1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Copyright (c) 2015 Google, Inc
4 * Written by Simon Glass <sjg@chromium.org>
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <cros_ec.h>
10 #include <errno.h>
11 #include <i2c.h>
12 #include <asm/global_data.h>
13
14 DECLARE_GLOBAL_DATA_PTR;
15
16 struct cros_ec_i2c_bus {
17 int remote_bus;
18 };
19
cros_ec_i2c_set_bus_speed(struct udevice * dev,unsigned int speed)20 static int cros_ec_i2c_set_bus_speed(struct udevice *dev, unsigned int speed)
21 {
22 return 0;
23 }
24
cros_ec_i2c_xfer(struct udevice * dev,struct i2c_msg * msg,int nmsgs)25 static int cros_ec_i2c_xfer(struct udevice *dev, struct i2c_msg *msg,
26 int nmsgs)
27 {
28 struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
29
30 return cros_ec_i2c_tunnel(dev->parent, i2c_bus->remote_bus, msg, nmsgs);
31 }
32
cros_ec_i2c_of_to_plat(struct udevice * dev)33 static int cros_ec_i2c_of_to_plat(struct udevice *dev)
34 {
35 struct cros_ec_i2c_bus *i2c_bus = dev_get_priv(dev);
36 const void *blob = gd->fdt_blob;
37 int node = dev_of_offset(dev);
38
39 i2c_bus->remote_bus = fdtdec_get_uint(blob, node, "google,remote-bus",
40 0);
41
42 return 0;
43 }
44
45 static const struct dm_i2c_ops cros_ec_i2c_ops = {
46 .xfer = cros_ec_i2c_xfer,
47 .set_bus_speed = cros_ec_i2c_set_bus_speed,
48 };
49
50 static const struct udevice_id cros_ec_i2c_ids[] = {
51 { .compatible = "google,cros-ec-i2c-tunnel" },
52 { }
53 };
54
55 U_BOOT_DRIVER(cros_ec_tunnel) = {
56 .name = "cros_ec_tunnel",
57 .id = UCLASS_I2C,
58 .of_match = cros_ec_i2c_ids,
59 .of_to_plat = cros_ec_i2c_of_to_plat,
60 .priv_auto = sizeof(struct cros_ec_i2c_bus),
61 .ops = &cros_ec_i2c_ops,
62 };
63