Re: [PATCH] PCI: histb: add power control GPIO for PCIe slot

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Hi Shawn,

On Tue, Jan 23, 2018 at 09:04:37AM +0800, Shawn Guo wrote:
> From: Jianguo Sun <sunjianguo1@xxxxxxxxxx>
> 
> Besides the GPIO for controlling reset, there is also possibly another
> GPIO for turning on/off the power of PCIe slot.  Let's add the support
> for that with another optional device tree property 'power-gpios'.
> 
> Signed-off-by: Jianguo Sun <sunjianguo1@xxxxxxxxxx>
> Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxx>
> ---
>  .../bindings/pci/hisilicon-histb-pcie.txt          |  1 +
>  drivers/pci/dwc/pcie-histb.c                       | 28 +++++++++++++++++++---

Is there a dependency between this patch and this series:

https://patchwork.ozlabs.org/project/linux-pci/list/?series=31410

It does not look like, I'd apply the series but I wanted to ask
first.

This patch misses Rob's ACK.

Thanks,
Lorenzo

>  2 files changed, 26 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> index c84bc027930b..597397a048f8 100644
> --- a/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/hisilicon-histb-pcie.txt
> @@ -33,6 +33,7 @@ Required properties
>    "bus": bus reset.
>  
>  Optional properties:
> +- power-gpios: The gpio to control the power of PCIe slot.
>  - reset-gpios: The gpio to generate PCIe PERST# assert and deassert signal.
>  - 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 33b01b734d7d..2a6b18619b25 100644
> --- a/drivers/pci/dwc/pcie-histb.c
> +++ b/drivers/pci/dwc/pcie-histb.c
> @@ -63,6 +63,7 @@ struct histb_pcie {
>  	struct reset_control *sys_reset;
>  	struct reset_control *bus_reset;
>  	void __iomem *ctrl;
> +	int power_gpio;
>  	int reset_gpio;
>  };
>  
> @@ -230,6 +231,8 @@ 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 (gpio_is_valid(hipcie->power_gpio))
> +		gpio_set_value_cansleep(hipcie->power_gpio, 0);
>  }
>  
>  static int histb_pcie_host_enable(struct pcie_port *pp)
> @@ -240,8 +243,14 @@ static int histb_pcie_host_enable(struct pcie_port *pp)
>  	int ret;
>  
>  	/* power on PCIe device if have */
> -	if (gpio_is_valid(hipcie->reset_gpio))
> +	if (gpio_is_valid(hipcie->power_gpio))
> +		gpio_set_value_cansleep(hipcie->power_gpio, 1);
> +
> +	if (gpio_is_valid(hipcie->reset_gpio)) {
> +		gpio_set_value_cansleep(hipcie->reset_gpio, 0);
> +		mdelay(10);
>  		gpio_set_value_cansleep(hipcie->reset_gpio, 1);
> +	}
>  
>  	ret = clk_prepare_enable(hipcie->bus_clk);
>  	if (ret) {
> @@ -335,15 +344,28 @@ static int histb_pcie_probe(struct platform_device *pdev)
>  		return PTR_ERR(pci->dbi_base);
>  	}
>  
> +	hipcie->power_gpio = of_get_named_gpio_flags(np,
> +				"power-gpios", 0, &of_flags);
> +	if (of_flags & OF_GPIO_ACTIVE_LOW)
> +		flag |= GPIOF_ACTIVE_LOW;
> +	if (gpio_is_valid(hipcie->power_gpio)) {
> +		ret = devm_gpio_request_one(dev, hipcie->power_gpio,
> +				flag, "PCIe device power control");
> +		if (ret) {
> +			dev_err(dev, "unable to request power gpio\n");
> +			return ret;
> +		}
> +	}
> +
>  	hipcie->reset_gpio = of_get_named_gpio_flags(np,
>  				"reset-gpios", 0, &of_flags);
>  	if (of_flags & OF_GPIO_ACTIVE_LOW)
>  		flag |= GPIOF_ACTIVE_LOW;
>  	if (gpio_is_valid(hipcie->reset_gpio)) {
>  		ret = devm_gpio_request_one(dev, hipcie->reset_gpio,
> -				flag, "PCIe device power control");
> +				flag, "PCIe device reset control");
>  		if (ret) {
> -			dev_err(dev, "unable to request gpio\n");
> +			dev_err(dev, "unable to request reset gpio\n");
>  			return ret;
>  		}
>  	}
> -- 
> 1.9.1
> 
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