6_pcie),
+ IMX8MQ_GPR_PCIE_VREG_BYPASS,
+ 0);
break;
case IMX7D:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -1130,6 +1143,13 @@ static int imx6_pcie_probe(struct platform_device *pdev)
imx6_pcie->vpcie = NULL;
}
+ imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev, "vph");
+ if (IS_ERR(imx6_pcie->vph)) {
+ if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
+ return PTR_ERR(imx6_pcie->vph);
+ imx6_pcie->vph = NULL;
+ }
+
platform_set_drvdata(pdev, imx6_pcie);
ret = imx6_pcie_attach_pd(dev);
--
2.17.1
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