test: dm: add a test for MDIO MUX DM uclass

Adds a test using a makeshift MDIO MUX.  The test is based on the existing
MDIO test.  It uses the last emulated PHY register to verify MUX selection.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>

2 files changed, 81 insertions, 0 deletions

diff --git a/test/dm/Makefile b/test/dm/Makefile
index 6a36cc0a328..7b4dd6e12e6 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -63,4 +63,5 @@ obj-$(CONFIG_TEE) += tee.o
 obj-$(CONFIG_VIRTIO_SANDBOX) += virtio.o
 obj-$(CONFIG_DMA) += dma.o
 obj-$(CONFIG_DM_MDIO) += mdio.o
+obj-$(CONFIG_DM_MDIO_MUX) += mdio_mux.o
 endif
diff --git a/test/dm/mdio_mux.c b/test/dm/mdio_mux.c
new file mode 100644
index 00000000000..f962e09dbc2
--- /dev/null
+++ b/test/dm/mdio_mux.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019
+ * Alex Marginean, NXP
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/test.h>
+#include <misc.h>
+#include <test/ut.h>
+#include <miiphy.h>
+
+/* macros copied over from mdio_sandbox.c */
+#define SANDBOX_PHY_ADDR	5
+#define SANDBOX_PHY_REG_CNT	2
+
+#define TEST_REG_VALUE		0xabcd
+
+static int dm_test_mdio_mux(struct unit_test_state *uts)
+{
+	struct uclass *uc;
+	struct udevice *mux;
+	struct udevice *mdio_ch0, *mdio_ch1, *mdio;
+	struct mdio_ops *ops, *ops_parent;
+	struct mdio_mux_ops *mmops;
+	u16 reg;
+
+	ut_assertok(uclass_get(UCLASS_MDIO_MUX, &uc));
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_MDIO_MUX, "mdio-mux-test",
+					      &mux));
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-ch-test@0",
+					      &mdio_ch0));
+	ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-ch-test@1",
+					      &mdio_ch1));
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-test", &mdio));
+
+	ops = mdio_get_ops(mdio_ch0);
+	ut_assertnonnull(ops);
+	ut_assertnonnull(ops->read);
+	ut_assertnonnull(ops->write);
+
+	mmops = mdio_mux_get_ops(mux);
+	ut_assertnonnull(mmops);
+	ut_assertnonnull(mmops->select);
+
+	ops_parent = mdio_get_ops(mdio);
+	ut_assertnonnull(ops);
+	ut_assertnonnull(ops->read);
+
+	/*
+	 * mux driver sets last register on the emulated PHY whenever a group
+	 * is selected to the selection #.  Just reading that register from
+	 * either of the child buses should return the id of the child bus
+	 */
+	reg = ops->read(mdio_ch0, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
+			SANDBOX_PHY_REG_CNT - 1);
+	ut_asserteq(reg, 0);
+
+	reg = ops->read(mdio_ch1, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
+			SANDBOX_PHY_REG_CNT - 1);
+	ut_asserteq(reg, 1);
+
+	mmops->select(mux, MDIO_MUX_SELECT_NONE, 5);
+	reg = ops_parent->read(mdio, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
+			SANDBOX_PHY_REG_CNT - 1);
+	ut_asserteq(reg, 5);
+
+	mmops->deselect(mux, 5);
+	reg = ops_parent->read(mdio, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
+			SANDBOX_PHY_REG_CNT - 1);
+	ut_asserteq(reg, (u16)MDIO_MUX_SELECT_NONE);
+
+	return 0;
+}
+
+DM_TEST(dm_test_mdio_mux, DM_TESTF_SCAN_FDT);