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Message-ID: <35b05950-4a72-9e00-50ab-ecd0a7e759a4@roeck-us.net>
Date: Mon, 26 Aug 2019 06:44:34 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
Jean Delvare <jdelvare@...e.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>
Cc: "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] hwmon: Add Synaptics AS370 PVT sensor driver
On 8/26/19 3:01 AM, Jisheng Zhang wrote:
> Add a new driver for Synaptics AS370 PVT sensors. Currently, only
> temperature is supported.
>
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
> ---
> drivers/hwmon/Kconfig | 10 +++
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/as370-hwmon.c | 158 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 169 insertions(+)
> create mode 100644 drivers/hwmon/as370-hwmon.c
>
> diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
> index 650dd71f9724..d31610933faa 100644
> --- a/drivers/hwmon/Kconfig
> +++ b/drivers/hwmon/Kconfig
> @@ -246,6 +246,16 @@ config SENSORS_ADT7475
> This driver can also be built as a module. If so, the module
> will be called adt7475.
>
> +config SENSORS_AS370
> + tristate "Synaptics AS370 SoC hardware monitoring driver"
I think this needs "depends on HAS_IOMEM".
> + help
> + If you say yes here you get support for the PVT sensors of
> + the Synaptics AS370 SoC
> +
> + This driver can also be built as a module. If so, the module
> + will be called as370-hwmon.
> +
> +
> config SENSORS_ASC7621
> tristate "Andigilog aSC7621"
> depends on I2C
> diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile
> index 8db472ea04f0..252e8a4c9781 100644
> --- a/drivers/hwmon/Makefile
> +++ b/drivers/hwmon/Makefile
> @@ -48,6 +48,7 @@ obj-$(CONFIG_SENSORS_ADT7475) += adt7475.o
> obj-$(CONFIG_SENSORS_APPLESMC) += applesmc.o
> obj-$(CONFIG_SENSORS_ARM_SCMI) += scmi-hwmon.o
> obj-$(CONFIG_SENSORS_ARM_SCPI) += scpi-hwmon.o
> +obj-$(CONFIG_SENSORS_AS370) += as370-hwmon.o
> obj-$(CONFIG_SENSORS_ASC7621) += asc7621.o
> obj-$(CONFIG_SENSORS_ASPEED) += aspeed-pwm-tacho.o
> obj-$(CONFIG_SENSORS_ATXP1) += atxp1.o
> diff --git a/drivers/hwmon/as370-hwmon.c b/drivers/hwmon/as370-hwmon.c
> new file mode 100644
> index 000000000000..98dfba45e1b0
> --- /dev/null
> +++ b/drivers/hwmon/as370-hwmon.c
> @@ -0,0 +1,158 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Synaptics AS370 SoC Hardware Monitoring Driver
> + *
> + * Copyright (C) 2018 Synaptics Incorporated
> + * Author: Jisheng Zhang <jszhang@...nel.org>
> + */
> +
> +#include <linux/bitops.h>
> +#include <linux/delay.h>
Unnecessary include file.
> +#include <linux/hwmon.h>
> +#include <linux/init.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#define CTRL 0x0
> +#define PD BIT(0)
> +#define EN BIT(1)
> +#define T_SEL BIT(2)
> +#define V_SEL BIT(3)
> +#define NMOS_SEL BIT(8)
> +#define PMOS_SEL BIT(9)
> +#define STS 0x4
> +#define BN_MASK (0xfff << 0)
How about using GENMASK() ?
> +#define EOC BIT(12)
> +
> +struct as370_hwmon {
> + void __iomem *base;
> +};
> +
> +static void init_pvt(struct as370_hwmon *hwmon)
> +{
> + u32 val;
> + void __iomem *addr = hwmon->base + CTRL;
> +
> + val = PD;
> + writel_relaxed(val, addr);
> + val |= T_SEL;
> + val &= ~V_SEL;
> + val &= ~NMOS_SEL;
> + val &= ~PMOS_SEL;
What is the point of this ? We know that val == PD here.
> + writel_relaxed(val, addr);
> + val |= EN;
> + writel_relaxed(val, addr);
> + val &= ~PD;
> + writel_relaxed(val, addr);
> +}
> +
> +static int read_pvt(struct as370_hwmon *hwmon)
> +{
> + return readl_relaxed(hwmon->base + STS) & BN_MASK;
> +}
Please fold into the calling code.
> +
> +static int as370_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
> + u32 attr, int channel, long *temp)
> +{
> + int val;
> + struct as370_hwmon *hwmon = dev_get_drvdata(dev);
> +
> + switch (attr) {
> + case hwmon_temp_input:
> + val = read_pvt(hwmon);
> + if (val < 0)
> + return val;
read_pvt() doesn't return a negative error code. This check is unnecessary.
> + *temp = val * 251802 / 4096 - 85525;
This results in rounding down the reported temperature. It is ok if it is
what you want; otherwise, I would suggest to use DIV_ROUND_CLOSEST().
> + break;
> + default:
> + return -EOPNOTSUPP;
> + }
> +
> + return 0;
> +}
> +
> +static umode_t
> +as370_hwmon_is_visible(const void *data, enum hwmon_sensor_types type,
> + u32 attr, int channel)
> +{
> + if (type != hwmon_temp)
> + return 0;
> +
> + switch (attr) {
> + case hwmon_temp_input:
> + return 0444;
> + default:
> + return 0;
> + }
> +}
> +
> +static const u32 as370_hwmon_temp_config[] = {
> + HWMON_T_INPUT,
> + 0
> +};
> +
> +static const struct hwmon_channel_info as370_hwmon_temp = {
> + .type = hwmon_temp,
> + .config = as370_hwmon_temp_config,
> +};
> +
> +static const struct hwmon_channel_info *as370_hwmon_info[] = {
> + &as370_hwmon_temp,
> + NULL
> +};
> +
> +static const struct hwmon_ops as370_hwmon_ops = {
> + .is_visible = as370_hwmon_is_visible,
> + .read = as370_hwmon_read,
> +};
> +
> +static const struct hwmon_chip_info as370_chip_info = {
> + .ops = &as370_hwmon_ops,
> + .info = as370_hwmon_info,
> +};
> +
> +static int as370_hwmon_probe(struct platform_device *pdev)
> +{
> + struct resource *res;
> + struct device *hwmon_dev;
> + struct as370_hwmon *hwmon;
> + struct device *dev = &pdev->dev;
> +
> + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
> + if (!hwmon)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + hwmon->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(hwmon->base))
> + return PTR_ERR(hwmon->base);
> +
> + init_pvt(hwmon);
> +
> + hwmon_dev = devm_hwmon_device_register_with_info(dev,
> + "as370_hwmon",
The "_hwmon" seems unnecessary. It will show up in "sensors" as part
of the sensor name. Is this really what you want ?
> + hwmon,
> + &as370_chip_info,
> + NULL);
> + return PTR_ERR_OR_ZERO(hwmon_dev);
> +}
> +
> +static const struct of_device_id as370_hwmon_match[] = {
> + { .compatible = "syna,as370-hwmon" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, as370_hwmon_match);
> +
> +static struct platform_driver as370_hwmon_driver = {
> + .probe = as370_hwmon_probe,
> + .driver = {
> + .name = "as370-hwmon",
> + .of_match_table = as370_hwmon_match,
> + },
> +};
> +module_platform_driver(as370_hwmon_driver);
> +
> +MODULE_AUTHOR("Jisheng Zhang<jszhang@...nel.org>");
> +MODULE_DESCRIPTION("Synaptics AS370 SoC hardware monitor");
> +MODULE_LICENSE("GPL v2");
>
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