1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2012 Samsung Electronics
4  * Abhilash Kesavan <a.kesavan@samsung.com>
5  */
6 
7 #ifndef __ASM_ARM_ARCH_PINMUX_H
8 #define __ASM_ARM_ARCH_PINMUX_H
9 
10 #include "periph.h"
11 
12 /*
13  * Flags for setting specific configarations of peripherals.
14  * List will grow with support for more devices getting added.
15  */
16 enum {
17 	PINMUX_FLAG_NONE	= 0x00000000,
18 
19 	/* Flags for eMMC */
20 	PINMUX_FLAG_8BIT_MODE	= 1 << 0,       /* SDMMC 8-bit mode */
21 
22 	/* Flags for SROM controller */
23 	PINMUX_FLAG_BANK	= 3 << 0,       /* bank number (0-3) */
24 	PINMUX_FLAG_16BIT	= 1 << 2,       /* 16-bit width */
25 
26 	/* Flags for I2C */
27 	PINMUX_FLAG_HS_MODE	= 1 << 1,       /* I2C High Speed Mode */
28 };
29 
30 /**
31  * Configures the pinmux for a particular peripheral.
32  *
33  * Each gpio can be configured in many different ways (4 bits on exynos)
34  * such as "input", "output", "special function", "external interrupt"
35  * etc. This function will configure the peripheral pinmux along with
36  * pull-up/down and drive strength.
37  *
38  * @param peripheral	peripheral to be configured
39  * @param flags		configure flags
40  * @return 0 if ok, -1 on error (e.g. unsupported peripheral)
41  */
42 int exynos_pinmux_config(int peripheral, int flags);
43 
44 /**
45  * Decode the peripheral id using the interrpt numbers.
46  *
47  * @param blob  Device tree blob
48  * @param node  FDT I2C node to find
49  * @return peripheral id if ok, PERIPH_ID_NONE on error
50  */
51 int pinmux_decode_periph_id(const void *blob, int node);
52 #endif
53