dm: usb: tegra: Tidy up error handling and a static function

Try to return useful error numbers where possible. Also avoid swallowing
an error number when it is returned by a called function.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Marek Vasut <marex@denx.de>

diff --git a/drivers/usb/host/ehci-tegra.c b/drivers/usb/host/ehci-tegra.c
index 811c317..36a5b72 100644 (file)
--- a/drivers/usb/host/ehci-tegra.c
+++ b/drivers/usb/host/ehci-tegra.c
@@ -266,7 +266,8 @@ static void set_up_vbus(struct fdt_usb *config, enum usb_init_type init)
        }
 }
 
-void usbf_reset_controller(struct fdt_usb *config, struct usb_ctlr *usbctlr)
+static void usbf_reset_controller(struct fdt_usb *config,
+                                 struct usb_ctlr *usbctlr)
 {
        /* Reset the USB controller with 2us delay */
        reset_periph(config->periph_id, 2);
@@ -524,7 +525,7 @@ static int init_utmi_usb_controller(struct fdt_usb *config,
                udelay(1);
        }
        if (!loop_count)
-               return -1;
+               return -ETIMEDOUT;
 
        /* Disable ICUSB FS/LS transceiver */
        clrbits_le32(&usbctlr->icusb_ctrl, IC_ENB1);
@@ -567,6 +568,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
        int loop_count;
        struct ulpi_viewport ulpi_vp;
        struct usb_ctlr *usbctlr = config->reg;
+       int ret;
 
        /* set up ULPI reference clock on pllp_out4 */
        clock_enable(PERIPH_ID_DEV2_OUT);
@@ -612,9 +614,10 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
        ulpi_vp.port_num = 0;
        ulpi_vp.viewport_addr = (u32)&usbctlr->ulpi_viewport;
 
-       if (ulpi_init(&ulpi_vp)) {
+       ret = ulpi_init(&ulpi_vp);
+       if (ret) {
                printf("Tegra ULPI viewport init failed\n");
-               return -1;
+               return ret;
        }
 
        ulpi_set_vbus(&ulpi_vp, 1, 1);
@@ -631,7 +634,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
                udelay(1);
        }
        if (!loop_count)
-               return -1;
+               return -ETIMEDOUT;
        clrbits_le32(&usbctlr->susp_ctrl, USB_SUSP_CLR);
 
        return 0;
@@ -642,7 +645,7 @@ static int init_ulpi_usb_controller(struct fdt_usb *config,
 {
        printf("No code to set up ULPI controller, please enable"
                        "CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT");
-       return -1;
+       return -ENOSYS;
 }
 #endif
 
@@ -669,7 +672,7 @@ static int fdt_decode_usb(const void *blob, int node, struct fdt_usb *config)
                else {
                        debug("%s: Cannot decode dr_mode '%s'\n", __func__,
                              mode);
-                       return -FDT_ERR_NOTFOUND;
+                       return -EINVAL;
                }
        } else {
                config->dr_mode = DR_MODE_HOST;
@@ -684,7 +687,7 @@ static int fdt_decode_usb(const void *blob, int node, struct fdt_usb *config)
        config->periph_id = clock_decode_periph_id(blob, node);
        if (config->periph_id == PERIPH_ID_NONE) {
                debug("%s: Missing/invalid peripheral ID\n", __func__);
-               return -FDT_ERR_NOTFOUND;
+               return -EINVAL;
        }
        gpio_request_by_name_nodev(blob, node, "nvidia,vbus-gpio", 0,
                                   &config->vbus_gpio, GPIOD_IS_OUT);