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clk: samsung: Extract parent clock enabling to common function

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Extract parent clock enabling from exynos_arm64_register_cmu() to
dedicated function.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20230307002423.24454-3-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
This commit is contained in:
Sam Protsenko 2023-03-06 18:24:22 -06:00 committed by Krzysztof Kozlowski
parent bed76f697a
commit 454e8d296c
1 changed files with 40 additions and 15 deletions
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55
drivers/clk/samsung/clk-exynos-arm64.c
View file

@ -56,6 +56,37 @@ static void __init exynos_arm64_init_clocks(struct device_node *np,
iounmap(reg_base);
}
/**
* exynos_arm64_enable_bus_clk - Enable parent clock of specified CMU
*
* @dev: Device object; may be NULL if this function is not being
* called from platform driver probe function
* @np: CMU device tree node
* @cmu: CMU data
*
* Keep CMU parent clock running (needed for CMU registers access).
*
* Return: 0 on success or a negative error code on failure.
*/
static int __init exynos_arm64_enable_bus_clk(struct device *dev,
struct device_node *np, const struct samsung_cmu_info *cmu)
{
struct clk *parent_clk;
if (!cmu->clk_name)
return 0;
if (dev)
parent_clk = clk_get(dev, cmu->clk_name);
else
parent_clk = of_clk_get_by_name(np, cmu->clk_name);
if (IS_ERR(parent_clk))
return PTR_ERR(parent_clk);
return clk_prepare_enable(parent_clk);
}
/**
* exynos_arm64_register_cmu - Register specified Exynos CMU domain
* @dev: Device object; may be NULL if this function is not being
@ -72,22 +103,16 @@ static void __init exynos_arm64_init_clocks(struct device_node *np,
void __init exynos_arm64_register_cmu(struct device *dev,
struct device_node *np, const struct samsung_cmu_info *cmu)
{
/* Keep CMU parent clock running (needed for CMU registers access) */
if (cmu->clk_name) {
struct clk *parent_clk;
int err;
if (dev)
parent_clk = clk_get(dev, cmu->clk_name);
else
parent_clk = of_clk_get_by_name(np, cmu->clk_name);
if (IS_ERR(parent_clk)) {
pr_err("%s: could not find bus clock %s; err = %ld\n",
__func__, cmu->clk_name, PTR_ERR(parent_clk));
} else {
clk_prepare_enable(parent_clk);
}
}
/*
* Try to boot even if the parent clock enablement fails, as it might be
* already enabled by bootloader.
*/
err = exynos_arm64_enable_bus_clk(dev, np, cmu);
if (err)
pr_err("%s: could not enable bus clock %s; err = %d\n",
__func__, cmu->clk_name, err);
exynos_arm64_init_clocks(np, cmu->clk_regs, cmu->nr_clk_regs);
samsung_cmu_register_one(np, cmu);