linux-kernel - [PATCH v2 2/8] iio: adc: rockchip

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Message-Id: <20230525212712.255406-3-shreeya.patel@collabora.com>
Date:   Fri, 26 May 2023 02:57:06 +0530
From:   Shreeya Patel <shreeya.patel@...labora.com>
To:     jic23@...nel.org, lars@...afoo.de, heiko@...ech.de,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        sebastian.reichel@...labora.com
Cc:     linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel@...labora.com, gustavo.padovan@...labora.com,
        serge.broslavsky@...labora.com,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Simon Xue <xxm@...k-chips.com>
Subject: [PATCH v2 2/8] iio: adc: rockchip_saradc: Add support for RK3588

From: Simon Xue <xxm@...k-chips.com>

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@...k-chips.com>
Signed-off-by: Shreeya Patel <shreeya.patel@...labora.com>
---

Changes in v2
  - Add a from address.
  - Create separate patches for adding new device support and changes to
    the old device code.
  - Make use of FIELD_PREP.

 drivers/iio/adc/rockchip_saradc.c | 69 +++++++++++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index 21f9d92a6af4..31637440be83 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -38,6 +38,22 @@
 #define SARADC_TIMEOUT			msecs_to_jiffies(100)
 #define SARADC_MAX_CHANNELS		8
 
+/* v2 registers */
+#define SARADC2_CONV_CON		0x0
+#define SARADC_T_PD_SOC			0x4
+#define SARADC_T_DAS_SOC		0xc
+#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 +92,25 @@ 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 +121,18 @@ 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 +295,25 @@ 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 +327,9 @@ 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,
 	},
 	{},
 };
-- 
2.30.2