Commit 4a271cb1b4ff doesn't take into account that fdtdec_setup_gpio() returns success when the gpio passed to it is FDT_GPIO_NONE (no gpio node found in the fdtdec_decode_gpio() call). This results in calling gpio_direction_output() on invalid gpio. For this reason executing "usb start" command on Arndale causes data abort in the ehci-exynos driver.

Add the fdt_gpio_isvalid() check to fix that problem.

Signed-off-by: Andrey Konovalov andrey.konovalov@linaro.org Cc: Julius Werner jwerner@chromium.org Cc: Simon Glass sjg@chromium.org Cc: Minkyu Kang mk7.kang@samsung.com Cc: Marek Vasut marex@denx.de --- drivers/usb/host/ehci-exynos.c | 3 ++- drivers/usb/host/xhci-exynos5.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c index 9356878..edd91a8 100644 --- a/drivers/usb/host/ehci-exynos.c +++ b/drivers/usb/host/ehci-exynos.c @@ -197,7 +197,8 @@ int ehci_hcd_init(int index, enum usb_init_type init,

#ifdef CONFIG_OF_CONTROL /* setup the Vbus gpio here */ - if (!fdtdec_setup_gpio(&ctx->vbus_gpio)) + if (fdt_gpio_isvalid(&ctx->vbus_gpio) && + !fdtdec_setup_gpio(&ctx->vbus_gpio)) gpio_direction_output(ctx->vbus_gpio.gpio, 1); #endif

diff --git a/drivers/usb/host/xhci-exynos5.c b/drivers/usb/host/xhci-exynos5.c index 1146d10..b4946a3 100644 --- a/drivers/usb/host/xhci-exynos5.c +++ b/drivers/usb/host/xhci-exynos5.c @@ -298,7 +298,8 @@ int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)

#ifdef CONFIG_OF_CONTROL /* setup the Vbus gpio here */ - if (!fdtdec_setup_gpio(&ctx->vbus_gpio)) + if (fdt_gpio_isvalid(&ctx->vbus_gpio) && + !fdtdec_setup_gpio(&ctx->vbus_gpio)) gpio_direction_output(ctx->vbus_gpio.gpio, 1); #endif