linux-kernel - [PATCH 2/4] iio: adc: rockchip_saradc: Add support for RK3528

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Message-ID: <20250227184058.2964204-3-jonas@kwiboo.se>
Date: Thu, 27 Feb 2025 18:40:51 +0000
From: Jonas Karlman <jonas@...boo.se>
To: Heiko Stuebner <heiko@...ech.de>,
	Jonathan Cameron <jic23@...nel.org>,
	Lars-Peter Clausen <lars@...afoo.de>
Cc: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Yao Zi <ziyao@...root.org>,
	linux-rockchip@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Jonas Karlman <jonas@...boo.se>
Subject: [PATCH 2/4] iio: adc: rockchip_saradc: Add support for RK3528

The Successive Approximation ADC (SARADC) in RK3528 uses the v2
controller and support:
- 10-bit resolution
- Up to 1MS/s sampling rate
- 4 single-ended input channels
- Current consumption: 0.5mA @ 1MS/s

Add support for the 4 channels of 10-bit resolution supported by SARADC
in RK3528.

Signed-off-by: Jonas Karlman <jonas@...boo.se>
---
 drivers/iio/adc/rockchip_saradc.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/iio/adc/rockchip_saradc.c b/drivers/iio/adc/rockchip_saradc.c
index a29e54754c8f..2619547d5d6f 100644
--- a/drivers/iio/adc/rockchip_saradc.c
+++ b/drivers/iio/adc/rockchip_saradc.c
@@ -275,6 +275,21 @@ static const struct rockchip_saradc_data rk3399_saradc_data = {
 	.power_down = rockchip_saradc_power_down_v1,
 };
 
+static const struct iio_chan_spec rockchip_rk3528_saradc_iio_channels[] = {
+	SARADC_CHANNEL(0, "adc0", 10),
+	SARADC_CHANNEL(1, "adc1", 10),
+	SARADC_CHANNEL(2, "adc2", 10),
+	SARADC_CHANNEL(3, "adc3", 10),
+};
+
+static const struct rockchip_saradc_data rk3528_saradc_data = {
+	.channels = rockchip_rk3528_saradc_iio_channels,
+	.num_channels = ARRAY_SIZE(rockchip_rk3528_saradc_iio_channels),
+	.clk_rate = 1000000,
+	.start = rockchip_saradc_start_v2,
+	.read = rockchip_saradc_read_v2,
+};
+
 static const struct iio_chan_spec rockchip_rk3568_saradc_iio_channels[] = {
 	SARADC_CHANNEL(0, "adc0", 10),
 	SARADC_CHANNEL(1, "adc1", 10),
@@ -324,6 +339,9 @@ static const struct of_device_id rockchip_saradc_match[] = {
 	}, {
 		.compatible = "rockchip,rk3399-saradc",
 		.data = &rk3399_saradc_data,
+	}, {
+		.compatible = "rockchip,rk3528-saradc",
+		.data = &rk3528_saradc_data,
 	}, {
 		.compatible = "rockchip,rk3568-saradc",
 		.data = &rk3568_saradc_data,
-- 
2.48.1