linux/drivers/clk/clk-fractional-divider_test.c
Jeff Johnson 06abd441c0 clk: test: add missing MODULE_DESCRIPTION() macros
make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/clk/clk_test.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/clk/clk-gate_test.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/clk/clk-fractional-divider_test.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.

Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Link: https://lore.kernel.org/r/20240602-md-clk-test-v1-1-a6afd4793337@quicinc.com
[sboyd@kernel.org: Reword header and description]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2024-06-03 15:46:46 -07:00

149 lines
4.2 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Kunit tests for clk fractional divider
*/
#include <linux/clk-provider.h>
#include <kunit/test.h>
#include "clk-fractional-divider.h"
/*
* Test the maximum denominator case for fd clock without flags.
*
* Expect the highest possible denominator to be used in order to get as close as possible to the
* requested rate.
*/
static void clk_fd_test_approximation_max_denominator(struct kunit *test)
{
struct clk_fractional_divider *fd;
unsigned long rate, parent_rate, parent_rate_before, m, n, max_n;
fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, fd);
fd->mwidth = 3;
fd->nwidth = 3;
max_n = 7;
rate = 240000000;
parent_rate = (max_n + 1) * rate; /* so that it exceeds the maximum divisor */
parent_rate_before = parent_rate;
clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n);
KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before);
KUNIT_EXPECT_EQ(test, m, 1);
KUNIT_EXPECT_EQ(test, n, max_n);
}
/*
* Test the maximum numerator case for fd clock without flags.
*
* Expect the highest possible numerator to be used in order to get as close as possible to the
* requested rate.
*/
static void clk_fd_test_approximation_max_numerator(struct kunit *test)
{
struct clk_fractional_divider *fd;
unsigned long rate, parent_rate, parent_rate_before, m, n, max_m;
fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, fd);
fd->mwidth = 3;
max_m = 7;
fd->nwidth = 3;
rate = 240000000;
parent_rate = rate / (max_m + 1); /* so that it exceeds the maximum numerator */
parent_rate_before = parent_rate;
clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n);
KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before);
KUNIT_EXPECT_EQ(test, m, max_m);
KUNIT_EXPECT_EQ(test, n, 1);
}
/*
* Test the maximum denominator case for zero based fd clock.
*
* Expect the highest possible denominator to be used in order to get as close as possible to the
* requested rate.
*/
static void clk_fd_test_approximation_max_denominator_zero_based(struct kunit *test)
{
struct clk_fractional_divider *fd;
unsigned long rate, parent_rate, parent_rate_before, m, n, max_n;
fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, fd);
fd->flags = CLK_FRAC_DIVIDER_ZERO_BASED;
fd->mwidth = 3;
fd->nwidth = 3;
max_n = 8;
rate = 240000000;
parent_rate = (max_n + 1) * rate; /* so that it exceeds the maximum divisor */
parent_rate_before = parent_rate;
clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n);
KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before);
KUNIT_EXPECT_EQ(test, m, 1);
KUNIT_EXPECT_EQ(test, n, max_n);
}
/*
* Test the maximum numerator case for zero based fd clock.
*
* Expect the highest possible numerator to be used in order to get as close as possible to the
* requested rate.
*/
static void clk_fd_test_approximation_max_numerator_zero_based(struct kunit *test)
{
struct clk_fractional_divider *fd;
unsigned long rate, parent_rate, parent_rate_before, m, n, max_m;
fd = kunit_kzalloc(test, sizeof(*fd), GFP_KERNEL);
KUNIT_ASSERT_NOT_NULL(test, fd);
fd->flags = CLK_FRAC_DIVIDER_ZERO_BASED;
fd->mwidth = 3;
max_m = 8;
fd->nwidth = 3;
rate = 240000000;
parent_rate = rate / (max_m + 1); /* so that it exceeds the maximum numerator */
parent_rate_before = parent_rate;
clk_fractional_divider_general_approximation(&fd->hw, rate, &parent_rate, &m, &n);
KUNIT_ASSERT_EQ(test, parent_rate, parent_rate_before);
KUNIT_EXPECT_EQ(test, m, max_m);
KUNIT_EXPECT_EQ(test, n, 1);
}
static struct kunit_case clk_fd_approximation_test_cases[] = {
KUNIT_CASE(clk_fd_test_approximation_max_denominator),
KUNIT_CASE(clk_fd_test_approximation_max_numerator),
KUNIT_CASE(clk_fd_test_approximation_max_denominator_zero_based),
KUNIT_CASE(clk_fd_test_approximation_max_numerator_zero_based),
{}
};
/*
* Test suite for clk_fractional_divider_general_approximation().
*/
static struct kunit_suite clk_fd_approximation_suite = {
.name = "clk-fd-approximation",
.test_cases = clk_fd_approximation_test_cases,
};
kunit_test_suites(
&clk_fd_approximation_suite
);
MODULE_DESCRIPTION("Kunit tests for clk fractional divider");
MODULE_LICENSE("GPL");