[PATCH] pci: Make Rockchip PCIe voltage regulators optional

[Kever Yang <kever.yang@rock-chips.com>]

On 2020/5/25 ??4:32, 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>

Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

Thanks,
- Kever
> ---
>   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;
>   	}