[PATCH] ARM: rdu2: add command to reset network switch

[Lucas Stach <l.stach@pengutronix.de>]

This command allows to reset the network switch on the DEB,
clearing any DSA configuration, which may still be present from
a prior boot.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
 arch/arm/boards/zii-imx6q-rdu2/Makefile     |  2 +-
 arch/arm/boards/zii-imx6q-rdu2/switch-cmd.c | 49 +++++++++++++++++++++
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 arch/arm/boards/zii-imx6q-rdu2/switch-cmd.c

diff --git a/arch/arm/boards/zii-imx6q-rdu2/Makefile b/arch/arm/boards/zii-imx6q-rdu2/Makefile
index c6285362f2ee..10dfba3a3cf3 100644
--- a/arch/arm/boards/zii-imx6q-rdu2/Makefile
+++ b/arch/arm/boards/zii-imx6q-rdu2/Makefile
@@ -1,3 +1,3 @@
-obj-y += board.o
+obj-y += board.o switch-cmd.o
 lwl-y += lowlevel.o
 bbenv-y += defaultenv-rdu2
diff --git a/arch/arm/boards/zii-imx6q-rdu2/switch-cmd.c b/arch/arm/boards/zii-imx6q-rdu2/switch-cmd.c
new file mode 100644
index 000000000000..bdba46fb3615
--- /dev/null
+++ b/arch/arm/boards/zii-imx6q-rdu2/switch-cmd.c
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 Zodiac Inflight Innovation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#include <common.h>
+#include <command.h>
+#include <i2c/i2c.h>
+
+static int do_rave_switch_reset(int argc, char *argv[])
+{
+	struct i2c_client client;
+	u8 reg;
+
+	if (!of_machine_is_compatible("zii,imx6q-zii-rdu2") &&
+	    !of_machine_is_compatible("zii,imx6qp-zii-rdu2"))
+		return -ENODEV;
+
+	client.adapter = i2c_get_adapter(1);
+	if (!client.adapter)
+		return -ENODEV;
+
+	/* address of the switch watchdog microcontroller */
+	client.addr = 0x38;
+	reg = 0x78;
+	/* set switch reset time to 100ms */
+	i2c_write_reg(&client, 0x0a, &reg, 1);
+	/* reset the switch */
+	reg = 0x01;
+	i2c_write_reg(&client, 0x0d, &reg, 1);
+	/* issue dummy command to work around firmware bug */
+	i2c_read_reg(&client, 0x01, &reg, 1);
+
+	return 0;
+}
+
+BAREBOX_CMD_START(rave_reset_switch)
+	.cmd		= do_rave_switch_reset,
+	BAREBOX_CMD_DESC("reset ethernet switch on RDU2")
+	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
+BAREBOX_CMD_END
-- 
2.19.1


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