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drivers: i2c: add pinctrl support to Arm sbcon driver

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Adds necessary pinctrl support to Arm SBCon I2C driver.

Signed-off-by: Samuel Chee <samche01@arm.com>
Signed-off-by: Sudan Landge <sudan.landge@arm.com>
This commit is contained in:
Samuel Chee 2025-02-05 13:44:19 +00:00 • committed by Benjamin Cabé
commit 4772e183dc
3 changed files with 29 additions and 18 deletions
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1
drivers/i2c/Kconfig.sbcon
View file

@ -6,3 +6,4 @@ config I2C_SBCON
default y
depends on DT_HAS_ARM_VERSATILE_I2C_ENABLED
select I2C_BITBANG
select PINCTRL

43
drivers/i2c/i2c_sbcon.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2017 Linaro Ltd.
* Copyright 2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -17,7 +18,7 @@
#include <zephyr/device.h>
#include <errno.h>
#include <zephyr/drivers/i2c.h>
#include <zephyr/drivers/pinctrl.h>
#include <zephyr/logging/log.h>
LOG_MODULE_REGISTER(i2c_sbcon, CONFIG_I2C_LOG_LEVEL);
@ -41,6 +42,7 @@ struct sbcon {
struct i2c_sbcon_config {
struct sbcon *sbcon; /* Address of hardware registers */
uint32_t bitrate; /* I2C bus speed in Hz */
const struct pinctrl_dev_config *pctrl;
};
/* Driver instance data */
@ -128,7 +130,14 @@ static int i2c_sbcon_init(const struct device *dev)
struct i2c_sbcon_context *context = dev->data;
const struct i2c_sbcon_config *config = dev->config;
int ret;
ret = pinctrl_apply_state(config->pctrl, PINCTRL_STATE_DEFAULT);
/* some pins are not available externally so,
* ignore if there is no entry for them
*/
if (ret != -ENOENT) {
return ret;
}
i2c_bitbang_init(&context->bitbang, &io_fns, config->sbcon);
ret = i2c_bitbang_configure(&context->bitbang,
@ -136,24 +145,24 @@ static int i2c_sbcon_init(const struct device *dev)
if (ret != 0) {
LOG_ERR("failed to configure I2C bitbang: %d", ret);
}
return ret;
}
#define DEFINE_I2C_SBCON(_num) \
\
static struct i2c_sbcon_context i2c_sbcon_dev_data_##_num; \
\
static const struct i2c_sbcon_config i2c_sbcon_dev_cfg_##_num = { \
.sbcon = (void *)DT_INST_REG_ADDR(_num), \
.bitrate = DT_INST_PROP(_num, clock_frequency), \
}; \
\
I2C_DEVICE_DT_INST_DEFINE(_num, \
i2c_sbcon_init, \
NULL, \
&i2c_sbcon_dev_data_##_num, \
&i2c_sbcon_dev_cfg_##_num, \
PRE_KERNEL_2, CONFIG_I2C_INIT_PRIORITY, &api);
#define DEFINE_I2C_SBCON(_num) \
PINCTRL_DT_INST_DEFINE(_num); \
static struct i2c_sbcon_context i2c_sbcon_dev_data_##_num; \
\
static const struct i2c_sbcon_config i2c_sbcon_dev_cfg_##_num = { \
.sbcon = (void *)DT_INST_REG_ADDR(_num), \
.bitrate = DT_INST_PROP(_num, clock_frequency), \
.pctrl = PINCTRL_DT_INST_DEV_CONFIG_GET(_num), \
}; \
\
I2C_DEVICE_DT_INST_DEFINE(_num, \
i2c_sbcon_init, \
NULL, \
&i2c_sbcon_dev_data_##_num, \
&i2c_sbcon_dev_cfg_##_num, \
PRE_KERNEL_2, CONFIG_I2C_INIT_PRIORITY, &api);
DT_INST_FOREACH_STATUS_OKAY(DEFINE_I2C_SBCON)

3
dts/bindings/i2c/arm,versatile-i2c.yaml
View file

@ -1,11 +1,12 @@
# Copyright (c) 2018, Linaro Limited
# Copyright 2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
# SPDX-License-Identifier: Apache-2.0
description: ARM SBCon two-wire serial bus interface
compatible: "arm,versatile-i2c"
include: i2c-controller.yaml
include: [i2c-controller.yaml, pinctrl-device.yaml]
properties:
reg: