usb: musb: cppi41: allow to defer probing if DMA isn't yet available

[karo-tx-linux.git] / drivers / usb / musb / musb_cppi41.c

diff --git a/drivers/usb/musb/musb_cppi41.c b/drivers/usb/musb/musb_cppi41.c
index ae959746f77f04331a1d8dde9d1da57d90af24b8..ff9d6de2b7465c949d54ae4801108a3800f4be3f 100644 (file)
--- a/drivers/usb/musb/musb_cppi41.c
+++ b/drivers/usb/musb/musb_cppi41.c
@@ -484,6 +484,7 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
                if (ret)
                        goto err;
 
+               ret = -EINVAL;
                if (port > MUSB_DMA_NUM_CHANNELS || !port)
                        goto err;
                if (is_tx)
@@ -503,6 +504,7 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
                dc = dma_request_slave_channel(dev, str);
                if (!dc) {
                        dev_err(dev, "Falied to request %s.\n", str);
+                       ret = -EPROBE_DEFER;
                        goto err;
                }
                cppi41_channel->dc = dc;
@@ -510,7 +512,7 @@ static int cppi41_dma_controller_start(struct cppi41_dma_controller *controller)
        return 0;
 err:
        cppi41_release_all_dma_chans(controller);
-       return -EINVAL;
+       return ret;
 }
 
 void dma_controller_destroy(struct dma_controller *c)
@@ -526,7 +528,7 @@ struct dma_controller *dma_controller_create(struct musb *musb,
                                        void __iomem *base)
 {
        struct cppi41_dma_controller *controller;
-       int ret;
+       int ret = 0;
 
        if (!musb->controller->of_node) {
                dev_err(musb->controller, "Need DT for the DMA engine.\n");
@@ -553,5 +555,7 @@ struct dma_controller *dma_controller_create(struct musb *musb,
 plat_get_fail:
        kfree(controller);
 kzalloc_fail:
+       if (ret == -EPROBE_DEFER)
+               return ERR_PTR(ret);
        return NULL;
 }