usb: renesas_usbhs: add the channel number in dma-names

To connect the channel of USB-DMAC to USBHS DnFIFO number, this patch
adds this channel/FIFO number in dma-names. Otherwise, this driver
needs to add analysis code for device tree.

Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

2 files changed, 17 insertions, 8 deletions

diff --git a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
index 61b045b6d50e..dc2a18f0b3a1 100644
--- a/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
+++ b/Documentation/devicetree/bindings/usb/renesas_usbhs.txt
@@ -15,7 +15,10 @@ Optional properties:
   - phys: phandle + phy specifier pair
   - phy-names: must be "usb"
   - dmas: Must contain a list of references to DMA specifiers.
-  - dma-names : Must contain a list of DMA names, "tx" or "rx".
+  - dma-names : Must contain a list of DMA names:
+   - tx0 ... tx<n>
+   - rx0 ... rx<n>
+    - This <n> means DnFIFO in USBHS module.
 
 Example:
         usbhs: usb@e6590000 {
diff --git a/drivers/usb/renesas_usbhs/fifo.c b/drivers/usb/renesas_usbhs/fifo.c
index d891bff39d66..28d10eb432d5 100644
--- a/drivers/usb/renesas_usbhs/fifo.c
+++ b/drivers/usb/renesas_usbhs/fifo.c
@@ -1069,23 +1069,29 @@ static void usbhsf_dma_init_pdev(struct usbhs_fifo *fifo)
                                             &fifo->rx_slave);
 }
 
-static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo)
+static void usbhsf_dma_init_dt(struct device *dev, struct usbhs_fifo *fifo,
+                               int channel)
 {
-        fifo->tx_chan = dma_request_slave_channel_reason(dev, "tx");
+        char name[16];
+
+        snprintf(name, sizeof(name), "tx%d", channel);
+        fifo->tx_chan = dma_request_slave_channel_reason(dev, name);
         if (IS_ERR(fifo->tx_chan))
                 fifo->tx_chan = NULL;
-        fifo->rx_chan = dma_request_slave_channel_reason(dev, "rx");
+
+        snprintf(name, sizeof(name), "rx%d", channel);
+        fifo->rx_chan = dma_request_slave_channel_reason(dev, name);
         if (IS_ERR(fifo->rx_chan))
                 fifo->rx_chan = NULL;
 }
 
-static void usbhsf_dma_init(struct usbhs_priv *priv,
-                            struct usbhs_fifo *fifo)
+static void usbhsf_dma_init(struct usbhs_priv *priv, struct usbhs_fifo *fifo,
+                            int channel)
 {
         struct device *dev = usbhs_priv_to_dev(priv);
 
         if (dev->of_node)
-                usbhsf_dma_init_dt(dev, fifo);
+                usbhsf_dma_init_dt(dev, fifo, channel);
         else
                 usbhsf_dma_init_pdev(fifo);
 
@@ -1231,7 +1237,7 @@ do {									\
                         usbhs_get_dparam(priv, d##channel##_tx_id);     \
         fifo->rx_slave.shdma_slave.slave_id =                           \
                         usbhs_get_dparam(priv, d##channel##_rx_id);     \
-        usbhsf_dma_init(priv, fifo);                                    \
+        usbhsf_dma_init(priv, fifo, channel);                           \
 } while (0)
 
 #define USBHS_DFIFO_INIT(priv, fifo, channel)                           \