SPI挂载设备时，如果总线设备为空则赋值

Author: Rbb666

components/drivers/spi/dev_spi_core.c

@@ -64,7 +64,7 @@ rt_err_t rt_spi_bus_register(struct rt_spi_bus       *bus,
             for (int i = 0; i < pin_count; ++i)
             {
                 bus->pins[i] = rt_pin_get_named_pin(&bus->parent, "cs", i,
-                        RT_NULL, RT_NULL);
+                                                    RT_NULL, RT_NULL);
             }
         }
         else if (pin_count == 0)
@@ -103,12 +103,15 @@ rt_err_t rt_spi_bus_attach_device_cspin(struct rt_spi_device *device,
     {
         device->bus = (struct rt_spi_bus *)bus;
 
+        if (device->bus->owner == RT_NULL)
+            device->bus->owner = device;
+
         /* initialize spidev device */
         result = rt_spidev_device_init(device, name);
         if (result != RT_EOK)
             return result;
 
-        if(cs_pin != PIN_NONE)
+        if (cs_pin != PIN_NONE)
         {
             rt_pin_mode(cs_pin, PIN_MODE_OUTPUT);
         }
@@ -150,17 +153,16 @@ rt_err_t rt_spi_bus_configure(struct rt_spi_device *device)
                     LOG_E("SPI device %s configuration failed", device->parent.parent.name);
                 }
             }
-
+            else
+            {
+                /* RT_EBUSY is not an error condition and
+                 * the configuration will take effect once the device has the bus
+                 */
+                result = -RT_EBUSY;
+            }
             /* release lock */
             rt_mutex_release(&(device->bus->lock));
         }
-        else
-        {
-            /* RT_EBUSY is not an error condition and
-             * the configuration will take effect once the device has the bus
-             */
-            result = -RT_EBUSY;
-        }
     }
     else
     {
@@ -451,7 +453,7 @@ rt_err_t rt_spi_sendrecv16(struct rt_spi_device *device,
     }
 
     len = rt_spi_transfer(device, &senddata, recvdata, 2);
-    if(len < 0)
+    if (len < 0)
     {
         return (rt_err_t)len;
     }
@@ -578,7 +580,7 @@ rt_err_t rt_spi_take(struct rt_spi_device *device)
     message.cs_take = 1;
 
     result = device->bus->ops->xfer(device, &message);
-    if(result < 0)
+    if (result < 0)
     {
         return (rt_err_t)result;
     }
@@ -598,7 +600,7 @@ rt_err_t rt_spi_release(struct rt_spi_device *device)
     message.cs_release = 1;
 
     result = device->bus->ops->xfer(device, &message);
-    if(result < 0)
+    if (result < 0)
     {
         return (rt_err_t)result;
     }