poweroff: add poweroff for mt6323 pmic

this adds poweroff to bananapi r2 / mt7623 / mt6323 pmic
Signed-off-by: NFrank Wunderlich <frank-w@public-files.de>

drivers/power/Kconfig

@@ -366,4 +366,11 @@ config TWL4030_POWER
 	The TWL4030 in a combination audio CODEC/power management with
 	GPIO and it is commonly used with the OMAP3 family of processors
 
+config POWER_MT6323
+	bool "Poweroff driver for mediatek mt6323"
+	select CMD_POWEROFF
+	help
+	  This adds poweroff driver for mt6323
+	  this pmic is used on mt7623 / Bananapi R2
+
 endmenu

drivers/power/Makefile

@@ -20,3 +20,4 @@ obj-$(CONFIG_DIALOG_POWER) += power_dialog.o
 obj-$(CONFIG_POWER_FSL) += power_fsl.o
 obj-$(CONFIG_POWER_I2C) += power_i2c.o
 obj-$(CONFIG_POWER_SPI) += power_spi.o
+obj-$(CONFIG_POWER_MT6323) += mt6323.o

drivers/power/mt6323.c

+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Frank Wunderlich <frank-w@public-files.de>
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+
+#define PWRAP_BASE		0x1000d000
+#define PWRAP_WACS2_CMD		0x9c
+
+#define PWRAP_CALC(adr, wdata) ((1 << 31) | (((adr) >> 1) << 16) | (wdata))
+
+#define MT6323_PWRC_BASE	0x8000
+#define RTC_BBPU		0x0000
+#define RTC_BBPU_KEY		(0x43 << 8)
+#define RTC_WRTGR		0x003c
+
+int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	u32 addr, val;
+
+	addr = PWRAP_BASE + PWRAP_WACS2_CMD;
+	val = PWRAP_CALC(MT6323_PWRC_BASE + RTC_BBPU, RTC_BBPU_KEY);
+	writel(val, addr);
+
+	mdelay(10);
+
+	val = PWRAP_CALC(MT6323_PWRC_BASE + RTC_WRTGR, 1);
+	writel(val, addr);
+
+	// wait some time and then print error
+	mdelay(10000);
+	printf("Failed to power off!!!\n");
+	return 1;
+}