Commit 757953f8 authored by Simon Xue's avatar Simon Xue Committed by Jonathan Cameron
Browse files

iio: adc: rockchip_saradc: Add support for RK3588 



Add new start and read functions to support rk3588 device.
Also, add a device compatible string for the same.

Signed-off-by: default avatarSimon Xue <xxm@rock-chips.com>
Signed-off-by: default avatarShreeya Patel <shreeya.patel@collabora.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: default avatarAngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230603185340.13838-3-shreeya.patel@collabora.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent fb1c13d5

drivers/iio/adc/rockchip_saradc.c

+70 −0
Original line number Diff line number Diff line
@@ -4,6 +4,7 @@ 
 * Copyright (C) 2014 ROCKCHIP, Inc.

 */



#include <linux/bitfield.h>

#include <linux/module.h>

#include <linux/mutex.h>

#include <linux/platform_device.h>
@@ -38,6 +39,22 @@ 
#define SARADC_TIMEOUT			msecs_to_jiffies(100)

#define SARADC_MAX_CHANNELS		8



/* v2 registers */

#define SARADC2_CONV_CON		0x000

#define SARADC_T_PD_SOC			0x004

#define SARADC_T_DAS_SOC		0x00c

#define SARADC2_END_INT_EN		0x104

#define SARADC2_ST_CON			0x108

#define SARADC2_STATUS			0x10c

#define SARADC2_END_INT_ST		0x110

#define SARADC2_DATA_BASE		0x120



#define SARADC2_EN_END_INT		BIT(0)

#define SARADC2_START			BIT(4)

#define SARADC2_SINGLE_MODE		BIT(5)



#define SARADC2_CONV_CHANNELS GENMASK(15, 0)



struct rockchip_saradc;



struct rockchip_saradc_data {
@@ -76,6 +93,25 @@ static void rockchip_saradc_start_v1(struct rockchip_saradc *info, int chn) 
	       SARADC_CTRL_IRQ_ENABLE, info->regs + SARADC_CTRL);

}



static void rockchip_saradc_start_v2(struct rockchip_saradc *info, int chn)

{

	int val;



	if (info->reset)

		rockchip_saradc_reset_controller(info->reset);



	writel_relaxed(0xc, info->regs + SARADC_T_DAS_SOC);

	writel_relaxed(0x20, info->regs + SARADC_T_PD_SOC);

	val = FIELD_PREP(SARADC2_EN_END_INT, 1);

	val |= val << 16;

	writel_relaxed(val, info->regs + SARADC2_END_INT_EN);

	val = FIELD_PREP(SARADC2_START, 1) |

	      FIELD_PREP(SARADC2_SINGLE_MODE, 1) |

	      FIELD_PREP(SARADC2_CONV_CHANNELS, chn);

	val |= val << 16;

	writel(val, info->regs + SARADC2_CONV_CON);

}



static void rockchip_saradc_start(struct rockchip_saradc *info, int chn)

{

	info->data->start(info, chn);
@@ -86,6 +122,18 @@ static int rockchip_saradc_read_v1(struct rockchip_saradc *info) 
	return readl_relaxed(info->regs + SARADC_DATA);

}



static int rockchip_saradc_read_v2(struct rockchip_saradc *info)

{

	int offset;



	/* Clear irq */

	writel_relaxed(0x1, info->regs + SARADC2_END_INT_ST);



	offset = SARADC2_DATA_BASE + info->last_chan->channel * 0x4;



	return readl_relaxed(info->regs + offset);

}



static int rockchip_saradc_read(struct rockchip_saradc *info)

{

	return info->data->read(info);
@@ -248,6 +296,25 @@ static const struct rockchip_saradc_data rk3568_saradc_data = { 
	.power_down = rockchip_saradc_power_down_v1,

};



static const struct iio_chan_spec rockchip_rk3588_saradc_iio_channels[] = {

	SARADC_CHANNEL(0, "adc0", 12),

	SARADC_CHANNEL(1, "adc1", 12),

	SARADC_CHANNEL(2, "adc2", 12),

	SARADC_CHANNEL(3, "adc3", 12),

	SARADC_CHANNEL(4, "adc4", 12),

	SARADC_CHANNEL(5, "adc5", 12),

	SARADC_CHANNEL(6, "adc6", 12),

	SARADC_CHANNEL(7, "adc7", 12),

};



static const struct rockchip_saradc_data rk3588_saradc_data = {

	.channels = rockchip_rk3588_saradc_iio_channels,

	.num_channels = ARRAY_SIZE(rockchip_rk3588_saradc_iio_channels),

	.clk_rate = 1000000,

	.start = rockchip_saradc_start_v2,

	.read = rockchip_saradc_read_v2,

};



static const struct of_device_id rockchip_saradc_match[] = {

	{

		.compatible = "rockchip,saradc",
@@ -261,6 +328,9 @@ static const struct of_device_id rockchip_saradc_match[] = { 
	}, {

		.compatible = "rockchip,rk3568-saradc",

		.data = &rk3568_saradc_data,

	}, {

		.compatible = "rockchip,rk3588-saradc",

		.data = &rk3588_saradc_data,

	},

	{},

};