diff mbox series

[v2,08/11] PCI: dwc: pcie-kirin: add support for a regulator

Message ID f2ddbc72b378bd28cc249da6e3135c7d7bad5af4.1612335031.git.mchehab+huawei@kernel.org (mailing list archive)
State New
Delegated to: Lorenzo Pieralisi
Headers show
Series Add support for Hikey 970 PCIe | expand

Commit Message

Mauro Carvalho Chehab Feb. 3, 2021, 7:01 a.m. UTC
On Kirin 970 designs, a power supply is required to enable
a PCI bridge and other components of the board.

For instance, on HiKey 970, the Hi6421v600 regulator provides a
power line (LDO33) which powers on the PCI bridge, the M.2 slot,
the mini PCIe 1x slot and the Realtek 8169 Ethernet card.

Without enabling such power supply, the PCI resource allocation
fails.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 drivers/pci/controller/dwc/pcie-kirin.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 2bce6e3750d4..005fc4c2ad7f 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -22,6 +22,7 @@ 
 #include <linux/pci_regs.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
 #include <linux/resource.h>
 #include <linux/types.h>
 #include "pcie-designware.h"
@@ -335,8 +336,21 @@  static long kirin970_pcie_get_resource(struct kirin_pcie *kirin_pcie,
 				      struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct regulator *reg;
 	int ret;
 
+	reg = devm_regulator_get(dev, "pcie_vdd");
+	if (IS_ERR_OR_NULL(reg)) {
+		if (PTR_ERR(reg) == -EPROBE_DEFER)
+		    return PTR_ERR(reg);
+	} else {
+		ret = regulator_enable(reg);
+		if (ret) {
+			dev_err(dev, "Failed to enable regulator\n");
+			return ret;
+		}
+	}
+
 	kirin970_pcie_get_eyeparam(kirin_pcie);
 
 	kirin_pcie->gpio_id_reset[0] = of_get_named_gpio(dev->of_node,