Add HMCAD15XX support and Sharkbyte board support

Documentation/devicetree/bindings/iio/adc/adi,hmcad15xx.yaml

@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright 2025 Analog Devices Inc.
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/adc/adi,hmcad15xx.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Analog Devices HMCAD15xx High-Speed ADC
+
+maintainers:
+  - Paul Pop <paul.pop@analog.com>
+
+description: |
+  The HMCAD1511 and HMCAD1520 are high-speed analog-to-digital converters
+  with LVDS outputs. The HMCAD1511 is a 12-bit ADC supporting up to 1 GSPS
+  in single-channel mode. The HMCAD1520 is a 14-bit ADC supporting up to
+  105 MSPS in quad-channel precision mode.
+
+  Both devices support flexible channel configurations:
+    - Single channel: highest sample rate
+    - Dual channel: half sample rate per channel
+    - Quad channel: quarter sample rate per channel
+
+  The driver supports 8-bit, 12-bit, and 14-bit resolution modes with
+  appropriate LVDS output configurations.
+
+  https://www.ti.com/product/HMCAD1511
+  https://www.ti.com/product/HMCAD1520
+
+properties:
+  compatible:
+    const: adi,hmcad15xx
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+    description:
+      ADC input clock. Maximum frequency depends on resolution and channel
+      configuration.
+
+  clock-names:
+    const: clk
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      Active low GPIO for hardware reset.
+
+  pd-gpios:
+    maxItems: 1
+    description:
+      Active high GPIO for power down control.
+
+  adi,num-channels:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1, 2, 4]
+    default: 1
+    description:
+      Number of ADC channels to enable. Affects sample rate per channel.
+
+  adi,resolution:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [8, 12, 14]
+    default: 8
+    description: |
+      ADC resolution in bits.
+        8-bit:  High-speed mode, up to 1000/500/250 MSPS for 1/2/4 channels
+        12-bit: Mid-speed mode, up to 660/330/165 MSPS for 1/2/4 channels
+        14-bit: Precision mode, dual 8-bit LVDS, up to 105 MSPS
+
+  adi,pol-mask:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    default: 0
+    description:
+      8-bit polarity mask for LVDS data lanes. Each bit controls the
+      polarity inversion of one LVDS lane. Used to compensate for PCB
+      routing constraints.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        adc@0 {
+            compatible = "adi,hmcad15xx";
+            reg = <0>;
+            clocks = <&adc_clk>;
+            clock-names = "clk";
+            reset-gpios = <&gpio0 87 GPIO_ACTIVE_LOW>;
+            pd-gpios = <&gpio0 86 GPIO_ACTIVE_HIGH>;
+            adi,num-channels = <1>;
+            adi,resolution = <12>;
+            adi,pol-mask = <239>;
+        };
+    };
+...

MAINTAINERS

@@ -10549,6 +10549,14 @@ F:	lib/test_hmm*
 F:	mm/hmm*
 F:	tools/testing/selftests/mm/*hmm*
 
+HMCAD15XX IIO ADC DRIVER
+M:	Paul Pop <paul.pop@analog.com>
+L:	linux-iio@vger.kernel.org
+S:	Supported
+W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/devicetree/bindings/iio/adc/adi,hmcad15xx.yaml
+F:	drivers/iio/adc/hmcad15xx.c
+
 HONEYWELL HSC030PA PRESSURE SENSOR SERIES IIO DRIVER
 M:	Petre Rodan <petre.rodan@subdimension.ro>
 L:	linux-iio@vger.kernel.org

drivers/iio/Kconfig.adi

@@ -94,6 +94,7 @@ config IIO_ALL_ADI_DRIVERS
 	imply AD8366
 	imply ADA4250
 	imply HMC425
+	imply HMCAD15XX
 	imply AD5270
 	imply AD5360
 	imply AD5380

drivers/iio/adc/Kconfig

@@ -902,6 +902,21 @@ config FSL_MX25_ADC
 	  Generic Conversion Queue driver used for general purpose ADC in the
 	  MX25. This driver supports single measurements using the MX25 ADC.
 
+config HMCAD15XX
+	tristate "Analog Devices HMCAD15XX ADC"
+	depends on SPI
+	select CF_AXI_ADC
+	help
+	  Say yes here to build support for Analog Devices HMCAD1511 and
+	  HMCAD1520 high-speed analog-to-digital converters with LVDS outputs.
+	  The HMCAD1511 is a 12-bit ADC supporting up to 1 GSPS in single-channel
+	  mode. The HMCAD1520 is a 14-bit ADC supporting up to 105 MSPS in
+	  quad-channel precision mode. Both devices support flexible 1/2/4
+	  channel configurations with 8-bit, 12-bit, or 14-bit resolution modes.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called hmcad15xx.
+
 config HI8435
 	tristate "Holt Integrated Circuits HI-8435 threshold detector"
 	select IIO_TRIGGERED_EVENT

drivers/iio/adc/Makefile

@@ -141,6 +141,7 @@ obj-$(CONFIG_ENVELOPE_DETECTOR) += envelope-detector.o
 obj-$(CONFIG_EP93XX_ADC) += ep93xx_adc.o
 obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o
 obj-$(CONFIG_FSL_MX25_ADC) += fsl-imx25-gcq.o
+obj-$(CONFIG_HMCAD15XX) += hmcad15xx.o
 obj-$(CONFIG_HI8435) += hi8435.o
 obj-$(CONFIG_HX711) += hx711.o
 obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o

drivers/iio/adc/cf_axi_adc.h

@@ -91,6 +91,9 @@
 #define ADI_DRP_RDATA(x)			(((x) & 0xFFFF) << 0)
 #define ADI_TO_DRP_RDATA(x)		(((x) >> 0) & 0xFFFF)
 
+#define ADI_REG_ADC_CONFIG_WR		0x0080
+#define ADI_REG_ADC_CONFIG_RD		0x0084
+
 #define ADI_REG_DMA_STATUS		0x0088
 #define ADI_DMA_OVF			(1 << 2)
 #define ADI_DMA_UNF			(1 << 1)