[PATCH 09/13] pci: dwc: pcie-kirin: allow to optionally require a regulator

Mauro Carvalho Chehab
2021-02-02T13:31:14Z

On Hikey 970, there's a power supply controlled by Hi6421v600
regulator that turns on the PCI devices on the board. Without
that, no PCI hardware would work.

As this is device-dependent, such regulator line should be
optional.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
drivers/pci/controller/dwc/pcie-kirin.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index 2bce6e3750d4..42aea34dff4d 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"
@@ -295,6 +296,22 @@ static void kirin970_pcie_set_eyeparam(struct kirin_pcie *kirin_pcie)
static long kirin_common_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_optional(dev, "pci");
+ 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;
+ }
+ }
+
kirin_pcie->apb_base = devm_platform_ioremap_resource_byname(pdev,
"apb");
if (IS_ERR(kirin_pcie->apb_base))
--
2.29.2