drivers/mfd/ocelot.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR MIT */
   2 /* Copyright 2021, 2022 Innovative Advantage Inc. */
   3
   4 #ifndef _MFD_OCELOT_H
   5 #define _MFD_OCELOT_H
   6
   7 #include <linux/kconfig.h>
   8
   9 struct device;
  10 struct regmap;
  11 struct resource;
  12
  13 /**
  14  * struct ocelot_ddata - Private data for an external Ocelot chip
  15  * @gcb_regmap:         General Configuration Block regmap. Used for
  16  *                      operations like chip reset.
  17  * @cpuorg_regmap:      CPU Device Origin Block regmap. Used for operations
  18  *                      like SPI bus configuration.
  19  * @spi_padding_bytes:  Number of padding bytes that must be thrown out before
  20  *                      read data gets returned. This is calculated during
  21  *                      initialization based on bus speed.
  22  * @dummy_buf:          Zero-filled buffer of spi_padding_bytes size. The dummy
  23  *                      bytes that will be sent out between the address and
  24  *                      data of a SPI read operation.
  25  */
  26 struct ocelot_ddata {
  27         struct regmap *gcb_regmap;
  28         struct regmap *cpuorg_regmap;
  29         int spi_padding_bytes;
  30         void *dummy_buf;
  31 };
  32
  33 int ocelot_chip_reset(struct device *dev);
  34 int ocelot_core_init(struct device *dev);
  35
  36 /* SPI-specific routines that won't be necessary for other interfaces */
  37 struct regmap *ocelot_spi_init_regmap(struct device *dev,
  38                                       const struct resource *res);
  39
  40 #define OCELOT_SPI_BYTE_ORDER_LE 0x00000000
  41 #define OCELOT_SPI_BYTE_ORDER_BE 0x81818181
  42
  43 #ifdef __LITTLE_ENDIAN
  44 #define OCELOT_SPI_BYTE_ORDER OCELOT_SPI_BYTE_ORDER_LE
  45 #else
  46 #define OCELOT_SPI_BYTE_ORDER OCELOT_SPI_BYTE_ORDER_BE
  47 #endif
  48
  49 #endif