include/linux/platform_data/spi-s3c64xx.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2
   3 /*
   4  * Copyright (C) 2009 Samsung Electronics Ltd.
   5  *      Jaswinder Singh <jassi.brar@samsung.com>
   6  */
   7
   8 #ifndef __SPI_S3C64XX_H
   9 #define __SPI_S3C64XX_H
  10
  11 #include <linux/dmaengine.h>
  12
  13 struct platform_device;
  14
  15 /**
  16  * struct s3c64xx_spi_csinfo - ChipSelect description
  17  * @fb_delay: Slave specific feedback delay.
  18  *            Refer to FB_CLK_SEL register definition in SPI chapter.
  19  *
  20  * This is per SPI-Slave Chipselect information.
  21  * Allocate and initialize one in machine init code and make the
  22  * spi_board_info.controller_data point to it.
  23  */
  24 struct s3c64xx_spi_csinfo {
  25         u8 fb_delay;
  26 };
  27
  28 /**
  29  * struct s3c64xx_spi_info - SPI Controller defining structure
  30  * @src_clk_nr: Clock source index for the CLK_CFG[SPI_CLKSEL] field.
  31  * @num_cs: Number of CS this controller emulates.
  32  * @no_cs: Used when CS line is not connected.
  33  * @cfg_gpio: Configure pins for this SPI controller.
  34  */
  35 struct s3c64xx_spi_info {
  36         int src_clk_nr;
  37         int num_cs;
  38         bool no_cs;
  39         bool polling;
  40         int (*cfg_gpio)(void);
  41 };
  42
  43 /**
  44  * s3c64xx_spi_set_platdata - SPI Controller configure callback by the board
  45  *                              initialization code.
  46  * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
  47  * @num_cs: Number of elements in the 'cs' array.
  48  *
  49  * Call this from machine init code for each SPI Controller that
  50  * has some chips attached to it.
  51  */
  52 extern void s3c64xx_spi0_set_platdata(int src_clk_nr, int num_cs);
  53
  54 /* defined by architecture to configure gpio */
  55 extern int s3c64xx_spi0_cfg_gpio(void);
  56
  57 extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
  58 #endif /*__SPI_S3C64XX_H */