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PCI: histb: Add an optional regulator for PCIe port power control

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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>
This commit is contained in:
Shawn Guo 2018-03-02 09:12:01 +08:00 committed by Lorenzo Pieralisi
parent db0c25f8aa
commit 58dfb24349
2 changed files with 22 additions and 0 deletions
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1
Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
View File

@ -34,6 +34,7 @@ Required properties
Optional properties:
- reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal.
- vpcie-supply: The regulator in charge of PCIe port power.
- phys: List of phandle and phy mode specifier, should be 0.
- phy-names: Must be "phy".

21
drivers/pci/dwc/pcie-histb.c
View File

@ -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 @@ static int histb_pcie_host_enable(struct pcie_port *pp)
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)