[PATCH 2/2] PCI: imx6: Add reset-gpio-active-high boolean property to DT

[Petr Štetiar]

We need that property in order to make the Toradex Apalis SoMs working
without breaking old DTBs. On Apalis SoMs the GPIO1_IO28 used to PCIe
reset is not connected directly to PERST# PCIe signal, but it's ORed
with RESETBMCU coming off the PMIC, and thus is inverted, active-high.

Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 drivers/pci/host/pci-imx6.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 2f817fa..1b3bcfe 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -33,6 +33,7 @@
 
 struct imx6_pcie {
 	int			reset_gpio;
+	bool			gpio_active_high;
 	struct clk		*pcie_bus;
 	struct clk		*pcie_phy;
 	struct clk		*pcie;
@@ -310,9 +311,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
 
 	/* Some boards don't have PCIe reset GPIO. */
 	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
-		gpio_set_value_cansleep(imx6_pcie->reset_gpio, 0);
+		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
+					!!imx6_pcie->gpio_active_high);
 		msleep(100);
-		gpio_set_value_cansleep(imx6_pcie->reset_gpio, 1);
+		gpio_set_value_cansleep(imx6_pcie->reset_gpio,
+					!imx6_pcie->gpio_active_high);
 	}
 	return 0;
 
@@ -546,9 +549,14 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
 
 	/* Fetch GPIOs */
 	imx6_pcie->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
+	imx6_pcie->gpio_active_high = of_property_read_bool(np,
+						"reset-gpio-active-high");
 	if (gpio_is_valid(imx6_pcie->reset_gpio)) {
 		ret = devm_gpio_request_one(&pdev->dev, imx6_pcie->reset_gpio,
-					    GPIOF_OUT_INIT_LOW, "PCIe reset");
+				imx6_pcie->gpio_active_high ?
+					GPIOF_OUT_INIT_HIGH :
+					GPIOF_OUT_INIT_LOW,
+				"PCIe reset");
 		if (ret) {
 			dev_err(&pdev->dev, "unable to get reset gpio\n");
 			return ret;
-- 
1.9.1