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Date: Fri, 31 May 2024 07:45:37 +0800
From: Inochi Amaoto <inochiama@...look.com>
To: Haylen Chu <heylenay@...look.com>,
"Rafael J. Wysocki" <rafael@...nel.org>, Daniel Lezcano <daniel.lezcano@...aro.org>,
Zhang Rui <rui.zhang@...el.com>, Lukasz Luba <lukasz.luba@....com>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
Chen Wang <unicorn_wang@...look.com>, Inochi Amaoto <inochiama@...look.com>,
Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>, Jisheng Zhang <jszhang@...nel.org>
Cc: linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH 3/3] thermal: cv180x: Add cv180x thermal driver support
On Thu, May 30, 2024 at 01:48:27PM GMT, Haylen Chu wrote:
> Add support for cv180x SoCs integrated thermal sensors.
>
> Signed-off-by: Haylen Chu <heylenay@...look.com>
> ---
> drivers/thermal/Kconfig | 6 +
> drivers/thermal/Makefile | 1 +
> drivers/thermal/cv180x_thermal.c | 210 +++++++++++++++++++++++++++++++
> 3 files changed, 217 insertions(+)
> create mode 100644 drivers/thermal/cv180x_thermal.c
>
> diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
> index 204ed89a3ec9..f53c973a361d 100644
> --- a/drivers/thermal/Kconfig
> +++ b/drivers/thermal/Kconfig
> @@ -514,4 +514,10 @@ config LOONGSON2_THERMAL
> is higher than the high temperature threshold or lower than the low
> temperature threshold, the interrupt will occur.
>
> +config CV180X_THERMAL
> + tristate "Temperature sensor driver for Sophgo CV180X"
> + help
> + If you say yes here you get support for thermal sensor integrated in
> + Sophgo CV180X SoCs.
> +
> endif
> diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile
> index 5cdf7d68687f..5b59bde8a579 100644
> --- a/drivers/thermal/Makefile
> +++ b/drivers/thermal/Makefile
> @@ -65,3 +65,4 @@ obj-$(CONFIG_AMLOGIC_THERMAL) += amlogic_thermal.o
> obj-$(CONFIG_SPRD_THERMAL) += sprd_thermal.o
> obj-$(CONFIG_KHADAS_MCU_FAN_THERMAL) += khadas_mcu_fan.o
> obj-$(CONFIG_LOONGSON2_THERMAL) += loongson2_thermal.o
> +obj-$(CONFIG_CV180X_THERMAL) += cv180x_thermal.o
> diff --git a/drivers/thermal/cv180x_thermal.c b/drivers/thermal/cv180x_thermal.c
> new file mode 100644
> index 000000000000..618e031b4515
> --- /dev/null
> +++ b/drivers/thermal/cv180x_thermal.c
> @@ -0,0 +1,210 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2021 CVITEK Inc.
There is no CVITEK anyway, use SOPHGO instead.
> + * Copyright (C) 2024 Haylen Chu <heylenay@...look.com>
> + */
> +
> +#include <linux/bits.h>
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/io.h>
> +#include <linux/thermal.h>
> +
> +#define TEMPSEN_VERSION 0x0
> +#define TEMPSEN_CTRL 0x4
> +#define TEMPSEN_CTRL_EN BIT(0)
> +#define TEMPSEN_CTRL_SEL_MASK GENMASK(7, 4)
> +#define TEMPSEN_CTRL_SEL_OFFSET 4
> +#define TEMPSEN_STATUS 0x8
> +#define TEMPSEN_SET 0xc
> +#define TEMPSEN_SET_CHOPSEL_MASK GENMASK(5, 4)
> +#define TEMPSEN_SET_CHOPSEL_OFFSET 4
> +#define TEMPSEN_SET_CHOPSEL_128T 0
> +#define TEMPSEN_SET_CHOPSEL_256T 1
> +#define TEMPSEN_SET_CHOPSEL_512T 2
> +#define TEMPSEN_SET_CHOPSEL_1024T 3
> +#define TEMPSEN_SET_ACCSEL_MASK GENMASK(7, 6)
> +#define TEMPSEN_SET_ACCSEL_OFFSET 6
> +#define TEMPSEN_SET_ACCSEL_512T 0
> +#define TEMPSEN_SET_ACCSEL_1024T 1
> +#define TEMPSEN_SET_ACCSEL_2048T 2
> +#define TEMPSEN_SET_ACCSEL_4096T 3
> +#define TEMPSEN_SET_CYC_CLKDIV_MASK GENMASK(15, 8)
> +#define TEMPSEN_SET_CYC_CLKDIV_OFFSET 8
> +#define TEMPSEN_INTR_EN 0x10
> +#define TEMPSEN_INTR_CLR 0x14
> +#define TEMPSEN_INTR_STA 0x18
> +#define TEMPSEN_INTR_RAW 0x1c
> +#define TEMPSEN_RESULT(n) (0x20 + (n) * 4)
> +#define TEMPSEN_RESULT_RESULT_MASK GENMASK(12, 0)
> +#define TEMPSEN_RESULT_MAX_RESULT_MASK GENMASK(28, 16)
> +#define TEMPSEN_RESULT_CLR_MAX_RESULT BIT(31)
> +#define TEMPSEN_AUTO_PERIOD 0x64
> +#define TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK GENMASK(23, 0)
> +#define TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET 0
I suggest adding extra indent to the register value macro. It is too hard to
identify which one is register offset, which one it register value.
> +
> +struct cv180x_thermal_zone {
> + struct device *dev;
> + void __iomem *base;
> + struct clk *clk_tempsen;
> +};
> +
> +static void cv180x_thermal_init(struct cv180x_thermal_zone *ctz)
> +{
> + void __iomem *base = ctz->base;
> + u32 regval;
> +
> + writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
> + writel(TEMPSEN_RESULT_CLR_MAX_RESULT, base + TEMPSEN_RESULT(0));
> +
> + regval = readl(base + TEMPSEN_SET);
> + regval &= ~TEMPSEN_SET_CHOPSEL_MASK;
> + regval &= ~TEMPSEN_SET_ACCSEL_MASK;
> + regval &= ~TEMPSEN_SET_CYC_CLKDIV_MASK;
> + regval |= TEMPSEN_SET_CHOPSEL_1024T << TEMPSEN_SET_CHOPSEL_OFFSET;
> + regval |= TEMPSEN_SET_ACCSEL_2048T << TEMPSEN_SET_ACCSEL_OFFSET;
> + regval |= 0x31 << TEMPSEN_SET_CYC_CLKDIV_OFFSET;
> + writel(regval, base + TEMPSEN_SET);
> +
> + regval = readl(base + TEMPSEN_AUTO_PERIOD);
> + regval &= ~TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_MASK;
> + regval |= 0x100000 << TEMPSEN_AUTO_PERIOD_AUTO_CYCLE_OFFSET;
> + writel(regval, base + TEMPSEN_AUTO_PERIOD);
> +
> + regval = readl(base + TEMPSEN_CTRL);
> + regval &= ~TEMPSEN_CTRL_SEL_MASK;
> + regval |= 1 << TEMPSEN_CTRL_SEL_OFFSET;
> + regval |= TEMPSEN_CTRL_EN;
> + writel(regval, base + TEMPSEN_CTRL);
> +}
The sensors of CV1800 support various periods, I think you should add
support for all of them and let user select them. The configuration
you use now can be left as the default.
> +
> +static void cv180x_thermal_deinit(struct cv180x_thermal_zone *ct)
> +{
> + void __iomem *base = ct->base;
> + u32 regval;
> +
> + regval = readl(base + TEMPSEN_CTRL);
> + regval &= ~(TEMPSEN_CTRL_SEL_MASK | TEMPSEN_CTRL_EN);
> + writel(regval, base + TEMPSEN_CTRL);
> +
> + writel(readl(base + TEMPSEN_INTR_RAW), base + TEMPSEN_INTR_CLR);
> +}
> +
> +static int calc_temp(uint32_t result)
Add "cv180x" prefix.
> +{
> + return ((result * 1000) * 716 / 2048 - 273000);
> +}
Why these magic number, I have not see any info in the document.
> +
> +static int cv180x_get_temp(struct thermal_zone_device *tdev, int *temperature)
> +{
> + struct cv180x_thermal_zone *ctz = thermal_zone_device_priv(tdev);
> + void __iomem *base = ctz->base;
> + u32 result;
> +
> + result = readl(base + TEMPSEN_RESULT(0)) & TEMPSEN_RESULT_RESULT_MASK;
> + *temperature = calc_temp(result);
> +
> + return 0;
> +}
> +
> +static const struct thermal_zone_device_ops cv180x_thermal_ops = {
> + .get_temp = cv180x_get_temp,
> +};
> +
> +static const struct of_device_id cv180x_thermal_of_match[] = {
> + {
> + .compatible = "sophgo,cv180x-thermal",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, cv180x_thermal_of_match);
> +
> +static int cv180x_thermal_probe(struct platform_device *pdev)
> +{
> + struct cv180x_thermal_zone *ctz;
> + struct thermal_zone_device *tz;
> + struct resource *res;
> +
> + ctz = devm_kzalloc(&pdev->dev, sizeof(*ctz), GFP_KERNEL);
> + if (!ctz)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + ctz->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(ctz->base))
> + return dev_err_probe(&pdev->dev, PTR_ERR(ctz->base),
> + "failed to map tempsen registers\n");
> +
> + ctz->clk_tempsen = devm_clk_get(&pdev->dev, "clk_tempsen");
> + if (IS_ERR(ctz->clk_tempsen))
> + return dev_err_probe(&pdev->dev, PTR_ERR(ctz->clk_tempsen),
> + "failed to get clk_tempsen\n");
> +
> + clk_prepare_enable(ctz->clk_tempsen);
> +
> + ctz->dev = &pdev->dev;
> +
> + cv180x_thermal_init(ctz);
> +
> + platform_set_drvdata(pdev, ctz);
Set this after register thermal zone.
> +
> + tz = devm_thermal_of_zone_register(&pdev->dev, 0, ctz,
> + &cv180x_thermal_ops);
> + if (IS_ERR(tz))
> + return dev_err_probe(&pdev->dev, PTR_ERR(tz),
> + "failed to register thermal zone\n");
> +
> + return 0;
> +}
> +
> +static int cv180x_thermal_remove(struct platform_device *pdev)
> +{
> + struct cv180x_thermal_zone *ctz = platform_get_drvdata(pdev);
> +
> + cv180x_thermal_deinit(ctz);
> + clk_disable_unprepare(ctz->clk_tempsen);
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int cv180x_thermal_suspend(struct device *dev)
> +{
> + struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
> +
> + cv180x_thermal_deinit(ctz);
> + clk_disable_unprepare(ctz->clk_tempsen);
> +
> + return 0;
> +}
> +
> +static int cv180x_thermal_resume(struct device *dev)
> +{
> + struct cv180x_thermal_zone *ctz = dev_get_drvdata(dev);
> +
> + clk_prepare_enable(ctz->clk_tempsen);
> + cv180x_thermal_init(ctz);
> +
> + return 0;
> +}
> +#endif /* CONFIG_PM_SLEEP */
Use __maybe_unused may be more clear with SIMPLE_DEV_PM_OPS.
> +
> +static SIMPLE_DEV_PM_OPS(cv180x_thermal_pm_ops,
> + cv180x_thermal_suspend, cv180x_thermal_resume);
> +
> +static struct platform_driver cv180x_thermal_driver = {
> + .probe = cv180x_thermal_probe,
> + .remove = cv180x_thermal_remove,
> + .driver = {
> + .name = "cv180x-thermal",
> + .pm = &cv180x_thermal_pm_ops,
> + .of_match_table = cv180x_thermal_of_match,
> + },
> +};
> +
> +module_platform_driver(cv180x_thermal_driver);
> +
> +MODULE_AUTHOR("Haylen Chu <heylenay@...look.com>");
> +MODULE_LICENSE("GPL");
> --
> 2.45.1
>
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