target/linux/layerscape/patches-5.4/301-arch-0011-drivers-soc-fsl-add-qixis-driver.patch

   1 From 68e332146b6f0a1d2a4514810986a7cf3c3117e3 Mon Sep 17 00:00:00 2001
   2 From: Pankaj Bansal <pankaj.bansal@nxp.com>
   3 Date: Thu, 28 Feb 2019 17:22:28 +0530
   4 Subject: [PATCH] drivers: soc: fsl: add qixis driver
   5
   6 FPGA on LX2160AQDS/LX2160ARDB connected on I2C bus, so add qixis driver
   7 which is basically an i2c client driver to control FPGA.
   8
   9 Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
  10 ---
  11  drivers/soc/fsl/Kconfig      |  11 +++++
  12  drivers/soc/fsl/Makefile     |   1 +
  13  drivers/soc/fsl/qixis_ctrl.c | 105 +++++++++++++++++++++++++++++++++++++++++++
  14  3 files changed, 117 insertions(+)
  15  create mode 100644 drivers/soc/fsl/qixis_ctrl.c
  16
  17 --- a/drivers/soc/fsl/Kconfig
  18 +++ b/drivers/soc/fsl/Kconfig
  19 @@ -40,4 +40,15 @@ config DPAA2_CONSOLE
  20           /dev/dpaa2_mc_console and /dev/dpaa2_aiop_console,
  21           which can be used to dump the Management Complex and AIOP
  22           firmware logs.
  23 +
  24 +config FSL_QIXIS
  25 +       tristate "QIXIS system controller driver"
  26 +       depends on OF
  27 +       select REGMAP_I2C
  28 +       select REGMAP_MMIO
  29 +       default n
  30 +       help
  31 +         Say y here to enable QIXIS system controller api. The qixis driver
  32 +         provides FPGA functions to control system.
  33 +
  34  endmenu
  35 --- a/drivers/soc/fsl/Makefile
  36 +++ b/drivers/soc/fsl/Makefile
  37 @@ -6,6 +6,7 @@
  38  obj-$(CONFIG_FSL_DPAA)                 += qbman/
  39  obj-$(CONFIG_QUICC_ENGINE)             += qe/
  40  obj-$(CONFIG_CPM)                      += qe/
  41 +obj-$(CONFIG_FSL_QIXIS)                += qixis_ctrl.o
  42  obj-$(CONFIG_FSL_GUTS)                 += guts.o
  43  obj-$(CONFIG_FSL_MC_DPIO)              += dpio/
  44  obj-$(CONFIG_DPAA2_CONSOLE)            += dpaa2-console.o
  45 --- /dev/null
  46 +++ b/drivers/soc/fsl/qixis_ctrl.c
  47 @@ -0,0 +1,105 @@
  48 +// SPDX-License-Identifier: GPL-2.0+
  49 +
  50 +/* Freescale QIXIS system controller driver.
  51 + *
  52 + * Copyright 2015 Freescale Semiconductor, Inc.
  53 + * Copyright 2018-2019 NXP
  54 + */
  55 +
  56 +#include <linux/err.h>
  57 +#include <linux/i2c.h>
  58 +#include <linux/module.h>
  59 +#include <linux/mfd/core.h>
  60 +#include <linux/of.h>
  61 +#include <linux/regmap.h>
  62 +
  63 +/* QIXIS MAP */
  64 +struct fsl_qixis_regs {
  65 +       u8              id;             /* Identification Registers */
  66 +       u8              version;        /* Version Register */
  67 +       u8              qixis_ver;      /* QIXIS Version Register */
  68 +       u8              reserved1[0x1f];
  69 +};
  70 +
  71 +struct qixis_priv {
  72 +       struct regmap           *regmap;
  73 +};
  74 +
  75 +static struct regmap_config qixis_regmap_config = {
  76 +       .reg_bits = 8,
  77 +       .val_bits = 8,
  78 +};
  79 +
  80 +static const struct mfd_cell fsl_qixis_devs[] = {
  81 +       {
  82 +               .name = "reg-mux",
  83 +               .of_compatible = "reg-mux",
  84 +       },
  85 +};
  86 +
  87 +static int fsl_qixis_i2c_probe(struct i2c_client *client)
  88 +{
  89 +       struct qixis_priv *priv;
  90 +       int ret = 0;
  91 +       u32 qver;
  92 +
  93 +       if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  94 +               return -EOPNOTSUPP;
  95 +
  96 +       priv = devm_kzalloc(&client->dev, sizeof(struct qixis_priv),
  97 +                           GFP_KERNEL);
  98 +       if (!priv)
  99 +               return -ENOMEM;
 100 +
 101 +       priv->regmap = regmap_init_i2c(client, &qixis_regmap_config);
 102 +       regmap_read(priv->regmap, offsetof(struct fsl_qixis_regs, qixis_ver),
 103 +                   &qver);
 104 +       pr_info("Freescale QIXIS Version: 0x%08x\n", qver);
 105 +
 106 +       i2c_set_clientdata(client, priv);
 107 +
 108 +       if (of_device_is_compatible(client->dev.of_node, "simple-mfd"))
 109 +               ret = devm_mfd_add_devices(&client->dev, -1, fsl_qixis_devs,
 110 +                                          ARRAY_SIZE(fsl_qixis_devs), NULL, 0,
 111 +                                          NULL);
 112 +       if (ret)
 113 +               goto error;
 114 +
 115 +       return ret;
 116 +error:
 117 +       regmap_exit(priv->regmap);
 118 +
 119 +       return ret;
 120 +}
 121 +
 122 +static int fsl_qixis_i2c_remove(struct i2c_client *client)
 123 +{
 124 +       struct qixis_priv *priv;
 125 +
 126 +       priv = i2c_get_clientdata(client);
 127 +       regmap_exit(priv->regmap);
 128 +
 129 +       return 0;
 130 +}
 131 +
 132 +static const struct of_device_id fsl_qixis_i2c_of_match[] = {
 133 +       { .compatible = "fsl,fpga-qixis-i2c" },
 134 +       {}
 135 +};
 136 +MODULE_DEVICE_TABLE(of, fsl_qixis_i2c_of_match);
 137 +
 138 +static struct i2c_driver fsl_qixis_i2c_driver = {
 139 +       .driver = {
 140 +               .name   = "qixis_ctrl_i2c",
 141 +               .owner  = THIS_MODULE,
 142 +               .of_match_table = of_match_ptr(fsl_qixis_i2c_of_match),
 143 +       },
 144 +       .probe_new      = fsl_qixis_i2c_probe,
 145 +       .remove         = fsl_qixis_i2c_remove,
 146 +};
 147 +module_i2c_driver(fsl_qixis_i2c_driver);
 148 +
 149 +MODULE_AUTHOR("Wang Dongsheng <dongsheng.wang@freescale.com>");
 150 +MODULE_DESCRIPTION("Freescale QIXIS system controller driver");
 151 +MODULE_LICENSE("GPL");
 152 +