rtc: atcrtc100: Add driver for atcrtc100 RTC (torvalds#201)

RTC driver for atcrtc100 Real-Time Clock.

Signed-off-by: CL Wang <cl634@andestech.com>
Co-authored-by: CL Wang <cl634@andestech.com>
Reviewed-on: https://gitea.andestech.com/RD-SW/linux/pulls/201
Reviewed-by: randolph <randolph@andestech.com>
Reviewed-by: Tim Shih-Ting OuYang <tim609@andestech.com>

Author: 2 people

Documentation/devicetree/bindings/rtc/andestech,atcrtc100.yaml

@@ -0,0 +1,45 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/andestech,atcrtc100.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Andes ATCRTC100 Real-Time Clock
+
+maintainers:
+  - CL Wang <cl634@andestech.com>
+
+allOf:
+  - $ref: rtc.yaml#
+
+properties:
+  compatible:
+    enum:
+      - andestech,atcrtc100
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+    items:
+      - description: Periodic timekeeping interrupt
+      - description: RTC alarm interrupt
+
+  wakeup-source: true
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    rtc@f0300000 {
+        compatible = "andestech,atcrtc100";
+        reg = <0xf0300000 0x100>;
+        interrupts = <1>, <2>;
+        wakeup-source;
+    };

MAINTAINERS

@@ -3539,6 +3539,12 @@ F:	drivers/power/reset/atc260x-poweroff.c
 F:	drivers/regulator/atc260x-regulator.c
 F:	include/linux/mfd/atc260x/*
 
+ATCRTC100 RTC DRIVER
+M:	CL Wang <cl634@andestech.com>
+S:	Supported
+F:	Documentation/devicetree/bindings/rtc/andestech,atcrtc100.yaml
+F:	drivers/rtc/rtc-atcrtc100
+
 ATHEROS 71XX/9XXX GPIO DRIVER
 M:	Alban Bedel <albeu@free.fr>
 S:	Maintained

arch/riscv/configs/andes-support.config

@@ -29,3 +29,5 @@ CONFIG_FB_FTLCDC100=y
 CONFIG_PANEL_AUA036QN01=y
 CONFIG_FFB_MODE_RGB=y
 CONFIG_FFB_MODE_16BPP=y
+
+CONFIG_RTC_DRV_ATCRTC100=y

arch/riscv/configs/andes_defconfig

@@ -199,6 +199,17 @@ CONFIG_SND_VERBOSE_PROCFS=y
 CONFIG_SND_DRIVERS=y
 CONFIG_SND_HDA_PREALLOC_SIZE=64
 
+CONFIG_RTC_LIB=y
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_HCTOSYS=y
+CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
+CONFIG_RTC_SYSTOHC=y
+CONFIG_RTC_SYSTOHC_DEVICE="rtc0"
+CONFIG_RTC_NVMEM=y
+CONFIG_RTC_INTF_SYSFS=y
+CONFIG_RTC_INTF_PROC=y
+CONFIG_RTC_INTF_DEV=y
+
 CONFIG_ZSMALLOC=y
 CONFIG_ZRAM=y
 CONFIG_CRYPTO_LZO=y

drivers/rtc/Kconfig

@@ -1029,6 +1029,20 @@ config RTC_DRV_ALPHA
 	  Direct support for the real-time clock found on every Alpha
 	  system, specifically MC146818 compatibles.  If in doubt, say Y.
 
+config RTC_DRV_ATCRTC100
+	tristate "Andes ATCRTC100"
+	depends on RISCV
+	help
+	  If you say yes here you will get support for the Andes ATCRTC100
+	  RTC driver.
+
+	  This driver provides support for the Andes ATCRTC100 real-time clock
+	  device. It allows setting and retrieving the time and date, as well
+	  as setting alarms.
+
+	  To compile this driver as a module, choose M here: the module will
+	  be called rtc-atcrtc100.
+
 config RTC_DRV_DS1216
 	tristate "Dallas DS1216"
 	depends on SNI_RM

drivers/rtc/Makefile

@@ -32,6 +32,7 @@ obj-$(CONFIG_RTC_DRV_ASM9260)	+= rtc-asm9260.o
 obj-$(CONFIG_RTC_DRV_ASPEED)	+= rtc-aspeed.o
 obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
 obj-$(CONFIG_RTC_DRV_AT91SAM9)	+= rtc-at91sam9.o
+obj-$(CONFIG_RTC_DRV_ATCRTC100) += rtc-atcrtc100.o
 obj-$(CONFIG_RTC_DRV_AU1XXX)	+= rtc-au1xxx.o
 obj-$(CONFIG_RTC_DRV_BBNSM)	+= rtc-nxp-bbnsm.o
 obj-$(CONFIG_RTC_DRV_BD70528)	+= rtc-bd70528.o