soc: fsl: add qixis driver

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>

diff --git a/drivers/soc/fsl/Kconfig b/drivers/soc/fsl/Kconfig
index 4df32bc..60a1f56 100644 (file)
--- a/drivers/soc/fsl/Kconfig
+++ b/drivers/soc/fsl/Kconfig
@@ -50,4 +50,15 @@ config FSL_RCPM
          tasks associated with power management, such as wakeup source control.
          Note that currently this driver will not support PowerPC based
          QorIQ processor.
+
+config FSL_QIXIS
+       tristate "QIXIS system controller driver"
+       depends on OF
+       select REGMAP_I2C
+       select REGMAP_MMIO
+       default n
+       help
+         Say y here to enable QIXIS system controller api. The qixis driver
+         provides FPGA functions to control system.
+
 endmenu

diff --git a/drivers/soc/fsl/Makefile b/drivers/soc/fsl/Makefile
index 906f1cd..c732383 100644 (file)
--- a/drivers/soc/fsl/Makefile
+++ b/drivers/soc/fsl/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_FSL_DPAA)                 += qbman/
 obj-$(CONFIG_QUICC_ENGINE)             += qe/
 obj-$(CONFIG_CPM)                      += qe/
 obj-$(CONFIG_FSL_RCPM)                 += rcpm.o
+obj-$(CONFIG_FSL_QIXIS)                += qixis_ctrl.o
 obj-$(CONFIG_FSL_GUTS)                 += guts.o
 obj-$(CONFIG_FSL_MC_DPIO)              += dpio/
 obj-$(CONFIG_DPAA2_CONSOLE)            += dpaa2-console.o

diff --git a/drivers/soc/fsl/qixis_ctrl.c b/drivers/soc/fsl/qixis_ctrl.c
new file mode 100644 (file)
index 0000000..cc4696c
--- /dev/null
+++ b/drivers/soc/fsl/qixis_ctrl.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+/* Freescale QIXIS system controller driver.
+ *
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ * Copyright 2018-2019 NXP
+ */
+
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/mfd/core.h>
+#include <linux/of.h>
+#include <linux/regmap.h>
+
+/* QIXIS MAP */
+struct fsl_qixis_regs {
+       u8              id;             /* Identification Registers */
+       u8              version;        /* Version Register */
+       u8              qixis_ver;      /* QIXIS Version Register */
+       u8              reserved1[0x1f];
+};
+
+struct qixis_priv {
+       struct regmap           *regmap;
+};
+
+static struct regmap_config qixis_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+};
+
+static const struct mfd_cell fsl_qixis_devs[] = {
+       {
+               .name = "reg-mux",
+               .of_compatible = "reg-mux",
+       },
+};
+
+static int fsl_qixis_i2c_probe(struct i2c_client *client)
+{
+       struct qixis_priv *priv;
+       int ret = 0;
+       u32 qver;
+
+       if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
+               return -EOPNOTSUPP;
+
+       priv = devm_kzalloc(&client->dev, sizeof(struct qixis_priv),
+                           GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->regmap = regmap_init_i2c(client, &qixis_regmap_config);
+       regmap_read(priv->regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
+                   &qver);
+       pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
+
+       i2c_set_clientdata(client, priv);
+
+       if (of_device_is_compatible(client->dev.of_node, "simple-mfd"))
+               ret = devm_mfd_add_devices(&client->dev, -1, fsl_qixis_devs,
+                                          ARRAY_SIZE(fsl_qixis_devs), NULL, 0,
+                                          NULL);
+       if (ret)
+               goto error;
+
+       return ret;
+error:
+       regmap_exit(priv->regmap);
+
+       return ret;
+}
+
+static int fsl_qixis_i2c_remove(struct i2c_client *client)
+{
+       struct qixis_priv *priv;
+
+       priv = i2c_get_clientdata(client);
+       regmap_exit(priv->regmap);
+
+       return 0;
+}
+
+static const struct of_device_id fsl_qixis_i2c_of_match[] = {
+       { .compatible = "fsl,fpga-qixis-i2c" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, fsl_qixis_i2c_of_match);
+
+static struct i2c_driver fsl_qixis_i2c_driver = {
+       .driver = {
+               .name   = "qixis_ctrl_i2c",
+               .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(fsl_qixis_i2c_of_match),
+       },
+       .probe_new      = fsl_qixis_i2c_probe,
+       .remove         = fsl_qixis_i2c_remove,
+};
+module_i2c_driver(fsl_qixis_i2c_driver);
+
+MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
+MODULE_DESCRIPTION("Freescale QIXIS system controller driver");
+MODULE_LICENSE("GPL");
+