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-rw-r--r--drivers/mfd/ocelot.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/mfd/ocelot.h b/drivers/mfd/ocelot.h
new file mode 100644
index 000000000..b8bc2f148
--- /dev/null
+++ b/drivers/mfd/ocelot.h
@@ -0,0 +1,49 @@
+/* SPDX-License-Identifier: GPL-2.0 OR MIT */
+/* Copyright 2021, 2022 Innovative Advantage Inc. */
+
+#ifndef _MFD_OCELOT_H
+#define _MFD_OCELOT_H
+
+#include <linux/kconfig.h>
+
+struct device;
+struct regmap;
+struct resource;
+
+/**
+ * struct ocelot_ddata - Private data for an external Ocelot chip
+ * @gcb_regmap: General Configuration Block regmap. Used for
+ * operations like chip reset.
+ * @cpuorg_regmap: CPU Device Origin Block regmap. Used for operations
+ * like SPI bus configuration.
+ * @spi_padding_bytes: Number of padding bytes that must be thrown out before
+ * read data gets returned. This is calculated during
+ * initialization based on bus speed.
+ * @dummy_buf: Zero-filled buffer of spi_padding_bytes size. The dummy
+ * bytes that will be sent out between the address and
+ * data of a SPI read operation.
+ */
+struct ocelot_ddata {
+ struct regmap *gcb_regmap;
+ struct regmap *cpuorg_regmap;
+ int spi_padding_bytes;
+ void *dummy_buf;
+};
+
+int ocelot_chip_reset(struct device *dev);
+int ocelot_core_init(struct device *dev);
+
+/* SPI-specific routines that won't be necessary for other interfaces */
+struct regmap *ocelot_spi_init_regmap(struct device *dev,
+ const struct resource *res);
+
+#define OCELOT_SPI_BYTE_ORDER_LE 0x00000000
+#define OCELOT_SPI_BYTE_ORDER_BE 0x81818181
+
+#ifdef __LITTLE_ENDIAN
+#define OCELOT_SPI_BYTE_ORDER OCELOT_SPI_BYTE_ORDER_LE
+#else
+#define OCELOT_SPI_BYTE_ORDER OCELOT_SPI_BYTE_ORDER_BE
+#endif
+
+#endif