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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/mfd/simple-mfd-i2c.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/mfd/simple-mfd-i2c.c')
-rw-r--r--drivers/mfd/simple-mfd-i2c.c106
1 files changed, 106 insertions, 0 deletions
diff --git a/drivers/mfd/simple-mfd-i2c.c b/drivers/mfd/simple-mfd-i2c.c
new file mode 100644
index 0000000000..6eda795332
--- /dev/null
+++ b/drivers/mfd/simple-mfd-i2c.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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 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>
+
+#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 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);
+
+ /* If no regmap_config is specified, use the default 8reg and 8val bits */
+ if (!simple_mfd_data || !simple_mfd_data->regmap_config)
+ regmap_config = &regmap_config_8r_8v;
+ else
+ regmap_config = simple_mfd_data->regmap_config;
+
+ regmap = devm_regmap_init_i2c(i2c, regmap_config);
+ if (IS_ERR(regmap))
+ return PTR_ERR(regmap);
+
+ /* If no MFD cells are specified, register using 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 mfd_cell sy7636a_cells[] = {
+ { .name = "sy7636a-regulator", },
+ { .name = "sy7636a-temperature", },
+};
+
+static const struct simple_mfd_data silergy_sy7636a = {
+ .mfd_cell = sy7636a_cells,
+ .mfd_cell_size = ARRAY_SIZE(sy7636a_cells),
+};
+
+static const struct mfd_cell max5970_cells[] = {
+ { .name = "max5970-regulator", },
+ { .name = "max5970-iio", },
+ { .name = "max5970-led", },
+};
+
+static const struct simple_mfd_data maxim_max5970 = {
+ .mfd_cell = max5970_cells,
+ .mfd_cell_size = ARRAY_SIZE(max5970_cells),
+};
+
+static const struct of_device_id simple_mfd_i2c_of_match[] = {
+ { .compatible = "kontron,sl28cpld" },
+ { .compatible = "silergy,sy7636a", .data = &silergy_sy7636a},
+ { .compatible = "maxim,max5970", .data = &maxim_max5970},
+ { .compatible = "maxim,max5978", .data = &maxim_max5970},
+ {}
+};
+MODULE_DEVICE_TABLE(of, simple_mfd_i2c_of_match);
+
+static struct i2c_driver simple_mfd_i2c_driver = {
+ .probe = simple_mfd_i2c_probe,
+ .driver = {
+ .name = "simple-mfd-i2c",
+ .of_match_table = simple_mfd_i2c_of_match,
+ },
+};
+module_i2c_driver(simple_mfd_i2c_driver);
+
+MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
+MODULE_DESCRIPTION("Simple MFD - I2C driver");
+MODULE_LICENSE("GPL v2");