diff options
| -rw-r--r-- | arch/arm/mach-imx/mach-imx6q.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c index b884209edaa6..7569722ff7ea 100644 --- a/arch/arm/mach-imx/mach-imx6q.c +++ b/arch/arm/mach-imx/mach-imx6q.c @@ -21,6 +21,7 @@ #include <linux/irqchip.h> #include <linux/of.h> #include <linux/of_address.h> +#include <linux/of_gpio.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/pm_opp.h> @@ -40,6 +41,37 @@ #include "cpuidle.h" #include "hardware.h" +/* The PCIe switch on the Apalis Evaluation Board requires to have its reset + * deasserted some time before the reset of the downstream endpoints. + * The downstream endpoints use RESET_MOCI while the PCIe switch uses GPIO7 + * for reset. + * Handle RESET_MOCI when the PCIe driver is not configured or disabled in + * the device tree */ +static void apalis_reset_moci(void) +{ + struct device_node *np; + int ret, reset_moci_gpio, no_pcie; +#ifdef CONFIG_PCI_IMX6 + no_pcie = 0; +#else + no_pcie = 1; +#endif + + np = of_find_node_by_name(NULL, "pcie"); + if (!of_device_is_available(np) || no_pcie) { + reset_moci_gpio = of_get_named_gpio(np, "reset-ep-gpio", 0); + if (gpio_is_valid(reset_moci_gpio)) { + ret = gpio_request_one(reset_moci_gpio, + GPIOF_OUT_INIT_LOW, + "RESET_MOCI"); + if (ret) { + pr_err("%s(): unable to get RESET_MOCI gpio" + " from dt pcie node\n", __func__); + } + } + } +} + /* For imx6q sabrelite board: set KSZ9021RN RGMII pad skew */ static int ksz9021rn_phy_fixup(struct phy_device *phydev) { @@ -335,6 +367,9 @@ static void __init imx6q_init_machine(void) imx6q_csi_mux_init(); cpu_is_imx6q() ? imx6q_pm_init() : imx6dl_pm_init(); imx6q_axi_init(); + + if (of_machine_is_compatible("toradex,apalis_imx6q")) + apalis_reset_moci(); } #define OCOTP_CFG3 0x440 |