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: Simon Xue <xxm@rock-chips.com>
Signed-off-by: Shreeya Patel <shreeya.patel@collabora.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230603185340.13838-3-shreeya.patel@collabora.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 21f9d92a6af4923a037cfd5fb4b8fde00143d0f6..257f0a80c08dd7d125eb11f1eb5d1f4864d8b4fc 100644 (file)
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -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,
        },
        {},
 };