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https://github.com/brain-hackers/u-boot-brain
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71204e95ce
1. Introduce a new structure `struct mxc_i2c_bus`, this structure will
used for non-DM and DM.
2. Remove `struct mxc_i2c_regs` structure, but use register offset to access
registers based on `base` entry of `struct mxc_i2c_bus`.
3. Remove most `#ifdef I2C_QUIRK_REG`. Using driver_data to contain platform
flags. A new flag is introduced, I2C_QUIRK_FLAG.
4. Most functions use `struct mxc_i2c_bus` as one of the parameters.
Make most functions common to DM and non-DM, try to avoid duplicated code.
5. Support DM, but pinctrl is not included. Pinmux setting is still set
by setup_i2c, but we do not need bus_i2c_init for DM.
6. struct i2c_parms and struct sram_data are removed.
7. Remove bus_i2c_read bus_i2c_write prototype in header file. The frist
paramter of bus_i2c_init is modified to i2c index. Add new prototype
i2c_idle_bus and force_bus_idle. Since bus_i2c_init is not good for
DM I2C and pinctrl is missed, we use a weak function for i2c_idle_bus.
Board file take the responsibility to implement this function, like this:
"
int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus)
{
if (i2c_bus->index == 0)
force_bus_idle(i2c_pads_info0);
else if (i2c_bus->index == 1)
force_bus_idle(i2c_pads_info1);
else
xxxxxx
}
"
8. Introduce a weak function, enable_i2c_clk
9. Tested on an i.MX7 platform. Log info:
=> dm tree
Class Probed Name
----------------------------------------
root [ + ] root_driver
simple_bus [ ] |-- soc
simple_bus [ ] | |-- aips-bus@30000000
simple_bus [ ] | | |-- anatop@30360000
simple_bus [ ] | | `-- snvs@30370000
simple_bus [ ] | |-- aips-bus@30400000
simple_bus [ ] | `-- aips-bus@30800000
i2c [ ] | |-- i2c@30a20000
i2c [ ] | `-- i2c@30a40000
simple_bus [ ] `-- regulators
=> i2c dev 0
Setting bus to 0
=> i2c probe
Valid chip addresses: 08 50
=> i2c md 8 31
0031: 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08 08
Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Acked-by: Simon Glass <sjg@chromium.org>
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/*
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* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __ASM_ARCH_MXC_MXC_I2C_H__
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#define __ASM_ARCH_MXC_MXC_I2C_H__
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#include <asm/imx-common/iomux-v3.h>
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struct i2c_pin_ctrl {
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iomux_v3_cfg_t i2c_mode;
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iomux_v3_cfg_t gpio_mode;
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unsigned char gp;
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unsigned char spare;
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};
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struct i2c_pads_info {
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struct i2c_pin_ctrl scl;
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struct i2c_pin_ctrl sda;
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};
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/*
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* Information about i2c controller
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* struct mxc_i2c_bus - information about the i2c[x] bus
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* @index: i2c bus index
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* @base: Address of I2C bus controller
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* @driver_data: Flags for different platforms, such as I2C_QUIRK_FLAG.
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* @speed: Speed of I2C bus
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* @pads_info: pinctrl info for this i2c bus, will be used when pinctrl is ok.
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* The following two is only to be compatible with non-DM part.
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* @idle_bus_fn: function to force bus idle
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* @idle_bus_data: parameter for idle_bus_fun
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*/
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struct mxc_i2c_bus {
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/*
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* board file can use this index to locate which i2c_pads_info is for
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* i2c_idle_bus. When pinmux is implement, this entry can be
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* discarded. Here we do not use dev->seq, because we do not want to
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* export device to board file.
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*/
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int index;
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ulong base;
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ulong driver_data;
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int speed;
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struct i2c_pads_info *pads_info;
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#ifndef CONFIG_DM_I2C
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int (*idle_bus_fn)(void *p);
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void *idle_bus_data;
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#endif
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};
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#if defined(CONFIG_MX6QDL)
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#define I2C_PADS(name, scl_i2c, scl_gpio, scl_gp, sda_i2c, sda_gpio, sda_gp) \
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struct i2c_pads_info mx6q_##name = { \
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.scl = { \
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.i2c_mode = MX6Q_##scl_i2c, \
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.gpio_mode = MX6Q_##scl_gpio, \
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.gp = scl_gp, \
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}, \
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.sda = { \
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.i2c_mode = MX6Q_##sda_i2c, \
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.gpio_mode = MX6Q_##sda_gpio, \
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.gp = sda_gp, \
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} \
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}; \
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struct i2c_pads_info mx6s_##name = { \
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.scl = { \
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.i2c_mode = MX6DL_##scl_i2c, \
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.gpio_mode = MX6DL_##scl_gpio, \
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.gp = scl_gp, \
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}, \
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.sda = { \
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.i2c_mode = MX6DL_##sda_i2c, \
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.gpio_mode = MX6DL_##sda_gpio, \
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.gp = sda_gp, \
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} \
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};
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#define I2C_PADS_INFO(name) \
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(is_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) ? \
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&mx6q_##name : &mx6s_##name
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#endif
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int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
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struct i2c_pads_info *p);
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void bus_i2c_init(int index, int speed, int slave_addr,
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int (*idle_bus_fn)(void *p), void *p);
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int force_idle_bus(void *priv);
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int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus);
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#endif
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