diff options
| author | Shawn Guo <shawn.guo@linaro.org> | 2018-03-02 02:12:01 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2018-03-07 17:24:27 +0100 |
| commit | 58dfb24349e1d0aa6461d2b0f2811b46fe350280 (patch) | |
| tree | 93ae2e1c48dfb25305d015c2745e269f804dc8be /drivers/pci/dwc | |
| parent | PCI: histb: Fix error path of histb_pcie_host_enable() (diff) | |
| download | linux-58dfb24349e1d0aa6461d2b0f2811b46fe350280.tar.xz linux-58dfb24349e1d0aa6461d2b0f2811b46fe350280.zip | |
PCI: histb: Add an optional regulator for PCIe port power control
The power supplies to PCIe port are often controlled by GPIO on some board
designs. Let's add an optional regulator which can be backed by GPIO to
control the power.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/pci/dwc')
| -rw-r--r-- | drivers/pci/dwc/pcie-histb.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/pci/dwc/pcie-histb.c b/drivers/pci/dwc/pcie-histb.c index 17ed604f5741..4cef0a514944 100644 --- a/drivers/pci/dwc/pcie-histb.c +++ b/drivers/pci/dwc/pcie-histb.c @@ -61,6 +61,7 @@ struct histb_pcie { struct reset_control *bus_reset; void __iomem *ctrl; int reset_gpio; + struct regulator *vpcie; }; static u32 histb_pcie_readl(struct histb_pcie *histb_pcie, u32 reg) @@ -227,6 +228,9 @@ static void histb_pcie_host_disable(struct histb_pcie *hipcie) if (gpio_is_valid(hipcie->reset_gpio)) gpio_set_value_cansleep(hipcie->reset_gpio, 0); + + if (hipcie->vpcie) + regulator_disable(hipcie->vpcie); } static int histb_pcie_host_enable(struct pcie_port *pp) @@ -237,6 +241,14 @@ static int histb_pcie_host_enable(struct pcie_port *pp) int ret; /* power on PCIe device if have */ + if (hipcie->vpcie) { + ret = regulator_enable(hipcie->vpcie); + if (ret) { + dev_err(dev, "failed to enable regulator: %d\n", ret); + return ret; + } + } + if (gpio_is_valid(hipcie->reset_gpio)) gpio_set_value_cansleep(hipcie->reset_gpio, 1); @@ -282,6 +294,8 @@ err_pipe_clk: err_sys_clk: clk_disable_unprepare(hipcie->bus_clk); err_bus_clk: + if (hipcie->vpcie) + regulator_disable(hipcie->vpcie); return ret; } @@ -331,6 +345,13 @@ static int histb_pcie_probe(struct platform_device *pdev) return PTR_ERR(pci->dbi_base); } + hipcie->vpcie = devm_regulator_get_optional(dev, "vpcie"); + if (IS_ERR(hipcie->vpcie)) { + if (PTR_ERR(hipcie->vpcie) == -EPROBE_DEFER) + return -EPROBE_DEFER; + hipcie->vpcie = NULL; + } + hipcie->reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0, &of_flags); if (of_flags & OF_GPIO_ACTIVE_LOW) |