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drivers: clock_control: Add clock_fixed_rate driver

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Add fixed-clock clock control driver. This is a first step towards
making fixed-clocks a first-class citizen in the clock control
framework.

Since the change is hidden behind a Kconfig enable this is opt-in
for now.

Signed-off-by: Moritz Fischer <moritzf@google.com>
This commit is contained in:
Moritz Fischer 2022-06-09 12:27:44 -07:00 • committed by Carles Cufí
commit 28ed7f057d
9 changed files with 179 additions and 0 deletions
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9
tests/drivers/clock_control/fixed_clock/CMakeLists.txt Normal file
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# SPDX-License-Identifier: Apache-2.0
cmake_minimum_required(VERSION 3.20.0)
find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(fixed_clock)
FILE(GLOB app_sources src/*.c)
target_sources(app PRIVATE ${app_sources})

17
tests/drivers/clock_control/fixed_clock/app.overlay Normal file
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/*
* Copyright (c) 2022 Google, LLC
*
* SPDX-License-Identifier: Apache-2.0
*
*/
/ {
test {
test_fixed_rate_clk0: clk {
compatible = "fixed-clock";
clock-frequency = <100>;
#clock-cells = <0>;
};
};
};

4
tests/drivers/clock_control/fixed_clock/prj.conf Normal file
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CONFIG_ZTEST=y
CONFIG_ZTEST_NEW_API=y
CONFIG_CLOCK_CONTROL=y
CONFIG_CLOCK_CONTROL_FIXED_RATE_CLOCK=y

51
tests/drivers/clock_control/fixed_clock/src/test_clock_control.c Normal file
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/*
* Copyright (c) 2022 Google, LLC
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr/ztest.h>
#include <zephyr/drivers/clock_control.h>
#define TEST_FIXED_RATE_CLK0 DT_NODELABEL(test_fixed_rate_clk0)
#define TEST_FIXED_RATE_CLK0_RATE DT_PROP(TEST_FIXED_RATE_CLK0, clock_frequency)
/*
* Basic test for checking correctness of clock_api implementation
*/
ZTEST(fixed_clk, test_fixed_rate_clk_on_off_status_rate)
{
const struct device *dev = DEVICE_DT_GET(TEST_FIXED_RATE_CLK0);
enum clock_control_status status;
uint32_t rate;
int err;
zassert_equal(device_is_ready(dev), true, "%s: Device wasn't ready",
dev->name);
status = clock_control_get_status(dev, 0);
zassert_equal(status, CLOCK_CONTROL_STATUS_ON,
"%s: Unexpected status (%d)", dev->name, status);
err = clock_control_on(dev, 0);
zassert_equal(0, err, "%s: Unexpected err (%d)", dev->name, err);
status = clock_control_get_status(dev, 0);
zassert_equal(status, CLOCK_CONTROL_STATUS_ON,
"%s: Unexpected status (%d)", dev->name, status);
err = clock_control_off(dev, 0);
zassert_equal(0, err, "%s: Expected 0, got (%d)",
dev->name, err);
status = clock_control_get_status(dev, 0);
zassert_equal(status, CLOCK_CONTROL_STATUS_ON,
"%s: Unexpected status (%d)", dev->name, status);
err = clock_control_get_rate(dev, 0, &rate);
zassert_equal(0, err, "%s: Unexpected err (%d)", dev->name, err);
zassert_equal(TEST_FIXED_RATE_CLK0_RATE, rate,
"%s: Got wrong rate, expected %u, got %u\n",
dev->name, TEST_FIXED_RATE_CLK0_RATE, rate);
}
ZTEST_SUITE(fixed_clk, NULL, NULL, NULL, NULL, NULL);

7
tests/drivers/clock_control/fixed_clock/testcase.yaml Normal file
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tests:
drivers.clock.clock_control_fixed_clock:
tags:
- drivers
- clock
platform_allow:
- native_posix_64