On 9/8/20 11:52 PM, Rahul Tanwar wrote:
> PVT controller (MR75203) is used to configure & control
> Moortec embedded analog IP which contains temprature
> sensor(TS), voltage monitor(VM) & process detector(PD)
> modules. Add driver to support MR75203 PVT controller.
>
The subject needs to include a hint that this is a hardware monitoring
driver, and the above should be "Add hardware monitoring driver to ...".
> Signed-off-by: Rahul Tanwar <rahul.tanwar@xxxxxxxxxxxxxxx>
> ---
> drivers/hwmon/Kconfig | 10 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/mr75203.c | 617 ++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 628 insertions(+)
> create mode 100644 drivers/hwmon/mr75203.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 8dc28b26916e..2defb46677b4 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -1112,6 +1112,16 @@ config SENSORS_MENF21BMC_HWMON
> This driver can also be built as a module. If so the module
> will be called menf21bmc_hwmon.
>
> +config SENSORS_MR75203
> + tristate "Moortec Semiconductor MR75203 PVT Controller"
> + select REGMAP_MMIO
> + help
> + If you say yes here you get support for Moortec MR75203
> + PVT controller.
> +
> + This driver can also be built as a module. If so, the module
> + will be called mr75203.
> +
> config SENSORS_ADCXX
> tristate "National Semiconductor ADCxxxSxxx"
> depends on SPI_MASTER
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index a8f4b35b136b..bb4bd92a5149 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -142,6 +142,7 @@ obj-$(CONFIG_SENSORS_MCP3021) += mcp3021.o
> obj-$(CONFIG_SENSORS_TC654) += tc654.o
> obj-$(CONFIG_SENSORS_MLXREG_FAN) += mlxreg-fan.o
> obj-$(CONFIG_SENSORS_MENF21BMC_HWMON) += menf21bmc_hwmon.o
> +obj-$(CONFIG_SENSORS_MR75203) += mr75203.o
> obj-$(CONFIG_SENSORS_NCT6683) += nct6683.o
> obj-$(CONFIG_SENSORS_NCT6775) += nct6775.o
> obj-$(CONFIG_SENSORS_NCT7802) += nct7802.o
> diff --git a/drivers/hwmon/mr75203.c b/drivers/hwmon/mr75203.c
> new file mode 100644
> index 000000000000..8b616e53f27b
> --- /dev/null
> +++ b/drivers/hwmon/mr75203.c
> @@ -0,0 +1,617 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 MaxLinear, Inc.
> + *
> + * This driver is for PVT controller (MR75203) which is used
> + * to configure & control Moortec embedded analog IP to enable
> + * multiple embedded temprature sensor(TS), voltage monitor(VM)
> + * & process detector(PD) modules.
> + */
> +#include <linux/clk.h>
> +#include <linux/hwmon.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/reset.h>
> +
> +/* PVT Common register */
> +#define PVT_IP_CONFIG 0x04
> +#define TS_NUM_MSK GENMASK(4, 0)
> +#define TS_NUM_SFT 0
> +#define PD_NUM_MSK GENMASK(12, 8)
> +#define PD_NUM_SFT 8
> +#define VM_NUM_MSK GENMASK(20, 16)
> +#define VM_NUM_SFT 16
> +#define CH_NUM_MSK GENMASK(31, 24)
> +#define CH_NUM_SFT 24
> +
> +/* Macro Common Register */
> +#define CLK_SYNTH 0x00
> +#define CLK_SYNTH_LO_SFT 0
> +#define CLK_SYNTH_HI_SFT 8
> +#define CLK_SYNTH_HOLD_SFT 16
> +#define CLK_SYNTH_EN BIT(24)
> +
> +#define SDIF_DISABLE 0x04
> +
> +#define SDIF_STAT 0x08
> +#define SDIF_BUSY BIT(0)
> +#define SDIF_LOCK BIT(1)
> +
> +#define SDIF_W 0x0c
> +#define SDIF_PROG BIT(31)
> +#define SDIF_WRN_W BIT(27)
> +#define SDIF_WRN_R 0x00
> +#define SDIF_ADDR_SFT 24
> +
> +#define SDIF_HALT 0x10
> +#define SDIF_CTRL 0x14
> +#define SDIF_SMPL_CTRL 0x20
> +
> +/* TS & PD Individual Macro Register */
> +#define COM_REG_SIZE 0x40
> +
> +#define SDIF_DONE(n) (COM_REG_SIZE + 0x14 + 0x40 * (n))
> +#define SDIF_SMPL_DONE BIT(0)
> +
> +#define SDIF_DATA(n) (COM_REG_SIZE + 0x18 + 0x40 * (n))
> +#define SAMPLE_DATA_MSK GENMASK(15, 0)
> +
> +#define HILO_RESET(n) (COM_REG_SIZE + 0x2c + 0x40 * (n))
> +
> +/* VM Individual Macro Register */
> +#define VM_COM_REG_SIZE 0x200
> +#define VM_SDIF_DONE(n) (VM_COM_REG_SIZE + 0x34 + 0x200 * (n))
> +#define VM_SDIF_DATA(n) (VM_COM_REG_SIZE + 0x40 + 0x200 * (n))
> +
> +/* SDA Slave Register */
> +#define IP_CTRL 0x00
> +#define IP_RST_REL BIT(1)
> +#define IP_RUN_CONT BIT(3)
> +#define IP_AUTO BIT(8)
> +#define IP_VM_MODE BIT(10)
> +
> +#define IP_CFG 0x01
> +#define CFG0_MODE_2 BIT(0)
> +#define CFG0_PARALLEL_OUT 0
> +#define CFG0_12_BIT 0
> +#define CFG1_VOL_MEAS_MODE 0
> +#define CFG1_PARALLEL_OUT 0
> +#define CFG1_14_BIT 0
> +
> +#define IP_DATA 0x03
> +
> +#define IP_POLL 0x04
> +#define VM_CH_INIT BIT(20)
> +#define VM_CH_REQ BIT(21)
> +
> +#define IP_TMR 0x05
> +#define POWER_DELAY_CYCLE_256 0x80
> +#define POWER_DELAY_CYCLE_64 0x40
> +
> +#define PVT_POLL_DELAY_US 20
> +#define PVT_POLL_TIMEOUT 20000
> +#define PVT_H_CONST 100000
> +#define PVT_CAL5_CONST 2047
> +#define PVT_G_CONST 40000
> +#define PVT_CONV_BITS 10
> +#define PVT_N_CONST 90
> +#define PVT_R_CONST 245805
> +
> +struct pvt_device {
> + struct regmap *c_map;
> + struct regmap *t_map;
> + struct regmap *p_map;
> + struct regmap *v_map;
> + struct clk *clk;
> + struct reset_control *rst;
> + u32 t_num;
> + u32 p_num;
> + u32 v_num;
> + u32 ip_freq;
> + u8 *vm_idx;
> + struct mutex lock; /* lock to protect register */
> +};
> +
> +static umode_t pvt_is_visible(const void *data, enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + switch (type) {
> + case hwmon_temp:
> + if (attr == hwmon_temp_input)
> + return 0444;
> + else
> + return 0;
> + case hwmon_in:
> + if (attr == hwmon_in_input)
> + return 0444;
> + else
> + return 0;
> + default:
> + return 0;
> + }
> +}
> +
> +static int pvt_read_temp(struct device *dev, u32 attr, int channel, long *val)
> +{
> + struct pvt_device *pvt = dev_get_drvdata(dev);
> + struct regmap *t_map = pvt->t_map;
> + u32 stat, nbs;
> + int ret;
> + u64 tmp;
> +
> + if (channel >= pvt->t_num)
> + return -EINVAL;
> +
> + switch (attr) {
> + case hwmon_temp_input:
> + mutex_lock(&pvt->lock);
> + ret = regmap_read_poll_timeout(t_map, SDIF_DONE(channel),
> + stat, stat & SDIF_SMPL_DONE,
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret) {
> + mutex_unlock(&pvt->lock);
> + return ret;
> + }
> +
> + regmap_read(t_map, SDIF_DATA(channel), &nbs);
> + nbs &= SAMPLE_DATA_MSK;
> + mutex_unlock(&pvt->lock);
> +
> + /*
> + * Convert the register value to
> + * degrees centigrade temperature
> + */
> + tmp = nbs * PVT_H_CONST;
> + do_div(tmp, PVT_CAL5_CONST);
> + *val = tmp - PVT_G_CONST - pvt->ip_freq;
> +
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int pvt_read_in(struct device *dev, u32 attr, int channel, long *val)
> +{
> + struct pvt_device *pvt = dev_get_drvdata(dev);
> + struct regmap *v_map = pvt->v_map;
> + u32 n, stat;
> + u8 vm_idx;
> + int ret;
> +
> + if (channel >= pvt->v_num)
> + return -EINVAL;
> +
> + vm_idx = pvt->vm_idx[channel];
> +
> + switch (attr) {
> + case hwmon_in_input:
> + mutex_lock(&pvt->lock);
> + ret = regmap_read_poll_timeout(v_map, VM_SDIF_DONE(vm_idx),
> + stat, stat & SDIF_SMPL_DONE,
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret) {
> + mutex_unlock(&pvt->lock);
> + return ret;
> + }
> +
> + regmap_read(v_map, VM_SDIF_DATA(vm_idx), &n);
> + n &= SAMPLE_DATA_MSK;
> + mutex_unlock(&pvt->lock);
> +
> +
> + /* Convert the N bitstream count into voltage */
> + *val = (PVT_N_CONST * n - PVT_R_CONST) >> PVT_CONV_BITS;
> +
> + return 0;
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int pvt_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *val)
> +{
> + switch (type) {
> + case hwmon_temp:
> + return pvt_read_temp(dev, attr, channel, val);
> + case hwmon_in:
> + return pvt_read_in(dev, attr, channel, val);
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static const u32 pvt_chip_config[] = {
> + HWMON_C_REGISTER_TZ,
> + 0
> +};
> +
> +static const struct hwmon_channel_info pvt_chip = {
> + .type = hwmon_chip,
> + .config = pvt_chip_config,
> +};
> +
> +static struct hwmon_channel_info pvt_temp = {
> + .type = hwmon_temp,
> +};
> +
> +static struct hwmon_channel_info pvt_in = {
> + .type = hwmon_in,
> +};
> +
> +static const struct hwmon_ops pvt_hwmon_ops = {
> + .is_visible = pvt_is_visible,
> + .read = pvt_read,
> +};
> +
> +static struct hwmon_chip_info pvt_chip_info = {
> + .ops = &pvt_hwmon_ops,
> +};
> +
> +static int pvt_init(struct pvt_device *pvt)
> +{
> + u16 sys_freq, key, middle, low = 4, high = 8;
> + struct regmap *t_map = pvt->t_map;
> + struct regmap *p_map = pvt->p_map;
> + struct regmap *v_map = pvt->v_map;
> + u32 t_num = pvt->t_num;
> + u32 p_num = pvt->p_num;
> + u32 v_num = pvt->v_num;
> + u32 clk_synth, val;
> + int ret;
> +
> + sys_freq = clk_get_rate(pvt->clk) / 1000000;
> + while (high >= low) {
> + middle = DIV_ROUND_CLOSEST(low + high, 2);
> + key = DIV_ROUND_CLOSEST(sys_freq, middle);
> + if (key > 514) {
> + low = middle + 1;
> + continue;
> + } else if (key < 2) {
> + high = middle - 1;
> + continue;
> + }
> +
> + break;
> + }
> +
> + key = clamp_val(key, 2, 514) - 2;
> +
> + clk_synth = ((key + 1) >> 1) << CLK_SYNTH_LO_SFT |
> + (key >> 1) << CLK_SYNTH_HI_SFT |
> + (key >> 1) << CLK_SYNTH_HOLD_SFT | CLK_SYNTH_EN;
> +
> + pvt->ip_freq = sys_freq * 100 / (key + 2);
> +
> + if (t_num) {
> + regmap_write(t_map, SDIF_SMPL_CTRL, 0x0);
> + regmap_write(t_map, SDIF_HALT, 0x0);
> + regmap_write(t_map, CLK_SYNTH, clk_synth);
> + regmap_write(t_map, SDIF_DISABLE, 0);
> +
> + ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = CFG0_MODE_2 | CFG0_PARALLEL_OUT | CFG0_12_BIT |
> + IP_CFG << SDIF_ADDR_SFT | SDIF_WRN_W | SDIF_PROG;
> + regmap_write(t_map, SDIF_W, val);
> +
> + ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = POWER_DELAY_CYCLE_256 | IP_TMR << SDIF_ADDR_SFT |
> + SDIF_WRN_W | SDIF_PROG;
> + regmap_write(t_map, SDIF_W, val);
> +
> + ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = IP_RST_REL | IP_RUN_CONT | IP_AUTO |
> + IP_CTRL << SDIF_ADDR_SFT |
> + SDIF_WRN_W | SDIF_PROG;
> + regmap_write(t_map, SDIF_W, val);
> + }
> +
> + if (p_num) {
> + regmap_write(p_map, SDIF_HALT, 0x0);
> + regmap_write(p_map, SDIF_DISABLE, GENMASK(p_num - 1, 0));
> + regmap_write(p_map, CLK_SYNTH, clk_synth);
> + }
> +
> + if (v_num) {
> + regmap_write(v_map, SDIF_SMPL_CTRL, 0x0);
> + regmap_write(v_map, SDIF_HALT, 0x0);
> + regmap_write(v_map, CLK_SYNTH, clk_synth);
> + regmap_write(v_map, SDIF_DISABLE, 0);
> +
> + ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = CFG1_VOL_MEAS_MODE | CFG1_PARALLEL_OUT |
> + CFG1_14_BIT | IP_CFG << SDIF_ADDR_SFT |
> + SDIF_WRN_W | SDIF_PROG;
> + regmap_write(v_map, SDIF_W, val);
> +
> + ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = POWER_DELAY_CYCLE_64 | IP_TMR << SDIF_ADDR_SFT |
> + SDIF_WRN_W | SDIF_PROG;
> + regmap_write(v_map, SDIF_W, val);
> +
> + ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT);
> + if (ret)
> + return ret;
> +
> + val = IP_RST_REL | IP_RUN_CONT | IP_AUTO | IP_VM_MODE |
> + IP_CTRL << SDIF_ADDR_SFT |
> + SDIF_WRN_W | SDIF_PROG;
> + regmap_write(v_map, SDIF_W, val);
> + }
> +
> + return 0;
> +}
> +
> +static struct regmap_config pvt_regmap_config = {
> + .reg_bits = 32,
> + .reg_stride = 4,
> + .val_bits = 32,
> +};
> +
> +static int pvt_get_regmap(struct platform_device *pdev, char *reg_name)
> +{
> + struct device *dev = &pdev->dev;
> + struct pvt_device *pvt = platform_get_drvdata(pdev);
I am quite at loss how this is supposed to work. Platform driver
data is not initialized with a pointer to struct pvt_device at this point.
How does this code not crash ? What am I missing ?
> + struct regmap **reg_map;
> + void __iomem *io_base;
> + struct resource *res;
> +
> + if (!strcmp(reg_name, "common"))
> + reg_map = &pvt->c_map;
> + else if (!strcmp(reg_name, "ts"))
> + reg_map = &pvt->t_map;
> + else if (!strcmp(reg_name, "pd"))
> + reg_map = &pvt->p_map;
> + else if (!strcmp(reg_name, "vm"))
> + reg_map = &pvt->v_map;
> + else
> + return -EINVAL;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, reg_name);
> + io_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(io_base))
> + return PTR_ERR(io_base);
> +
> + pvt_regmap_config.name = reg_name;
> + *reg_map = devm_regmap_init_mmio(dev, io_base, &pvt_regmap_config);
> + if (IS_ERR(*reg_map)) {
> + dev_err(dev, "failed to init register map\n");
> + return PTR_ERR(*reg_map);
> + }
> +
> + return 0;
> +}
> +
> +static void pvt_clk_disable(void *data)
> +{
> + struct pvt_device *pvt = data;
> +
> + clk_disable_unprepare(pvt->clk);
> +}
> +
> +static int pvt_clk_enable(struct device *dev, struct pvt_device *pvt)
> +{
> + int ret;
> +
> + ret = clk_prepare_enable(pvt->clk);
> + if (ret)
> + return ret;
> +
> + return devm_add_action_or_reset(dev, pvt_clk_disable, pvt);
> +}
> +
> +static void pvt_reset_control_assert(void *data)
> +{
> + struct pvt_device *pvt = data;
> +
> + reset_control_assert(pvt->rst);
> +}
> +
> +static int pvt_reset_control_deassert(struct device *dev, struct pvt_device *pvt)
> +{
> + int ret;
> +
> + ret = reset_control_deassert(pvt->rst);
> + if (ret)
> + return ret;
> +
> + return devm_add_action_or_reset(dev, pvt_reset_control_assert, pvt);
> +}
> +
> +static int mr75203_probe(struct platform_device *pdev)
> +{
> + const struct hwmon_channel_info **pvt_info;
> + u32 ts_num, vm_num, pd_num, val, index, i;
> + struct device *dev = &pdev->dev;
> + u32 *temp_config, *in_config;
> + struct device *hwmon_dev;
> + struct pvt_device *pvt;
> + int ret;
> +
> + pvt = devm_kzalloc(dev, sizeof(*pvt), GFP_KERNEL);
> + if (!pvt)
> + return -ENOMEM;
> +
> + ret = pvt_get_regmap(pdev, "common");
> + if (ret)
> + return ret;
> +
> + pvt->rst = devm_reset_control_get(dev, NULL);
> + if (IS_ERR(pvt->rst))
> + return dev_err_probe(dev, PTR_ERR(pvt->rst),
> + "failed to get reset control\n");
> +
> + ret = pvt_reset_control_deassert(dev, pvt);
> + if (ret)
> + return dev_err_probe(dev, ret, "cannot deassert reset control\n");
> +
> + pvt->clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(pvt->clk))
> + return dev_err_probe(dev, PTR_ERR(pvt->clk), "failed to get clock\n");
> +
> + ret = pvt_clk_enable(dev, pvt);
> + if (ret) {
> + dev_err(dev, "failed to enable clock\n");
> + return ret;
> + }
> +
> + regmap_read(pvt->c_map, PVT_IP_CONFIG, &val);
> + ts_num = (val & TS_NUM_MSK) >> TS_NUM_SFT;
> + pd_num = (val & PD_NUM_MSK) >> PD_NUM_SFT;
> + vm_num = (val & VM_NUM_MSK) >> VM_NUM_SFT;
> + pvt->t_num = ts_num;
> + pvt->p_num = pd_num;
> + pvt->v_num = vm_num;
> + val = 0;
> + if (ts_num)
> + val++;
> + if (vm_num)
> + val++;
> + if (!val && !pd_num) {
> + dev_err(dev, "None of TS, VM or PD configured\n");
> + return -EINVAL;
> + }
If ts_num and vm_num are both 0, the driver doesn't create any attributes and
would just sit there. What would be the point of that ?
> +
> + pvt_info = devm_kcalloc(dev, val + 2, sizeof(*pvt_info), GFP_KERNEL);
> + if (!pvt_info)
> + return -ENOMEM;
> + pvt_info[0] = &pvt_chip;
> + index = 1;
> +
> + if (ts_num) {
> + ret = pvt_get_regmap(pdev, "ts");
> + if (ret)
> + return ret;
> +
> + temp_config = devm_kcalloc(dev, ts_num + 1,
> + sizeof(*temp_config), GFP_KERNEL);
> + if (!temp_config)
> + return -ENOMEM;
> +
> + for (i = 0; i < ts_num; i++)
> + temp_config[i] = HWMON_T_INPUT;
> +
> + temp_config[ts_num] = 0;
> + pvt_temp.config = temp_config;
> +
> + pvt_info[index++] = &pvt_temp;
> + }
> +
> + if (pd_num) {
> + ret = pvt_get_regmap(pdev, "pd");
> + if (ret)
> + return ret;
> + }
> +
> + if (vm_num) {
> + u32 num = vm_num;
> +
> + ret = pvt_get_regmap(pdev, "vm");
> + if (ret)
> + return ret;
> +
> + pvt->vm_idx = devm_kcalloc(dev, vm_num, sizeof(*pvt->vm_idx),
> + GFP_KERNEL);
> + if (!pvt->vm_idx)
> + return -ENOMEM;
> +
> + for (i = 0; i < vm_num; i++)
> + pvt->vm_idx[i] = i;
> +
> + ret = of_property_read_u8_array(dev->of_node, "vm-map",
> + pvt->vm_idx, vm_num);
> +
> + if (!ret)
> + for (i = 0; i < vm_num; i++)
> + if (pvt->vm_idx[i] >= vm_num ||
> + pvt->vm_idx[i] == 0xff) {
> + num = i;
> + break;
> + }
> +
> + in_config = devm_kcalloc(dev, num + 1,
> + sizeof(*in_config), GFP_KERNEL);
> + if (!in_config)
> + return -ENOMEM;
> +
> + for (i = 0; i < num; i++)
> + in_config[i] = HWMON_I_INPUT;
> +
> + in_config[num] = 0;
> + pvt_in.config = in_config;
> +
> + pvt_info[index++] = &pvt_in;
> + }
> +
> + ret = pvt_init(pvt);
> + if (ret) {
> + dev_err(dev, "failed to init pvt: %d\n", ret);
> + return ret;
> + }
> +
> + mutex_init(&pvt->lock);
> +
> + pvt_info[index] = NULL;
Unnecessary.
> + pvt_chip_info.info = pvt_info;
> + hwmon_dev = devm_hwmon_device_register_with_info(dev, "pvt",
> + pvt,
> + &pvt_chip_info,
> + NULL);
> +
> + platform_set_drvdata(pdev, pvt);
Again, I fail to understand how this is supposed to work.
> + return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct of_device_id moortec_pvt_of_match[] = {
> + { .compatible = "moortec,mr75203" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, moortec_pvt_of_match);
> +
> +static struct platform_driver moortec_pvt_driver = {
> + .driver = {
> + .name = "moortec-pvt",
> + .of_match_table = moortec_pvt_of_match,
> + },
> + .probe = mr75203_probe,
> +};
> +module_platform_driver(moortec_pvt_driver);
>
