[PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper
From: Santosh Shilimkar <hidden>
Date: 2014-02-27 21:17:49
Also in:
linux-arm-kernel
Subsystem:
dma generic offload engine subsystem, open firmware and flattened device tree, the rest · Maintainers:
Vinod Koul, Rob Herring, Saravana Kannan, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2014-03-04 · Re: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper · Will Deacon <hidden>
- 2014-03-03 · Re: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper · Rob Herring <hidden>
- 2014-03-03 · Re: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper · Catalin Marinas <hidden>
- 2014-02-28 · Re: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper · Arnd Bergmann <hidden>
- 2014-02-28 · Re: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper · Santosh Shilimkar <hidden>
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. Cc: Russell King <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org> Cc: Arnd Bergmann <redacted> Cc: Olof Johansson <redacted> Cc: Grant Likely <redacted> Cc: Rob Herring <redacted> Signed-off-by: Santosh Shilimkar <redacted> --- drivers/dma/of-dma.c | 22 ++++++++++++++++++++++ include/linux/of_dma.h | 5 +++++ 2 files changed, 27 insertions(+)
diff --git a/drivers/dma/of-dma.c b/drivers/dma/of-dma.c
index 9b51768..c5958d1 100644
--- a/drivers/dma/of-dma.c
+++ b/drivers/dma/of-dma.c@@ -304,3 +304,25 @@ out: return ret; } EXPORT_SYMBOL_GPL(of_dma_get_range); + +/** + * of_dma_is_coherent - Check if device is coherent + * @np: device node + * + * It returns true if "dma-coherent" property was found + * for this device in DT. + */ +bool of_dma_is_coherent(struct device_node *np) +{ + struct device_node *node = np; + + while (node) { + if (of_property_read_bool(node, "dma-coherent")) { + of_node_put(node); + return true; + } + node = of_get_next_parent(node); + } + return false; +} +EXPORT_SYMBOL_GPL(of_dma_is_coherent);
diff --git a/include/linux/of_dma.h b/include/linux/of_dma.h
index f04171a..6191f02 100644
--- a/include/linux/of_dma.h
+++ b/include/linux/of_dma.h@@ -44,6 +44,7 @@ extern struct dma_chan *of_dma_simple_xlate(struct of_phandle_args *dma_spec, extern int of_dma_get_range(struct device_node *np, dma_addr_t *dma_addr, phys_addr_t *paddr, phys_addr_t *size); +extern bool of_dma_is_coherent(struct device_node *np); #else static inline int of_dma_controller_register(struct device_node *np, struct dma_chan *(*of_dma_xlate)
@@ -74,6 +75,10 @@ static inline int of_dma_get_range(struct device_node *np, dma_addr_t *dma_addr, { return -ENODEV; } +static inline bool of_dma_is_coherent(struct device_node *np) +{ + return false; +} #endif #endif /* __LINUX_OF_DMA_H */
--
1.7.9.5
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