Support providing the PERST# reset signal through a devicetree binding.
Thus the system no longer relies on external components to perform the
bus reset.
Signed-off-by: Mike Looijmans <mike.looijmans@xxxxxxxx>
---
Changes in v2:
Split into "reset GPIO" and "wait for link" patches
Handle GPIO defer and/or errors
drivers/pci/controller/pcie-xilinx.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 2e59b91f43e0..e191ab95d669 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -18,6 +18,7 @@
#include <linux/iopoll.h>
#include <linux/msi.h>
#include <linux/of_address.h>
+#include <linux/of_gpio.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/of_irq.h>
@@ -577,11 +578,17 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct xilinx_pcie *pcie;
struct pci_host_bridge *bridge;
+ struct gpio_desc *perst_gpio;
int err;
if (!dev->of_node)
return -ENODEV;
+ perst_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(perst_gpio))
+ return dev_err_probe(dev, PTR_ERR(perst_gpio),
+ "reset-gpios request failed\n");
+
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
if (!bridge)
return -ENODEV;
@@ -596,6 +603,13 @@ static int xilinx_pcie_probe(struct platform_device *pdev)
return err;
}
+ if (perst_gpio) {
+ usleep_range(10, 20); /* Assert the reset for ~10 us */
+ gpiod_set_value_cansleep(perst_gpio, 0);
+ /* Initial delay to provide endpoint time to restart */
+ usleep_range(1000, 2000);
+ }
+
xilinx_pcie_init_port(pcie);
err = xilinx_pcie_init_irq_domain(pcie);
--
2.43.0
Met vriendelijke groet / kind regards,
Mike Looijmans
System Expert
TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands
T: +31 (0) 499 33 69 69
E: mike.looijmans@xxxxxxxx
W: www.topic.nl
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