tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
13struct 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 * @line: Custom 'identity' of the CS line.
20 *
21 * This is per SPI-Slave Chipselect information.
22 * Allocate and initialize one in machine init code and make the
23 * spi_board_info.controller_data point to it.
24 */
25struct s3c64xx_spi_csinfo {
26 u8 fb_delay;
27 unsigned line;
28};
29
30/**
31 * struct s3c64xx_spi_info - SPI Controller defining structure
32 * @src_clk_nr: Clock source index for the CLK_CFG[SPI_CLKSEL] field.
33 * @num_cs: Number of CS this controller emulates.
34 * @cfg_gpio: Configure pins for this SPI controller.
35 */
36struct s3c64xx_spi_info {
37 int src_clk_nr;
38 int num_cs;
39 bool no_cs;
40 int (*cfg_gpio)(void);
41};
42
43/**
44 * s3c64xx_spi_set_platdata - SPI Controller configure callback by the board
45 * initialization code.
46 * @cfg_gpio: Pointer to gpio setup function.
47 * @src_clk_nr: Clock the SPI controller is to use to generate SPI clocks.
48 * @num_cs: Number of elements in the 'cs' array.
49 *
50 * Call this from machine init code for each SPI Controller that
51 * has some chips attached to it.
52 */
53extern void s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
54 int num_cs);
55extern void s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
56 int num_cs);
57extern void s3c64xx_spi2_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
58 int num_cs);
59
60/* defined by architecture to configure gpio */
61extern int s3c64xx_spi0_cfg_gpio(void);
62extern int s3c64xx_spi1_cfg_gpio(void);
63extern int s3c64xx_spi2_cfg_gpio(void);
64
65extern struct s3c64xx_spi_info s3c64xx_spi0_pdata;
66extern struct s3c64xx_spi_info s3c64xx_spi1_pdata;
67extern struct s3c64xx_spi_info s3c64xx_spi2_pdata;
68#endif /*__SPI_S3C64XX_H */