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: devicetree@vger.kernel.org, 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: [RESEND, V5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V Date: Fri, 4 Jun 2021 09:47:49 +0800 [thread overview] Message-ID: <1622771269-13844-3-git-send-email-hongxing.zhu@nxp.com> (raw) In-Reply-To: <1622771269-13844-1-git-send-email-hongxing.zhu@nxp.com> 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
WARNING: multiple messages have this Message-ID (diff)
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: devicetree@vger.kernel.org, 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: [RESEND, V5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V Date: Fri, 4 Jun 2021 09:47:49 +0800 [thread overview] Message-ID: <1622771269-13844-3-git-send-email-hongxing.zhu@nxp.com> (raw) In-Reply-To: <1622771269-13844-1-git-send-email-hongxing.zhu@nxp.com> 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-06-04 2:05 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-04 1:47 [RESEND, V5 0/2] add one regulator used to power up pcie phy Richard Zhu 2021-06-04 1:47 ` Richard Zhu 2021-06-04 1:47 ` [RESEND, V5 1/2] dt-bindings: imx6q-pcie: Add "vph-supply" for PHY supply voltage Richard Zhu 2021-06-04 1:47 ` Richard Zhu 2021-06-10 16:16 ` Rob Herring 2021-06-10 16:16 ` Rob Herring 2021-06-04 1:47 ` Richard Zhu [this message] 2021-06-04 1:47 ` [RESEND, V5 2/2] PCI: imx6: Enable PHY internal regulator when supplied >3V Richard Zhu 2021-06-22 10:26 ` [RESEND, V5 0/2] add one regulator used to power up pcie phy Lorenzo Pieralisi 2021-06-22 10:26 ` Lorenzo Pieralisi
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