[PATCH] pci: Make Rockchip PCIe voltage regulators optional

[Kurt Miller <lists@intricatesoftware.com>]

On Sun, 2020-05-24 at 22:32 +0200, Mark Kettenis wrote:
> The vpcie*-supply properties are optional and these are absent on
> boards like the ROCKPro64 and Firefly RK3399 where the voltage is
> supplied by always-on regulators that are already enabled upon
> boot.??Make these regulators optional and properly check their
> presence before attempting to enable them.
> 
> Makes PCIe work on un U-Boot on the boards mentioned above.
> 
> Signed-off-by: Mark Kettenis <kettenis@openbsd.org>

Tested by: Kurt Miller <kurt@intricatesoftware.com>

Model: Pine64 RockPro64 v2.1

=> pci
Scanning PCI devices on bus 0
BusDevFun??VendorId???DeviceId???Device Class???????Sub-Class
_____________________________________________________________
00.00.00???0x1d87?????0x0100?????Bridge device???????????0x04
=> pci 1
Scanning PCI devices on bus 1
BusDevFun??VendorId???DeviceId???Device Class???????Sub-Class
_____________________________________________________________
01.00.00???0x1b4b?????0x9128?????Mass storage controller 0x06

> ---
> ?drivers/pci/pcie_rockchip.c | 33 ++++++++++++++++++++-------------
> ?1 file changed, 20 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/pci/pcie_rockchip.c b/drivers/pci/pcie_rockchip.c
> index 82a8396e42..0edc2464a8 100644
> --- a/drivers/pci/pcie_rockchip.c
> +++ b/drivers/pci/pcie_rockchip.c
> @@ -322,7 +322,7 @@ static int rockchip_pcie_set_vpcie(struct udevice *dev)
> ?	struct rockchip_pcie *priv = dev_get_priv(dev);
> ?	int ret;
> ?
> -	if (!IS_ERR(priv->vpcie3v3)) {
> +	if (priv->vpcie3v3) {
> ?		ret = regulator_set_enable(priv->vpcie3v3, true);
> ?		if (ret) {
> ?			dev_err(dev, "failed to enable vpcie3v3 (ret=%d)\n",
> @@ -331,24 +331,31 @@ static int rockchip_pcie_set_vpcie(struct udevice *dev)
> ?		}
> ?	}
> ?
> -	ret = regulator_set_enable(priv->vpcie1v8, true);
> -	if (ret) {
> -		dev_err(dev, "failed to enable vpcie1v8 (ret=%d)\n", ret);
> -		goto err_disable_3v3;
> +	if (priv->vpcie1v8) {
> +		ret = regulator_set_enable(priv->vpcie1v8, true);
> +		if (ret) {
> +			dev_err(dev, "failed to enable vpcie1v8 (ret=%d)\n",
> +				ret);
> +			goto err_disable_3v3;
> +		}
> ?	}
> ?
> -	ret = regulator_set_enable(priv->vpcie0v9, true);
> -	if (ret) {
> -		dev_err(dev, "failed to enable vpcie0v9 (ret=%d)\n", ret);
> -		goto err_disable_1v8;
> +	if (priv->vpcie0v9) {
> +		ret = regulator_set_enable(priv->vpcie0v9, true);
> +		if (ret) {
> +			dev_err(dev, "failed to enable vpcie0v9 (ret=%d)\n",
> +				ret);
> +			goto err_disable_1v8;
> +		}
> ?	}
> ?
> ?	return 0;
> ?
> ?err_disable_1v8:
> -	regulator_set_enable(priv->vpcie1v8, false);
> +	if (priv->vpcie1v8)
> +		regulator_set_enable(priv->vpcie1v8, false);
> ?err_disable_3v3:
> -	if (!IS_ERR(priv->vpcie3v3))
> +	if (priv->vpcie3v3)
> ?		regulator_set_enable(priv->vpcie3v3, false);
> ?	return ret;
> ?}
> @@ -424,14 +431,14 @@ static int rockchip_pcie_parse_dt(struct udevice *dev)
> ?
> ?	ret = device_get_supply_regulator(dev, "vpcie1v8-supply",
> ?					??&priv->vpcie1v8);
> -	if (ret) {
> +	if (ret && ret != -ENOENT) {
> ?		dev_err(dev, "failed to get vpcie1v8 supply (ret=%d)\n", ret);
> ?		return ret;
> ?	}
> ?
> ?	ret = device_get_supply_regulator(dev, "vpcie0v9-supply",
> ?					??&priv->vpcie0v9);
> -	if (ret) {
> +	if (ret && ret != -ENOENT) {
> ?		dev_err(dev, "failed to get vpcie0v9 supply (ret=%d)\n", ret);
> ?		return ret;
> ?	}