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firmware: samsung: acpm: Add devm_acpm_get_by_phandle helper

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Introduce devm_acpm_get_by_phandle() to standardize how consumer
drivers acquire a handle to the ACPM IPC interface. Enforce the
use of the "samsung,acpm-ipc" property name across the SoC and
simplify the boilerplate code in client drivers.

The first consumer of this helper is the Exynos ACPM Thermal Management
Unit (TMU) driver. The TMU utilizes a hybrid management approach: direct
register access from the Application Processor (AP) is restricted to the
interrupt pending (INTPEND) registers for event identification.
High-level functional tasks, such as sensor initialization, threshold
programming, and temperature reads, are delegated to the ACPM firmware
via this IPC interface.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://patch.msgid.link/20260515-acpm-tmu-helpers-v2-6-8ca011d5a965@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
This commit is contained in:
Tudor Ambarus 2026-05-15 09:32:30 +00:00 committed by Krzysztof Kozlowski
parent 4ba23dfc49
commit fc13a4b9b9
2 changed files with 29 additions and 0 deletions
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23
drivers/firmware/samsung/exynos-acpm.c
View File

@ -853,6 +853,29 @@ struct acpm_handle *devm_acpm_get_by_node(struct device *dev,
}
EXPORT_SYMBOL_GPL(devm_acpm_get_by_node);
/**
* devm_acpm_get_by_phandle - Resource managed lookup of the standardized
* "samsung,acpm-ipc" handle.
* @dev: consumer device
*
* Return: pointer to handle on success, ERR_PTR(-errno) otherwise.
*/
struct acpm_handle *devm_acpm_get_by_phandle(struct device *dev)
{
struct acpm_handle *handle;
struct device_node *np;
np = of_parse_phandle(dev->of_node, "samsung,acpm-ipc", 0);
if (!np)
return ERR_PTR(-ENODEV);
handle = devm_acpm_get_by_node(dev, np);
of_node_put(np);
return handle;
}
EXPORT_SYMBOL_GPL(devm_acpm_get_by_phandle);
static const struct acpm_match_data acpm_gs101 = {
.initdata_base = ACPM_GS101_INITDATA_BASE,
.acpm_clk_dev_name = "gs101-acpm-clk",

6
include/linux/firmware/samsung/exynos-acpm-protocol.h
View File

@ -70,6 +70,7 @@ struct device;
#if IS_ENABLED(CONFIG_EXYNOS_ACPM_PROTOCOL)
struct acpm_handle *devm_acpm_get_by_node(struct device *dev,
struct device_node *np);
struct acpm_handle *devm_acpm_get_by_phandle(struct device *dev);
#else
static inline struct acpm_handle *devm_acpm_get_by_node(struct device *dev,
@ -77,6 +78,11 @@ static inline struct acpm_handle *devm_acpm_get_by_node(struct device *dev,
{
return NULL;
}
static inline struct acpm_handle *devm_acpm_get_by_phandle(struct device *dev)
{
return ERR_PTR(-ENODEV);
}
#endif
#endif /* __EXYNOS_ACPM_PROTOCOL_H */