diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2017-07-03 16:00:32 +0300 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2017-07-03 16:00:32 +0300 |
| commit | beaba77cf23f1734fc06ea90932526567c95ac25 (patch) | |
| tree | 09dd793c1e1c2f8e35b84fc9f99e4fcfc23bdadc /drivers/pci/dwc | |
| parent | 85e4b30a2c6f40f25bad2226840dc98ec2854603 (diff) | |
| parent | c26ebe98a103479dae9284fe0a86a95af4a5cd46 (diff) | |
| download | linux-beaba77cf23f1734fc06ea90932526567c95ac25.tar.xz | |
Merge branch 'pci/host-imx6' into next
* pci/host-imx6:
PCI: imx6: Add regulator support
Diffstat (limited to 'drivers/pci/dwc')
| -rw-r--r-- | drivers/pci/dwc/pci-imx6.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c index 7a8968d0f501..bf5c3616e344 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 */ @@ -284,6 +286,8 @@ static int imx6q_pcie_abort_handler(unsigned long addr, static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie) { + struct device *dev = imx6_pcie->pci->dev; + switch (imx6_pcie->variant) { case IMX7D: reset_control_assert(imx6_pcie->pciephy_reset); @@ -310,6 +314,14 @@ 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) + dev_err(dev, "failed to disable vpcie regulator: %d\n", + ret); + } } static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie) @@ -376,10 +388,19 @@ 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 +460,13 @@ err_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 +830,13 @@ 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); |