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@@ -0,0 +1,80 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * (C) Copyright 2019
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+ * Alex Marginean, NXP
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <dm/test.h>
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+#include <misc.h>
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+#include <test/ut.h>
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+#include <miiphy.h>
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+
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+/* macros copied over from mdio_sandbox.c */
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+#define SANDBOX_PHY_ADDR 5
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+#define SANDBOX_PHY_REG_CNT 2
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+
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+#define TEST_REG_VALUE 0xabcd
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+
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+static int dm_test_mdio_mux(struct unit_test_state *uts)
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+{
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+ struct uclass *uc;
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+ struct udevice *mux;
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+ struct udevice *mdio_ch0, *mdio_ch1, *mdio;
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+ struct mdio_ops *ops, *ops_parent;
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+ struct mdio_mux_ops *mmops;
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+ u16 reg;
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+
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+ ut_assertok(uclass_get(UCLASS_MDIO_MUX, &uc));
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+
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+ ut_assertok(uclass_get_device_by_name(UCLASS_MDIO_MUX, "mdio-mux-test",
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+ &mux));
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+
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+ ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-ch-test@0",
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+ &mdio_ch0));
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+ ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-ch-test@1",
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+ &mdio_ch1));
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+
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+ ut_assertok(uclass_get_device_by_name(UCLASS_MDIO, "mdio-test", &mdio));
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+
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+ ops = mdio_get_ops(mdio_ch0);
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+ ut_assertnonnull(ops);
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+ ut_assertnonnull(ops->read);
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+ ut_assertnonnull(ops->write);
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+
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+ mmops = mdio_mux_get_ops(mux);
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+ ut_assertnonnull(mmops);
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+ ut_assertnonnull(mmops->select);
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+
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+ ops_parent = mdio_get_ops(mdio);
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+ ut_assertnonnull(ops);
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+ ut_assertnonnull(ops->read);
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+
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+ /*
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+ * mux driver sets last register on the emulated PHY whenever a group
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+ * is selected to the selection #. Just reading that register from
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+ * either of the child buses should return the id of the child bus
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+ */
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+ reg = ops->read(mdio_ch0, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
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+ SANDBOX_PHY_REG_CNT - 1);
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+ ut_asserteq(reg, 0);
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+
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+ reg = ops->read(mdio_ch1, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
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+ SANDBOX_PHY_REG_CNT - 1);
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+ ut_asserteq(reg, 1);
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+
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+ mmops->select(mux, MDIO_MUX_SELECT_NONE, 5);
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+ reg = ops_parent->read(mdio, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
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+ SANDBOX_PHY_REG_CNT - 1);
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+ ut_asserteq(reg, 5);
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+
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+ mmops->deselect(mux, 5);
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+ reg = ops_parent->read(mdio, SANDBOX_PHY_ADDR, MDIO_DEVAD_NONE,
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+ SANDBOX_PHY_REG_CNT - 1);
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+ ut_asserteq(reg, (u16)MDIO_MUX_SELECT_NONE);
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+
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+ return 0;
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+}
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+
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+DM_TEST(dm_test_mdio_mux, DM_TESTF_SCAN_FDT);
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