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Message-ID:
 <MA0P287MB28221B0A8EF6F853D8B871E2FE862@MA0P287MB2822.INDP287.PROD.OUTLOOK.COM>
Date: Tue, 13 Aug 2024 09:39:42 +0800
From: Chen Wang <unicorn_wang@...look.com>
To: Thomas Bonnefille <thomas.bonnefille@...tlin.com>,
 Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen <lars@...afoo.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Inochi Amaoto <inochiama@...look.com>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Miquèl Raynal <miquel.raynal@...tlin.com>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 2/3] iio: adc: sophgo-saradc: Add driver for Sophgo
 CV18XX series SARADC


On 2024/8/12 23:00, Thomas Bonnefille wrote:
> This adds a driver for the common Sophgo SARADC.
Not common. Please double check the whole patchset.
>
> Signed-off-by: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> ---
>   drivers/iio/adc/Kconfig             |  10 ++
>   drivers/iio/adc/Makefile            |   1 +
>   drivers/iio/adc/sophgo-cv18xx-adc.c | 208 ++++++++++++++++++++++++++++++++++++
>   3 files changed, 219 insertions(+)
>
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index f60fe85a30d5..b10bf26d8e86 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -1156,6 +1156,16 @@ config SC27XX_ADC
>   	  This driver can also be built as a module. If so, the module
>   	  will be called sc27xx_adc.
>   
> +config SOPHGO_CV18XX_ADC
> +	tristate "Sophgo CV18XX series SARADC"
> +	depends on ARCH_SOPHGO || COMPILE_TEST
> +	help
> +	  Say yes here to build support for the SARADC integrated inside
> +	  the Sophgo CV18XX series SoCs.
> +
> +	  This driver can also be built as a module. If so, the module
> +	  will be called sophgo_cv18xx_adc.
> +
>   config SPEAR_ADC
>   	tristate "ST SPEAr ADC"
>   	depends on PLAT_SPEAR || COMPILE_TEST
> diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> index d370e066544e..24c241b12ef0 100644
> --- a/drivers/iio/adc/Makefile
> +++ b/drivers/iio/adc/Makefile
> @@ -105,6 +105,7 @@ obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
>   obj-$(CONFIG_RZG2L_ADC) += rzg2l_adc.o
>   obj-$(CONFIG_SC27XX_ADC) += sc27xx_adc.o
>   obj-$(CONFIG_SD_ADC_MODULATOR) += sd_adc_modulator.o
> +obj-$(CONFIG_SOPHGO_CV18XX_ADC) += sophgo-cv18xx-adc.o
>   obj-$(CONFIG_SPEAR_ADC) += spear_adc.o
>   obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
>   obj-$(CONFIG_STM32_ADC) += stm32-adc.o
> diff --git a/drivers/iio/adc/sophgo-cv18xx-adc.c b/drivers/iio/adc/sophgo-cv18xx-adc.c
> new file mode 100644
> index 000000000000..ab7ee0f482cc
> --- /dev/null
> +++ b/drivers/iio/adc/sophgo-cv18xx-adc.c
> @@ -0,0 +1,208 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + *  Sophgo CV18XX series SARADC Driver
> + *
> + *  Copyright (C) Bootlin 2024
> + *  Author: Thomas Bonnefille <thomas.bonnefille@...tlin.com>
> + */
> +
> +#include "linux/err.h"
<linux/err.h> ? And please sort with the file name alphabeta.
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/completion.h>
> +#include <linux/dev_printk.h>
> +#include <linux/interrupt.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iopoll.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/platform_device.h>
> +
> +#define CV18XX_ADC_CTRL_REG				0x04
> +#define		CV18XX_ADC_EN				BIT(0)

Should be one space between "#define" and macro-name. Please check this 
for the whole file.

Run "./scripts/checkpatch.pl --strict" if it can help you check this 
format error?

> +#define		CV18XX_ADC_SEL(x)			BIT((x) + 5)
> +#define CV18XX_ADC_STATUS_REG				0x08
> +#define		CV18XX_ADC_BUSY				BIT(0)
> +#define CV18XX_ADC_CYC_SET_REG				0x0C
> +/* The default cycle configuration is set to maximize the accuracy */
> +#define		CV18XX_ADC_DEF_STARTUP_CYCLE_MASK	0x1F
> +#define		CV18XX_ADC_DEF_SAMPLE_WINDOW_MASK	0xF00
> +#define		CV18XX_ADC_DEF_CLOCK_DIVIDER_MASK	0xF000
> +#define		CV18XX_ADC_DEF_COMPARE_CYCLE_MASK	0xF0000
> +#define CV18XX_ADC_CH_RESULT_REG(x)			(0x14 + 4 * (x))
> +#define		CV18XX_ADC_CH_RESULT			GENMASK(11, 0)
> +#define		CV18XX_ADC_CH_VALID			BIT(15)
> +#define CV18XX_ADC_INTR_EN_REG				0x20
> +#define CV18XX_ADC_INTR_CLR_REG				0x24
> +#define		CV18XX_ADC_INTR_CLR_BIT			BIT(0)
> +#define CV18XX_ADC_INTR_STA_REG				0x28
> +#define		CV18XX_ADC_INTR_STA_BIT			BIT(0)
> +
> +#define CV18XX_ADC_CHANNEL(index)					\
> +	{								\
> +		.type = IIO_VOLTAGE,					\
> +		.indexed = 1,						\
> +		.channel = index,					\
> +		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
> +		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
> +		.scan_index = index,					\
> +	}
> +
> +struct cv18xx_adc {
> +	struct completion completion;
> +	void __iomem *regs;
> +	struct mutex lock; /* ADC Control and Result register */
> +	int irq;
> +};
> +
> +static const struct iio_chan_spec sophgo_channels[] = {
> +	CV18XX_ADC_CHANNEL(0),
> +	CV18XX_ADC_CHANNEL(1),
> +	CV18XX_ADC_CHANNEL(2),
> +};
> +
> +static void cv18xx_adc_start_measurement(struct cv18xx_adc *saradc,
> +					    int channel)
> +{
> +	writel(0, saradc->regs + CV18XX_ADC_CTRL_REG);
> +	writel(CV18XX_ADC_SEL(channel) | CV18XX_ADC_EN,
> +	       saradc->regs + CV18XX_ADC_CTRL_REG);
> +}
> +
> +static int cv18xx_adc_wait(struct cv18xx_adc *saradc)
> +{
> +	if (saradc->irq < 0) {
> +		u32 reg;
> +
> +		return readl_poll_timeout(saradc->regs + CV18XX_ADC_STATUS_REG,
> +					  reg, !(reg & CV18XX_ADC_BUSY),
> +					  500, 1000000);
> +	}
> +	return wait_for_completion_timeout(&saradc->completion,
> +					  msecs_to_jiffies(1000)) > 0
> +					  ? 0 : -ETIMEDOUT;
> +}
> +
> +static int cv18xx_adc_read_raw(struct iio_dev *indio_dev,
> +				  struct iio_chan_spec const *chan,
> +				  int *val, int *val2, long mask)
> +{
> +
> +	switch (mask) {
> +	case IIO_CHAN_INFO_RAW:{
> +		struct cv18xx_adc *saradc = iio_priv(indio_dev);
> +		u32 sample;
> +
> +		scoped_guard(mutex, &saradc->lock) {
> +			int ret;
> +
> +			cv18xx_adc_start_measurement(saradc, chan->scan_index);
> +			ret = cv18xx_adc_wait(saradc);
> +			if (ret < 0)
> +				return ret;
> +
> +			sample = readl(saradc->regs + CV18XX_ADC_CH_RESULT_REG(chan->scan_index));
> +		}
> +		if (!(sample & CV18XX_ADC_CH_VALID))
> +			return -ENODATA;
> +
> +		*val = sample & CV18XX_ADC_CH_RESULT;
> +		return IIO_VAL_INT;
> +		}
> +	case IIO_CHAN_INFO_SCALE:
> +		*val = 3300;
> +		*val2 = 12;
> +		return IIO_VAL_FRACTIONAL_LOG2;
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static irqreturn_t cv18xx_adc_interrupt_handler(int irq, void *private)
> +{
> +	struct cv18xx_adc *saradc = private;
> +
> +	if (!(FIELD_GET(CV18XX_ADC_INTR_STA_BIT,
> +			readl(saradc->regs + CV18XX_ADC_INTR_STA_REG))))
> +		return IRQ_NONE;
> +
> +	writel(CV18XX_ADC_INTR_CLR_BIT, saradc->regs + CV18XX_ADC_INTR_CLR_REG);
> +	complete(&saradc->completion);
> +	return IRQ_HANDLED;
> +}
> +
> +static const struct iio_info cv18xx_adc_info = {
> +	.read_raw = &cv18xx_adc_read_raw,
> +};
> +
> +static int cv18xx_adc_probe(struct platform_device *pdev)
> +{
> +	struct cv18xx_adc *saradc;
> +	struct iio_dev *indio_dev;
> +	struct clk *clk;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*saradc));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	saradc = iio_priv(indio_dev);
> +	indio_dev->name = "sophgo-cv18xx-adc";
> +	indio_dev->modes = INDIO_DIRECT_MODE;
> +	indio_dev->info = &cv18xx_adc_info;
> +	indio_dev->num_channels = ARRAY_SIZE(sophgo_channels);
> +	indio_dev->channels = sophgo_channels;
> +
> +	clk = devm_clk_get_enabled(&pdev->dev, NULL);
> +	if (IS_ERR(clk))
> +		return PTR_ERR(clk);
> +
> +	saradc->regs = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(saradc->regs))
> +		return PTR_ERR(saradc->regs);
> +
> +	saradc->irq = platform_get_irq_optional(pdev, 0);
> +	if (saradc->irq >= 0) {
> +		init_completion(&saradc->completion);
> +		ret = devm_request_irq(&pdev->dev, saradc->irq,
> +				       cv18xx_adc_interrupt_handler, 0,
> +				       dev_name(&pdev->dev), saradc);
> +		if (ret)
> +			return ret;
> +
> +		writel(1, saradc->regs + CV18XX_ADC_INTR_EN_REG);
> +	}
> +
> +	ret = devm_mutex_init(&pdev->dev, &saradc->lock);
> +	if (ret)
> +		return ret;
> +
> +	platform_set_drvdata(pdev, indio_dev);
> +	writel(FIELD_PREP(CV18XX_ADC_DEF_STARTUP_CYCLE_MASK, 0xF) |
> +	       FIELD_PREP(CV18XX_ADC_DEF_SAMPLE_WINDOW_MASK, 0xF) |
> +	       FIELD_PREP(CV18XX_ADC_DEF_CLOCK_DIVIDER_MASK, 0x1) |
> +	       FIELD_PREP(CV18XX_ADC_DEF_COMPARE_CYCLE_MASK, 0xF),
> +	       saradc->regs + CV18XX_ADC_CYC_SET_REG);
> +
> +	return devm_iio_device_register(&pdev->dev, indio_dev);
> +}
> +
> +static const struct of_device_id cv18xx_adc_match[] = {
> +	{ .compatible = "sophgo,cv1800b-saradc", },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, cv18xx_adc_match);
> +
> +static struct platform_driver cv18xx_adc_driver = {
> +	.driver	= {
> +		.name		= "sophgo-cv18xx-saradc",
> +		.of_match_table	= cv18xx_adc_match,
> +	},
> +	.probe = cv18xx_adc_probe,
> +};
> +module_platform_driver(cv18xx_adc_driver);
> +
> +MODULE_AUTHOR("Thomas Bonnefille <thomas.bonnefille@...tlin.com>");
> +MODULE_DESCRIPTION("Sophgo CV18XX series SARADC driver");
> +MODULE_LICENSE("GPL");
>

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