/*
* Simple MFD - I2C
*
+ * Author(s):
+ * Michael Walle <michael@walle.cc>
+ * Lee Jones <lee.jones@linaro.org>
+ *
* This driver creates a single register map with the intention for it to be
* shared by all sub-devices. Children can use their parent's device structure
* (dev.parent) in order to reference it.
*
* Once the register map has been successfully initialised, any sub-devices
- * represented by child nodes in Device Tree will be subsequently registered.
+ * represented by child nodes in Device Tree or via the MFD cells in this file
+ * will be subsequently registered.
*/
#include <linux/i2c.h>
#include <linux/kernel.h>
+#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
-static const struct regmap_config simple_regmap_config = {
+#include "simple-mfd-i2c.h"
+
+static const struct regmap_config regmap_config_8r_8v = {
.reg_bits = 8,
.val_bits = 8,
};
static int simple_mfd_i2c_probe(struct i2c_client *i2c)
{
- const struct regmap_config *config;
+ const struct simple_mfd_data *simple_mfd_data;
+ const struct regmap_config *regmap_config;
struct regmap *regmap;
+ int ret;
+
+ simple_mfd_data = device_get_match_data(&i2c->dev);
- config = device_get_match_data(&i2c->dev);
- if (!config)
- config = &simple_regmap_config;
+ /* If no regmap_config is specified, use the default 8reg and 8val bits */
+ if (!simple_mfd_data || !simple_mfd_data->regmap_config)
+ regmap_config = ®map_config_8r_8v;
+ else
+ regmap_config = simple_mfd_data->regmap_config;
- regmap = devm_regmap_init_i2c(i2c, config);
+ regmap = devm_regmap_init_i2c(i2c, regmap_config);
if (IS_ERR(regmap))
return PTR_ERR(regmap);
- return devm_of_platform_populate(&i2c->dev);
+ /* If no MFD cells are spedified, use register the DT child nodes instead */
+ if (!simple_mfd_data || !simple_mfd_data->mfd_cell)
+ return devm_of_platform_populate(&i2c->dev);
+
+ ret = devm_mfd_add_devices(&i2c->dev, PLATFORM_DEVID_AUTO,
+ simple_mfd_data->mfd_cell,
+ simple_mfd_data->mfd_cell_size,
+ NULL, 0, NULL);
+ if (ret)
+ dev_err(&i2c->dev, "Failed to add child devices\n");
+
+ return ret;
}
static const struct of_device_id simple_mfd_i2c_of_match[] = {
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Simple MFD - I2C
+ *
+ * Author: Lee Jones <lee.jones@linaro.org>
+ *
+ * This driver creates a single register map with the intention for it to be
+ * shared by all sub-devices. Children can use their parent's device structure
+ * (dev.parent) in order to reference it.
+ *
+ * This driver creates a single register map with the intention for it to be
+ * shared by all sub-devices. Children can use their parent's device structure
+ * (dev.parent) in order to reference it.
+ *
+ * Once the register map has been successfully initialised, any sub-devices
+ * represented by child nodes in Device Tree or via the MFD cells in the
+ * associated C file will be subsequently registered.
+ */
+
+#ifndef __MFD_SIMPLE_MFD_I2C_H
+#define __MFD_SIMPLE_MFD_I2C_H
+
+#include <linux/mfd/core.h>
+#include <linux/regmap.h>
+
+struct simple_mfd_data {
+ const struct regmap_config *regmap_config;
+ const struct mfd_cell *mfd_cell;
+ size_t mfd_cell_size;
+};
+
+#endif /* __MFD_SIMPLE_MFD_I2C_H */