On Tue, Jan 23, 2018 at 11:45:37PM +0800, Shawn Guo wrote:
> The power supply 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@xxxxxxxxxx>
> ---
> .../bindings/pci/hisilicon-histb-pcie.txt | 1 +
> drivers/pci/dwc/pcie-histb.c | 21 +++++++++++++++++++++
> 2 files changed, 22 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> index c84bc027930b..f995664e6d7f 100644
> --- a/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> @@ -34,6 +34,7 @@ Required properties
>
> Optional properties:
> - reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal.
> +- vpcie-supply: Should specify the regulator in charge of PCIe port power.
s/Should specify the/The/
> - phys: List of phandle and phy mode specifier, should be 0.
> - phy-names: Must be "phy".
>
> diff --git a/drivers/pci/dwc/pcie-histb.c b/drivers/pci/dwc/pcie-histb.c
> index 6395394be5b4..8eb3028432b3 100644
> --- a/drivers/pci/dwc/pcie-histb.c
> +++ b/drivers/pci/dwc/pcie-histb.c
> @@ -64,6 +64,7 @@ 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)
> @@ -230,6 +231,9 @@ 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)
> @@ -240,6 +244,14 @@ 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);
>
> @@ -285,6 +297,8 @@ 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;
> }
> @@ -334,6 +348,13 @@ 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)
> --
> 1.9.1
>
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