lpc: phytium: Add LPC snoop driver

Documentation/devicetree/bindings/misc/phytium,lpc-snoop.yaml

@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/misc/phytium,lpc-snoop.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Phytium lpc-snoop
+
+maintainers:
+  - Lan Hengyu <[email protected]>
+
+description:
+        The LPC snoop interface allows the BMC to listen on and record the data
+        bytes written by the Host to the targeted LPC I/O pots.
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - phytium,lpc-snoop
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  snoop-ports:
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    description: The LPC I/O ports to snoop
+
+required:
+  - compatible
+  - interrupts
+  - snoop-ports
+
+examples:
+  - |
+          lpc: lpc@28010000 {
+                  compatible = "simple-mfd", "syscon";
+                  reg = <0x0 0x28010000 0x1000>;
+                  reg-io-width = <4>;
+
+                  #address-cells = <1>;
+                  #size-cells = <1>;
+                  ranges = <0x0 0x0 0x28010000 0x1000>;
+
+                lpc_snoop: lpc-snoop@90 {
+                    compatible = "phytium,lpc-snoop";
+                    reg = <0x90 0x8>;
+                    interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
+                    snoop-ports = <0x80>;
+                };
+          };

drivers/misc/Kconfig

@@ -104,6 +104,14 @@ config PHANTOM
 	  If you choose to build module, its name will be phantom. If unsure,
 	  say N here.
 
+config PHYTIUM_LPC_SNOOP
+        tristate "Phytium HOST LPC snoop support"
+        depends on ARCH_PHYTIUM && REGMAP && MFD_SYSCON
+        help
+          Provides a driver to control the LPC snoop interface which
+          allows the BMC to listen on and save the data written by
+          the host to an arbitrary LPC I/O port.
+
 config TIFM_CORE
 	tristate "TI Flash Media interface support"
 	depends on PCI

drivers/misc/Makefile

@@ -15,6 +15,7 @@ obj-$(CONFIG_LKDTM)		+= lkdtm/
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
 obj-$(CONFIG_PHANTOM)		+= phantom.o
+obj-$(CONFIG_PHYTIUM_LPC_SNOOP) += phytium-lpc-snoop.o
 obj-$(CONFIG_QCOM_COINCELL)	+= qcom-coincell.o
 obj-$(CONFIG_QCOM_FASTRPC)	+= fastrpc.o
 obj-$(CONFIG_SENSORS_BH1770)	+= bh1770glc.o