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spi: Add empty versions of ACPI lookup functions

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A patch from Richard Fitzgerald adding dummy versions of the ACPI lookup
 functions for SPI:
 
     Provide empty versions of acpi_spi_count_resources(),
     acpi_spi_device_alloc() and acpi_spi_find_controller_by_adev()
     if the real functions are not being built.
 
     This commit fixes two problems with the original definitions:
 
     1) There wasn't an empty version of these functions
     2) The #if only depended on CONFIG_ACPI. But the functions are implemented
        in the core spi.c so CONFIG_SPI_MASTER must also be enabled for the real
        functions to exist.
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Merge tag 'spi-acpi-lookup-dummy' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi into topic/cirrus-hp-g12

spi: Add empty versions of ACPI lookup functions

A patch from Richard Fitzgerald adding dummy versions of the ACPI lookup
functions for SPI:

    Provide empty versions of acpi_spi_count_resources(),
    acpi_spi_device_alloc() and acpi_spi_find_controller_by_adev()
    if the real functions are not being built.

    This commit fixes two problems with the original definitions:

    1) There wasn't an empty version of these functions
    2) The #if only depended on CONFIG_ACPI. But the functions are implemented
       in the core spi.c so CONFIG_SPI_MASTER must also be enabled for the real
       functions to exist.
This commit is contained in:
Takashi Iwai 2024-08-12 09:15:01 +02:00
commit 9219b179ba
1 changed files with 18 additions and 1 deletions
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19
include/linux/spi/spi.h
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@ -902,12 +902,29 @@ extern int devm_spi_register_controller(struct device *dev,
struct spi_controller *ctlr);
extern void spi_unregister_controller(struct spi_controller *ctlr);
#if IS_ENABLED(CONFIG_ACPI)
#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SPI_MASTER)
extern struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev);
extern struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
struct acpi_device *adev,
int index);
int acpi_spi_count_resources(struct acpi_device *adev);
#else
static inline struct spi_controller *acpi_spi_find_controller_by_adev(struct acpi_device *adev)
{
return NULL;
}
static inline struct spi_device *acpi_spi_device_alloc(struct spi_controller *ctlr,
struct acpi_device *adev,
int index)
{
return ERR_PTR(-ENODEV);
}
static inline int acpi_spi_count_resources(struct acpi_device *adev)
{
return 0;
}
#endif
/*