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dmaengine: hsu: introduce stubs for the exported functions

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This allows UART drivers to register HSU DMA Engine without
being forced to use ifdefs.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2015-10-13 13:29:04 +03:00 • committed by Greg Kroah-Hartman
parent ec2f1b67f5
commit 47f82f1adf
1 changed files with 10 additions and 0 deletions
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10
include/linux/dma/hsu.h
View file

@ -38,11 +38,21 @@ struct hsu_dma_chip {
struct hsu_dma_platform_data *pdata; struct hsu_dma_platform_data *pdata;
}; };
#if IS_ENABLED(CONFIG_HSU_DMA)
/* Export to the internal users */ /* Export to the internal users */
irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr); irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip, unsigned short nr);
/* Export to the platform drivers */ /* Export to the platform drivers */
int hsu_dma_probe(struct hsu_dma_chip *chip); int hsu_dma_probe(struct hsu_dma_chip *chip);
int hsu_dma_remove(struct hsu_dma_chip *chip); int hsu_dma_remove(struct hsu_dma_chip *chip);
#else
static inline irqreturn_t hsu_dma_irq(struct hsu_dma_chip *chip,
unsigned short nr)
{
return IRQ_NONE;
}
static inline int hsu_dma_probe(struct hsu_dma_chip *chip) { return -ENODEV; }
static inline int hsu_dma_remove(struct hsu_dma_chip *chip) { return 0; }
#endif /* CONFIG_HSU_DMA */
#endif /* _DMA_HSU_H */ #endif /* _DMA_HSU_H */