[spi]添加rt_spi_bus_attach_device_cspin 函数 (#6916)

这个函数实现了原先的挂载功能，并且调用pin框架，初始化cs引脚，是一个功能相对完善的挂载函数。用户也能更简单的使用。
该函数取代rt_spi_bus_attach_device，后续rt_spi_bus_attach_device会被逐渐淘汰掉。新的BSP以及软件包应当使用rt_spi_bus_attach_device_cspin新函数。

STM32L475潘多拉测试通过。

1 files changed, 7 insertions, 0 deletions

diff --git a/components/drivers/include/drivers/spi.h b/components/drivers/include/drivers/spi.h
index cd5ebe2db6..7e3842d76e 100644
--- a/components/drivers/include/drivers/spi.h
+++ b/components/drivers/include/drivers/spi.h
@@ -177,6 +177,13 @@ rt_err_t rt_spi_bus_attach_device(struct rt_spi_device *device,
                                   const char           *bus_name,
                                   void                 *user_data);
 
+/* attach a device on SPI bus with CS pin */
+rt_err_t rt_spi_bus_attach_device_cspin(struct rt_spi_device *device,
+                                        const char           *name,
+                                        const char           *bus_name,
+                                        rt_base_t            cs_pin,
+                                        void                 *user_data);
+
 /**
  * This function takes SPI bus.
  *