drivers: i2c: litex: use frequency from device tree
use the clock frequency from the device tree. Signed-off-by: Fin Maaß <f.maass@vogl-electronic.com>
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3 changed files with 21 additions and 1 deletions
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@ -8,6 +8,11 @@
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#include <zephyr/device.h>
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#include <zephyr/drivers/i2c.h>
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#include <zephyr/logging/log.h>
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LOG_MODULE_REGISTER(i2c_litex, CONFIG_I2C_LOG_LEVEL);
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#include "i2c-priv.h"
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#include "i2c_bitbang.h"
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#include <soc.h>
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@ -25,6 +30,7 @@
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struct i2c_litex_cfg {
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uint32_t write_addr;
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uint32_t read_addr;
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uint32_t bitrate;
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};
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#define GET_I2C_CFG(dev) \
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@ -87,11 +93,18 @@ static int i2c_litex_init(const struct device *dev)
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{
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const struct i2c_litex_cfg *config = GET_I2C_CFG(dev);
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struct i2c_bitbang *bitbang = GET_I2C_BITBANG(dev);
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int ret;
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litex_write8(litex_read8(config->write_addr) | HIGH_STATE_ON_I2C_LINES, config->write_addr);
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i2c_bitbang_init(bitbang, &i2c_litex_bitbang_io, (void *)config);
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return 0;
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ret = i2c_bitbang_configure(bitbang,
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I2C_MODE_CONTROLLER | i2c_map_dt_bitrate(config->bitrate));
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if (ret != 0) {
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LOG_ERR("failed to configure I2C bitbang: %d", ret);
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}
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return ret;
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}
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static int i2c_litex_configure(const struct device *dev, uint32_t dev_config)
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@ -120,6 +133,7 @@ static const struct i2c_driver_api i2c_litex_driver_api = {
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static const struct i2c_litex_cfg i2c_litex_cfg_##n = { \
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.write_addr = DT_INST_REG_ADDR_BY_NAME(n, write), \
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.read_addr = DT_INST_REG_ADDR_BY_NAME(n, read), \
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.bitrate = DT_INST_PROP(n, clock_frequency), \
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}; \
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\
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static struct i2c_bitbang i2c_bitbang_##n; \
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@ -13,3 +13,6 @@ include: i2c-controller.yaml
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properties:
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reg:
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required: true
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clock-frequency:
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required: true
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@ -4,6 +4,8 @@
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/dt-bindings/i2c/i2c.h>
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/ {
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#address-cells = <1>;
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#size-cells = <1>;
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@ -161,6 +163,7 @@
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compatible = "litex,i2c";
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reg = <0xe0005000 0x4 0xe0005004 0x4>;
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reg-names = "write", "read";
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clock-frequency = <I2C_BITRATE_STANDARD>;
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#address-cells = <1>;
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#size-cells = <0>;
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status = "disabled";
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