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0160df2c35
FPGA on LX2160AQDS/LX2160ARDB connected on I2C bus, so add qixis driver which is basically an i2c client driver to control FPGA. Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/* Freescale QIXIS system controller driver.
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*
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* Copyright 2015 Freescale Semiconductor, Inc.
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* Copyright 2018-2019 NXP
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/mfd/core.h>
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#include <linux/of.h>
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#include <linux/regmap.h>
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/* QIXIS MAP */
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struct fsl_qixis_regs {
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u8 id; /* Identification Registers */
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u8 version; /* Version Register */
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u8 qixis_ver; /* QIXIS Version Register */
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u8 reserved1[0x1f];
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};
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struct qixis_priv {
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struct regmap *regmap;
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};
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static struct regmap_config qixis_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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};
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static const struct mfd_cell fsl_qixis_devs[] = {
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{
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.name = "reg-mux",
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.of_compatible = "reg-mux",
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},
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};
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static int fsl_qixis_i2c_probe(struct i2c_client *client)
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{
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struct qixis_priv *priv;
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int ret = 0;
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u32 qver;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
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return -EOPNOTSUPP;
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priv = devm_kzalloc(&client->dev, sizeof(struct qixis_priv),
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GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->regmap = regmap_init_i2c(client, &qixis_regmap_config);
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regmap_read(priv->regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
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&qver);
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pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
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i2c_set_clientdata(client, priv);
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if (of_device_is_compatible(client->dev.of_node, "simple-mfd"))
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ret = devm_mfd_add_devices(&client->dev, -1, fsl_qixis_devs,
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ARRAY_SIZE(fsl_qixis_devs), NULL, 0,
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NULL);
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if (ret)
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goto error;
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return ret;
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error:
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regmap_exit(priv->regmap);
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return ret;
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}
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static void fsl_qixis_i2c_remove(struct i2c_client *client)
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{
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struct qixis_priv *priv;
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priv = i2c_get_clientdata(client);
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regmap_exit(priv->regmap);
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}
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static const struct of_device_id fsl_qixis_i2c_of_match[] = {
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{ .compatible = "fsl,fpga-qixis-i2c" },
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{}
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};
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MODULE_DEVICE_TABLE(of, fsl_qixis_i2c_of_match);
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static struct i2c_driver fsl_qixis_i2c_driver = {
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.driver = {
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.name = "qixis_ctrl_i2c",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(fsl_qixis_i2c_of_match),
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},
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.probe = fsl_qixis_i2c_probe,
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.remove = fsl_qixis_i2c_remove,
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};
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module_i2c_driver(fsl_qixis_i2c_driver);
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MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
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MODULE_DESCRIPTION("Freescale QIXIS system controller driver");
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MODULE_LICENSE("GPL");
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