1 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/spi/spi_gpio.h b/include/linux/spi/spi_gpio.h
new file mode 100644
index 000000000..9e7e83d86
--- /dev/null
+++ b/include/linux/spi/spi_gpio.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_SPI_GPIO_H
+#define __LINUX_SPI_GPIO_H
+
+/*
+ * For each bitbanged SPI bus, set up a platform_device node with:
+ *   - name "spi_gpio"
+ *   - id the same as the SPI bus number it implements
+ *   - dev.platform data pointing to a struct spi_gpio_platform_data
+ *
+ * Use spi_board_info with these busses in the usual way.
+ *
+ * If the bitbanged bus is later switched to a "native" controller,
+ * that platform_device and controller_data should be removed.
+ */
+
+/**
+ * struct spi_gpio_platform_data - parameter for bitbanged SPI master
+ * @num_chipselect: how many slaves to allow
+ */
+struct spi_gpio_platform_data {
+	u16		num_chipselect;
+};
+
+#endif /* __LINUX_SPI_GPIO_H */