diff options
| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2014-04-24 11:30:03 -0400 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2014-05-05 18:11:13 -0400 |
| commit | 92ea637edea36e58236e3124f199161da6f5c5de (patch) | |
| tree | 3d448091313a8f872a8e6bb7498c447350d801b8 /drivers/of | |
| parent | 18308c94723e162ed121942335bc186e66820a7a (diff) | |
of: introduce of_dma_is_coherent() helper
The of_dma_is_coherent() helper parses the given DT device
node to see if the "dma-coherent" property is supported and
returns true or false accordingly.
If the arch is always coherent or always noncoherent, then the default
DMA ops has to be specified accordingly.
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Olof Johansson <olof@lixom.net>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Diffstat (limited to 'drivers/of')
| -rw-r--r-- | drivers/of/address.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/of/address.c b/drivers/of/address.c index c54baee87d93..d244b2859aac 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c | |||
| @@ -808,3 +808,26 @@ out: | |||
| 808 | return ret; | 808 | return ret; |
| 809 | } | 809 | } |
| 810 | EXPORT_SYMBOL_GPL(of_dma_get_range); | 810 | EXPORT_SYMBOL_GPL(of_dma_get_range); |
| 811 | |||
| 812 | /** | ||
| 813 | * of_dma_is_coherent - Check if device is coherent | ||
| 814 | * @np: device node | ||
| 815 | * | ||
| 816 | * It returns true if "dma-coherent" property was found | ||
| 817 | * for this device in DT. | ||
| 818 | */ | ||
| 819 | bool of_dma_is_coherent(struct device_node *np) | ||
| 820 | { | ||
| 821 | struct device_node *node = of_node_get(np); | ||
| 822 | |||
| 823 | while (node) { | ||
| 824 | if (of_property_read_bool(node, "dma-coherent")) { | ||
| 825 | of_node_put(node); | ||
| 826 | return true; | ||
| 827 | } | ||
| 828 | node = of_get_next_parent(node); | ||
| 829 | } | ||
| 830 | of_node_put(node); | ||
| 831 | return false; | ||
| 832 | } | ||
| 833 | EXPORT_SYMBOL_GPL(of_dma_is_coherent); \ No newline at end of file | ||