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drivers: i2c: litex: use frequency from device tree

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use the clock frequency from the device tree.

Signed-off-by: Fin Maaß <f.maass@vogl-electronic.com>
This commit is contained in:
Fin Maaß 2024-05-14 10:39:39 +02:00 • committed by Alberto Escolar
commit 2be9ed7103
3 changed files with 21 additions and 1 deletions
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16
drivers/i2c/i2c_litex.c
View file

@ -8,6 +8,11 @@
#include <zephyr/device.h> #include <zephyr/device.h>
#include <zephyr/drivers/i2c.h> #include <zephyr/drivers/i2c.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(i2c_litex, CONFIG_I2C_LOG_LEVEL);
#include "i2c-priv.h"
#include "i2c_bitbang.h" #include "i2c_bitbang.h"
#include <soc.h> #include <soc.h>
@ -25,6 +30,7 @@
struct i2c_litex_cfg { struct i2c_litex_cfg {
uint32_t write_addr; uint32_t write_addr;
uint32_t read_addr; uint32_t read_addr;
uint32_t bitrate;
}; };
#define GET_I2C_CFG(dev) \ #define GET_I2C_CFG(dev) \
@ -87,11 +93,18 @@ static int i2c_litex_init(const struct device *dev)
{ {
const struct i2c_litex_cfg *config = GET_I2C_CFG(dev); const struct i2c_litex_cfg *config = GET_I2C_CFG(dev);
struct i2c_bitbang *bitbang = GET_I2C_BITBANG(dev); struct i2c_bitbang *bitbang = GET_I2C_BITBANG(dev);
int ret;
litex_write8(litex_read8(config->write_addr) | HIGH_STATE_ON_I2C_LINES, config->write_addr); litex_write8(litex_read8(config->write_addr) | HIGH_STATE_ON_I2C_LINES, config->write_addr);
i2c_bitbang_init(bitbang, &i2c_litex_bitbang_io, (void *)config); i2c_bitbang_init(bitbang, &i2c_litex_bitbang_io, (void *)config);
return 0; ret = i2c_bitbang_configure(bitbang,
I2C_MODE_CONTROLLER | i2c_map_dt_bitrate(config->bitrate));
if (ret != 0) {
LOG_ERR("failed to configure I2C bitbang: %d", ret);
}
return ret;
} }
static int i2c_litex_configure(const struct device *dev, uint32_t dev_config) static int i2c_litex_configure(const struct device *dev, uint32_t dev_config)
@ -120,6 +133,7 @@ static const struct i2c_driver_api i2c_litex_driver_api = {
static const struct i2c_litex_cfg i2c_litex_cfg_##n = { \ static const struct i2c_litex_cfg i2c_litex_cfg_##n = { \
.write_addr = DT_INST_REG_ADDR_BY_NAME(n, write), \ .write_addr = DT_INST_REG_ADDR_BY_NAME(n, write), \
.read_addr = DT_INST_REG_ADDR_BY_NAME(n, read), \ .read_addr = DT_INST_REG_ADDR_BY_NAME(n, read), \
.bitrate = DT_INST_PROP(n, clock_frequency), \
}; \ }; \
\ \
static struct i2c_bitbang i2c_bitbang_##n; \ static struct i2c_bitbang i2c_bitbang_##n; \

3
dts/bindings/i2c/litex,i2c.yaml
View file

@ -13,3 +13,6 @@ include: i2c-controller.yaml
properties: properties:
reg: reg:
required: true required: true
clock-frequency:
required: true

3
dts/riscv/riscv32-litex-vexriscv.dtsi
View file

@ -4,6 +4,8 @@
* SPDX-License-Identifier: Apache-2.0 * SPDX-License-Identifier: Apache-2.0
*/ */
#include <zephyr/dt-bindings/i2c/i2c.h>
/ { / {
#address-cells = <1>; #address-cells = <1>;
#size-cells = <1>; #size-cells = <1>;
@ -161,6 +163,7 @@
compatible = "litex,i2c"; compatible = "litex,i2c";
reg = <0xe0005000 0x4 0xe0005004 0x4>; reg = <0xe0005000 0x4 0xe0005004 0x4>;
reg-names = "write", "read"; reg-names = "write", "read";
clock-frequency = <I2C_BITRATE_STANDARD>;
#address-cells = <1>; #address-cells = <1>;
#size-cells = <0>; #size-cells = <0>;
status = "disabled"; status = "disabled";