mvebu: pcie: Add support for GPIO reset for PCIe device
Add support for "marvell,reset-gpio" property to mvebu DW PCIe
driver.
This option is valid when CONFIG_DM_GPIO=y
Change-Id: Ic17c500449050c2fbb700731f1a9ca8b83298986
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
Signed-off-by: Rabeeh Khoury <rabeeh@solid-run.com>
Cc: Stefan Roese <sr@denx.de>
Cc: Nadav Haklai <nadavh@marvell.com>
Cc: Neta Zur Hershkovits <neta@marvell.com>
Cc: Igal Liberman <igall@marvell.com>
Cc: Haim Boot <hayim@marvell.com>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/drivers/pci/pcie_dw_mvebu.c b/drivers/pci/pcie_dw_mvebu.c
index 17fa024..d4776a9 100644
--- a/drivers/pci/pcie_dw_mvebu.c
+++ b/drivers/pci/pcie_dw_mvebu.c
@@ -15,6 +15,7 @@
#include <dm.h>
#include <pci.h>
#include <asm/io.h>
+#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -461,6 +462,25 @@
struct pcie_dw_mvebu *pcie = dev_get_priv(dev);
struct udevice *ctlr = pci_get_controller(dev);
struct pci_controller *hose = dev_get_uclass_priv(ctlr);
+#ifdef CONFIG_DM_GPIO
+ struct gpio_desc reset_gpio;
+
+ gpio_request_by_name(dev, "marvell,reset-gpio", 0, &reset_gpio,
+ GPIOD_IS_OUT);
+ /*
+ * Issue reset to add-in card trough the dedicated GPIO.
+ * Some boards are connecting the card reset pin to common system
+ * reset wire and others are using separate GPIO port.
+ * In the last case we have to release a reset of the addon card
+ * using this GPIO.
+ */
+ if (dm_gpio_is_valid(&reset_gpio)) {
+ dm_gpio_set_value(&reset_gpio, 1);
+ mdelay(200);
+ }
+#else
+ debug("PCIE Reset on GPIO support is missing\n");
+#endif /* CONFIG_DM_GPIO */
pcie->first_busno = dev->seq;