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dm: Add support for simple-pm-bus

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This type of bus is used in Linux to designate buses which have power
domains and/or clocks which need to be enabled before their child devices
can be used. Because power domains are automatically enabled before probing
in U-Boot, we just need to enable any clocks present.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Sean Anderson
2020-06-24 06:41:12 -04:00
committed by Andes
parent f9c7d4f99f
commit 4a3390f1d3
9 changed files with 162 additions and 0 deletions
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1
test/dm/Makefile
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@@ -74,4 +74,5 @@ obj-$(CONFIG_DM_MDIO) += mdio.o
obj-$(CONFIG_DM_MDIO_MUX) += mdio_mux.o
obj-$(CONFIG_DM_RNG) += rng.o
obj-$(CONFIG_CLK_K210_SET_RATE) += k210_pll.o
obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
endif

45
test/dm/simple-pm-bus.c Normal file
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@@ -0,0 +1,45 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
*/
#include <common.h>
#include <dm.h>
#include <dm/test.h>
#include <dm/device-internal.h>
#include <test/ut.h>
#include <asm/clk.h>
#include <asm/power-domain.h>
/* These must match the ids in the device tree */
#define TEST_CLOCK_ID 4
#define TEST_POWER_ID 1
static int dm_test_simple_pm_bus(struct unit_test_state *uts)
{
struct udevice *power;
struct udevice *clock;
struct udevice *bus;
ut_assertok(uclass_get_device_by_name(UCLASS_POWER_DOMAIN,
"power-domain", &power));
ut_assertok(uclass_get_device_by_name(UCLASS_CLK, "clk-sbox",
&clock));
ut_asserteq(0, sandbox_power_domain_query(power, TEST_POWER_ID));
ut_asserteq(0, sandbox_clk_query_enable(clock, TEST_CLOCK_ID));
ut_assertok(uclass_get_device_by_name(UCLASS_SIMPLE_BUS, "pm-bus-test",
&bus));
ut_asserteq(1, sandbox_power_domain_query(power, TEST_POWER_ID));
ut_asserteq(1, sandbox_clk_query_enable(clock, TEST_CLOCK_ID));
ut_assertok(device_remove(bus, DM_REMOVE_NORMAL));
/* must re-probe since device_remove also removes the power domain */
ut_assertok(uclass_get_device_by_name(UCLASS_POWER_DOMAIN,
"power-domain", &power));
ut_asserteq(0, sandbox_power_domain_query(power, TEST_POWER_ID));
ut_asserteq(0, sandbox_clk_query_enable(clock, TEST_CLOCK_ID));
return 0;
}
DM_TEST(dm_test_simple_pm_bus, DM_TESTF_SCAN_FDT);