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 hardware monitoring driver to support
MR75203 PVT controller.
Signed-off-by: Rahul Tanwar <[email protected]>
---
drivers/hwmon/Kconfig | 10 +
drivers/hwmon/Makefile | 1 +
drivers/hwmon/mr75203.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 616 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..30a70a3ae82b
--- /dev/null
+++ b/drivers/hwmon/mr75203.c
@@ -0,0 +1,605 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MaxLinear, Inc.
+ *
+ * This driver is a hardware monitoring driver 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/mod_devicetable.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/property.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 CLK_SYS_CYCLES_MAX 514
+#define CLK_SYS_CYCLES_MIN 2
+#define HZ_PER_MHZ 1000000L
+
+#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_US 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;
+};
+
+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:
+ ret = regmap_read_poll_timeout(t_map, SDIF_DONE(channel),
+ stat, stat & SDIF_SMPL_DONE,
+ PVT_POLL_DELAY_US,
+ PVT_POLL_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ regmap_read(t_map, SDIF_DATA(channel), &nbs);
+ nbs &= SAMPLE_DATA_MSK;
+
+ /*
+ * 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:
+ ret = regmap_read_poll_timeout(v_map, VM_SDIF_DONE(vm_idx),
+ stat, stat & SDIF_SMPL_DONE,
+ PVT_POLL_DELAY_US,
+ PVT_POLL_TIMEOUT_US);
+ if (ret)
+ return ret;
+
+ regmap_read(v_map, VM_SDIF_DATA(vm_idx), &n);
+ n &= SAMPLE_DATA_MSK;
+ /* 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) / HZ_PER_MHZ;
+ while (high >= low) {
+ middle = (low + high + 1) / 2;
+ key = DIV_ROUND_CLOSEST(sys_freq, middle);
+ if (key > CLK_SYS_CYCLES_MAX) {
+ low = middle + 1;
+ continue;
+ } else if (key < CLK_SYS_CYCLES_MIN) {
+ high = middle - 1;
+ continue;
+ }
+
+ break;
+ }
+
+ /*
+ * The system supports 'clk_sys' to 'clk_ip' frequency ratios
+ * from 2:1 to 512:1
+ */
+ key = clamp_val(key, CLK_SYS_CYCLES_MIN, CLK_SYS_CYCLES_MAX) - 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, 0x0);
+
+ ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
+ val, !(val & SDIF_BUSY),
+ PVT_POLL_DELAY_US,
+ PVT_POLL_TIMEOUT_US);
+ 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_US);
+ 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_US);
+ 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, BIT(p_num) - 1);
+ 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, 0x0);
+
+ ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
+ val, !(val & SDIF_BUSY),
+ PVT_POLL_DELAY_US,
+ PVT_POLL_TIMEOUT_US);
+ 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_US);
+ 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_US);
+ 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 pvt_device *pvt)
+{
+ struct device *dev = &pdev->dev;
+ struct regmap **reg_map;
+ void __iomem *io_base;
+
+ 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;
+
+ io_base = devm_platform_ioremap_resource_byname(pdev, reg_name);
+ 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", pvt);
+ if (ret)
+ return ret;
+
+ 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;
+ }
+
+ pvt->rst = devm_reset_control_get_exclusive(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");
+
+ 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)
+ return -ENODEV;
+
+ 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", pvt);
+ 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", pvt);
+ if (ret)
+ return ret;
+ }
+
+ if (vm_num) {
+ u32 num = vm_num;
+
+ ret = pvt_get_regmap(pdev, "vm", pvt);
+ 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 = device_property_read_u8_array(dev, "intel,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;
+
+ memset32(in_config, HWMON_I_INPUT, num);
+ 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;
+ }
+
+ pvt_chip_info.info = pvt_info;
+ hwmon_dev = devm_hwmon_device_register_with_info(dev, "pvt",
+ pvt,
+ &pvt_chip_info,
+ NULL);
+
+ 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);
+
+MODULE_LICENSE("GPL v2");
--
2.11.0
On 9/29/20 1:59 AM, 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 hardware monitoring driver to support
> MR75203 PVT controller.
>
> Signed-off-by: Rahul Tanwar <[email protected]>
> ---
> drivers/hwmon/Kconfig | 10 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/mr75203.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 616 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..30a70a3ae82b
> --- /dev/null
> +++ b/drivers/hwmon/mr75203.c
> @@ -0,0 +1,605 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2020 MaxLinear, Inc.
> + *
> + * This driver is a hardware monitoring driver for PVT controller
> + * (MR75203) which is used to configure & control Moortec embedded
> + * analog IP to enable multiple embedded temprature sensor(TS),
temperature
> + * voltage monitor(VM) & process detector(PD) modules.
> + */
> +#include <linux/clk.h>
> +#include <linux/hwmon.h>
> +#include <linux/module.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.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 CLK_SYS_CYCLES_MAX 514
> +#define CLK_SYS_CYCLES_MIN 2
> +#define HZ_PER_MHZ 1000000L
> +
> +#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_US 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;
> +};
> +
> +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;
else after return is unnecessary.
> + 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;
> +
Those checks are not really needed.
> + switch (attr) {
> + case hwmon_temp_input:
> + ret = regmap_read_poll_timeout(t_map, SDIF_DONE(channel),
> + stat, stat & SDIF_SMPL_DONE,
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT_US);
> + if (ret)
> + return ret;
> +
> + regmap_read(t_map, SDIF_DATA(channel), &nbs);
regmap_read() can return an error.
> + nbs &= SAMPLE_DATA_MSK;
> +
> + /*
> + * 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:
> + ret = regmap_read_poll_timeout(v_map, VM_SDIF_DONE(vm_idx),
> + stat, stat & SDIF_SMPL_DONE,
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT_US);
> + if (ret)
> + return ret;
> +
> + regmap_read(v_map, VM_SDIF_DATA(vm_idx), &n);
regmap_read can return an error.
> + n &= SAMPLE_DATA_MSK;
> + /* 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) / HZ_PER_MHZ;
> + while (high >= low) {
> + middle = (low + high + 1) / 2;
> + key = DIV_ROUND_CLOSEST(sys_freq, middle);
> + if (key > CLK_SYS_CYCLES_MAX) {
> + low = middle + 1;
> + continue;
> + } else if (key < CLK_SYS_CYCLES_MIN) {
> + high = middle - 1;
> + continue;
> + }
> +
> + break;
> + }
> +
> + /*
> + * The system supports 'clk_sys' to 'clk_ip' frequency ratios
> + * from 2:1 to 512:1
> + */
> + key = clamp_val(key, CLK_SYS_CYCLES_MIN, CLK_SYS_CYCLES_MAX) - 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, 0x0);
> +
regmap_write can return an error. If this doesn't apply here for some reason
(same as the reads), please add a note to the top of the driver explaining
the reason.
> + ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT_US);
> + 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_US);
> + 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_US);
> + 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, BIT(p_num) - 1);
> + 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, 0x0);
> +
> + ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
> + val, !(val & SDIF_BUSY),
> + PVT_POLL_DELAY_US,
> + PVT_POLL_TIMEOUT_US);
> + 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_US);
> + 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_US);
> + 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 pvt_device *pvt)
> +{
> + struct device *dev = &pdev->dev;
> + struct regmap **reg_map;
> + void __iomem *io_base;
> +
> + 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;
> +
> + io_base = devm_platform_ioremap_resource_byname(pdev, reg_name);
> + if (IS_ERR(io_base))
> + return PTR_ERR(io_base);
> +
> + pvt_regmap_config.name = reg_name;
This may be convenient, but I am concerned that it might cause trouble if there
is more than one such controller in the system. Can you confirm that there will
always be one, and exactly one, such device in any given system ?
> + *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", pvt);
> + if (ret)
> + return ret;
> +
> + 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;
> + }
> +
> + pvt->rst = devm_reset_control_get_exclusive(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");
> +
> + 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)
> + return -ENODEV;
> +
> + 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", pvt);
> + 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", pvt);
> + if (ret)
> + return ret;
> + }
> +
> + if (vm_num) {
> + u32 num = vm_num;
> +
> + ret = pvt_get_regmap(pdev, "vm", pvt);
> + 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 = device_property_read_u8_array(dev, "intel,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;
> +
> + memset32(in_config, HWMON_I_INPUT, num);
> + 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;
> + }
> +
> + pvt_chip_info.info = pvt_info;
> + hwmon_dev = devm_hwmon_device_register_with_info(dev, "pvt",
> + pvt,
> + &pvt_chip_info,
> + NULL);
> +
> + 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);
> +
> +MODULE_LICENSE("GPL v2");
>
Hi Guenter,
On 2/10/2020 2:26 am, Guenter Roeck wrote:
> On 9/29/20 1:59 AM, 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 hardware monitoring driver to support
>> MR75203 PVT controller.
>>
>> Signed-off-by: Rahul Tanwar <[email protected]>
>> ---
>> drivers/hwmon/Kconfig | 10 +
>> drivers/hwmon/Makefile | 1 +
>> drivers/hwmon/mr75203.c | 605 ++++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 616 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..30a70a3ae82b
>> --- /dev/null
>> +++ b/drivers/hwmon/mr75203.c
>> @@ -0,0 +1,605 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Copyright (C) 2020 MaxLinear, Inc.
>> + *
>> + * This driver is a hardware monitoring driver for PVT controller
>> + * (MR75203) which is used to configure & control Moortec embedded
>> + * analog IP to enable multiple embedded temprature sensor(TS),
>
> temperature
Well noted.
>> + * voltage monitor(VM) & process detector(PD) modules.
>> + */
>> +#include <linux/clk.h>
>> +#include <linux/hwmon.h>
>> +#include <linux/module.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/mutex.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/property.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 CLK_SYS_CYCLES_MAX 514
>> +#define CLK_SYS_CYCLES_MIN 2
>> +#define HZ_PER_MHZ 1000000L
>> +
>> +#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_US 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;
>> +};
>> +
>> +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;
> else after return is unnecessary.
Agree, will update.
>> + 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;
>> +
> Those checks are not really needed.
Well noted.
>> + switch (attr) {
>> + case hwmon_temp_input:
>> + ret = regmap_read_poll_timeout(t_map, SDIF_DONE(channel),
>> + stat, stat & SDIF_SMPL_DONE,
>> + PVT_POLL_DELAY_US,
>> + PVT_POLL_TIMEOUT_US);
>> + if (ret)
>> + return ret;
>> +
>> + regmap_read(t_map, SDIF_DATA(channel), &nbs);
> regmap_read() can return an error.
Yes, agree. Will update all regmap read/writes.
>> + nbs &= SAMPLE_DATA_MSK;
>> +
>> + /*
>> + * 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:
>> + ret = regmap_read_poll_timeout(v_map, VM_SDIF_DONE(vm_idx),
>> + stat, stat & SDIF_SMPL_DONE,
>> + PVT_POLL_DELAY_US,
>> + PVT_POLL_TIMEOUT_US);
>> + if (ret)
>> + return ret;
>> +
>> + regmap_read(v_map, VM_SDIF_DATA(vm_idx), &n);
> regmap_read can return an error.
>
>> + n &= SAMPLE_DATA_MSK;
>> + /* 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) / HZ_PER_MHZ;
>> + while (high >= low) {
>> + middle = (low + high + 1) / 2;
>> + key = DIV_ROUND_CLOSEST(sys_freq, middle);
>> + if (key > CLK_SYS_CYCLES_MAX) {
>> + low = middle + 1;
>> + continue;
>> + } else if (key < CLK_SYS_CYCLES_MIN) {
>> + high = middle - 1;
>> + continue;
>> + }
>> +
>> + break;
>> + }
>> +
>> + /*
>> + * The system supports 'clk_sys' to 'clk_ip' frequency ratios
>> + * from 2:1 to 512:1
>> + */
>> + key = clamp_val(key, CLK_SYS_CYCLES_MIN, CLK_SYS_CYCLES_MAX) - 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, 0x0);
>> +
> regmap_write can return an error. If this doesn't apply here for some reason
> (same as the reads), please add a note to the top of the driver explaining
> the reason.
>
>> + ret = regmap_read_poll_timeout(t_map, SDIF_STAT,
>> + val, !(val & SDIF_BUSY),
>> + PVT_POLL_DELAY_US,
>> + PVT_POLL_TIMEOUT_US);
>> + 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_US);
>> + 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_US);
>> + 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, BIT(p_num) - 1);
>> + 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, 0x0);
>> +
>> + ret = regmap_read_poll_timeout(v_map, SDIF_STAT,
>> + val, !(val & SDIF_BUSY),
>> + PVT_POLL_DELAY_US,
>> + PVT_POLL_TIMEOUT_US);
>> + 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_US);
>> + 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_US);
>> + 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 pvt_device *pvt)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct regmap **reg_map;
>> + void __iomem *io_base;
>> +
>> + 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;
>> +
>> + io_base = devm_platform_ioremap_resource_byname(pdev, reg_name);
>> + if (IS_ERR(io_base))
>> + return PTR_ERR(io_base);
>> +
>> + pvt_regmap_config.name = reg_name;
> This may be convenient, but I am concerned that it might cause trouble if there
> is more than one such controller in the system. Can you confirm that there will
> always be one, and exactly one, such device in any given system ?
Yes, it is confirmed that there will be only one and exactly one such controller
in any given system.
>> + *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", pvt);
>> + if (ret)
>> + return ret;
>> +
>> + 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;
>> + }
>> +
>> + pvt->rst = devm_reset_control_get_exclusive(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");
>> +
>> + 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)
>> + return -ENODEV;
>> +
>> + 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", pvt);
>> + 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", pvt);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + if (vm_num) {
>> + u32 num = vm_num;
>> +
>> + ret = pvt_get_regmap(pdev, "vm", pvt);
>> + 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 = device_property_read_u8_array(dev, "intel,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;
>> +
>> + memset32(in_config, HWMON_I_INPUT, num);
>> + 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;
>> + }
>> +
>> + pvt_chip_info.info = pvt_info;
>> + hwmon_dev = devm_hwmon_device_register_with_info(dev, "pvt",
>> + pvt,
>> + &pvt_chip_info,
>> + NULL);
>> +
>> + 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);
>> +
>> +MODULE_LICENSE("GPL v2");
>>
Thanks.
Regards,
Rahul