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drivers: counter: add driver for Microchip MCP7940N RTCC

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Microchip MCP7940N is a Real-Time Clock/Calendar. It operates on a I2C
bus. It can be used to set a calendar time and has two alarm channels.
When an alarm is asserted the state of the MPF pin of the MCP7940N will
change (depending on gpio active high/active low setting) to trigger an
interrupt.

Signed-off-by: Kieran Mackey <kieran.mackey@lairdconnect.com>
This commit is contained in:
Kieran Mackey 2021-05-20 11:29:15 +01:00 • committed by Christopher Friedt
commit 94e006f0fc
6 changed files with 1012 additions and 0 deletions
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dts/bindings/rtc/microchip,mcp7940n.yaml Normal file
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#
# Copyright (c) 2021 Laird Connectivity
#
# SPDX-License-Identifier: Apache-2.0
#
description: Microchip MCP7940N I2C RTC
compatible: "microchip,mcp7940n"
include: i2c-device.yaml
properties:
reg:
required: true
int-gpios:
type: phandle-array
required: false
description: |
Host input connected to the MCP7940N MFP open drain output pin
Notifies when an alarm has triggered by asserting this line.