> -----Original Message----- > From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > Sent: Friday, June 16, 2017 5:06 AM > To: Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx> > Cc: Richard Zhu <hongxing.zhu@xxxxxxx>; l.stach@xxxxxxxxxxxxxx; > bhelgaas@xxxxxxxxxx; robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; > thomas.petazzoni@xxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx; linux- > pci@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; linux-arm- > kernel@xxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH] PCI: imx6: add regulator support > > On Thu, Jun 08, 2017 at 10:07:42AM +0200, Quentin Schulz wrote: > > Some boards might require to control a regulator to power the PCIe port. > > > > This adds support for an optional regulator defined in Device Tree > > linked in the PCIe controller under `vpcie-supply`. If present, the > > regulator will be disabled and then enabled as part of the PCIe host > > initialization process and will be disabled when shutting down. > > > > Signed-off-by: Quentin Schulz <quentin.schulz@xxxxxxxxxxxxxxxxxx> > > Waiting for ack from Richard or Lucas. [Zhu hongxing] Sorry to replay late. This patch is okay for me. Thanks. Acked-by: Richard Zhu <hongxing.zhu@xxxxxxx> > > > --- > > .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 4 +++ > > drivers/pci/dwc/pci-imx6.c | 34 +++++++++++++++++++++- > > 2 files changed, 37 insertions(+), 1 deletion(-) > > > > diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > > b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > > index e3d5680875b1..cf92d3ba5a26 100644 > > --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > > +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt > > @@ -33,6 +33,10 @@ Optional properties: > > - reset-gpio-active-high: If present then the reset sequence using the > GPIO > > specified in the "reset-gpio" property is reversed (H=reset state, > > L=operation state). > > +- vpcie-supply: Should specify the regulator in charge of PCIe port power. > > + 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. > > > > Additional required properties for imx6sx-pcie: > > - clock names: Must include the following additional entries: > > diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c > > index 19a289b8cc94..f9b7500c9aff 100644 > > --- a/drivers/pci/dwc/pci-imx6.c > > +++ b/drivers/pci/dwc/pci-imx6.c > > @@ -24,6 +24,7 @@ > > #include <linux/pci.h> > > #include <linux/platform_device.h> > > #include <linux/regmap.h> > > +#include <linux/regulator/consumer.h> > > #include <linux/resource.h> > > #include <linux/signal.h> > > #include <linux/types.h> > > @@ -59,6 +60,7 @@ struct imx6_pcie { > > u32 tx_swing_full; > > u32 tx_swing_low; > > int link_gen; > > + struct regulator *vpcie; > > }; > > > > /* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */ @@ > > -310,6 +312,13 @@ static void imx6_pcie_assert_core_reset(struct > imx6_pcie *imx6_pcie) > > IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16); > > break; > > } > > + > > + if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) > { > > + int ret = regulator_disable(imx6_pcie->vpcie); > > + > > + if (ret) > > + pr_err("failed to disable vpcie regulator: %d\n", ret); > > + } > > } > > > > static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) @@ > > -376,10 +385,19 @@ static void imx6_pcie_deassert_core_reset(struct > imx6_pcie *imx6_pcie) > > struct device *dev = pci->dev; > > int ret; > > > > + if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) { > > + ret = regulator_enable(imx6_pcie->vpcie); > > + if (ret) { > > + dev_err(dev, "failed to enable vpcie regulator: %d\n", > > + ret); > > + return; > > + } > > + } > > + > > ret = clk_prepare_enable(imx6_pcie->pcie_phy); > > if (ret) { > > dev_err(dev, "unable to enable pcie_phy clock\n"); > > - return; > > + goto err_pcie_phy; > > } > > > > ret = clk_prepare_enable(imx6_pcie->pcie_bus); > > @@ -439,6 +457,13 @@ static void imx6_pcie_deassert_core_reset(struct > imx6_pcie *imx6_pcie) > > clk_disable_unprepare(imx6_pcie->pcie_bus); > > err_pcie_bus: > > clk_disable_unprepare(imx6_pcie->pcie_phy); > > +err_pcie_phy: > > + if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0) > { > > + ret = regulator_disable(imx6_pcie->vpcie); > > + if (ret) > > + dev_err(dev, "failed to disable vpcie regulator: %d\n", > > + ret); > > + } > > } > > > > static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie) @@ -802,6 > > +827,13 @@ static int imx6_pcie_probe(struct platform_device *pdev) > > if (ret) > > imx6_pcie->link_gen = 1; > > > > + imx6_pcie->vpcie = devm_regulator_get_optional(&pdev->dev, > "vpcie"); > > + if (IS_ERR(imx6_pcie->vpcie)) { > > + if (PTR_ERR(imx6_pcie->vpcie) == -EPROBE_DEFER) > > + return -EPROBE_DEFER; > > + imx6_pcie->vpcie = NULL; > > + } > > + > > platform_set_drvdata(pdev, imx6_pcie); > > > > ret = imx6_add_pcie_port(imx6_pcie, pdev); > > -- > > 2.11.0 > > > > > > _______________________________________________ > > linux-arm-kernel mailing list > > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
