On Thursday 01 May 2014 08:56 PM, Rob Herring wrote: > On Thu, Apr 24, 2014 at 10:30 AM, Santosh Shilimkar > <[email protected]> wrote: >> 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 <[email protected]> >> Cc: Russell King <[email protected]> >> Cc: Arnd Bergmann <[email protected]> >> Cc: Olof Johansson <[email protected]> >> Cc: Grant Likely <[email protected]> >> Cc: Rob Herring <[email protected]> >> Cc: Catalin Marinas <[email protected]> >> Cc: Linus Walleij <[email protected]> >> Signed-off-by: Santosh Shilimkar <[email protected]> >> Signed-off-by: Grygorii Strashko <[email protected]> >> --- >> drivers/of/platform.c | 23 +++++++++++++++++++++++ >> include/linux/of_platform.h | 6 ++++++ > > I thought I said this already, but this does not belong in these files > as the function does not deal with platform devices. Probably > address.c/of_address.h would be the best place. > Updated patch with functions now moved to of_address.h/address.c
>From 08fb70715afe4adf203d24f1737dba7123c6713b Mon Sep 17 00:00:00 2001 From: Santosh Shilimkar <[email protected]> Date: Thu, 24 Apr 2014 11:30:03 -0400 Subject: [PATCH v3 3/7] 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 <[email protected]> Cc: Russell King <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Olof Johansson <[email protected]> Cc: Grant Likely <[email protected]> Cc: Rob Herring <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Linus Walleij <[email protected]> Signed-off-by: Santosh Shilimkar <[email protected]> Signed-off-by: Grygorii Strashko <[email protected]> --- drivers/of/address.c | 23 +++++++++++++++++++++++ include/linux/of_address.h | 6 ++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/of/address.c b/drivers/of/address.c index c54baee..d244b28 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -808,3 +808,26 @@ 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 = of_node_get(np); + + while (node) { + if (of_property_read_bool(node, "dma-coherent")) { + of_node_put(node); + return true; + } + node = of_get_next_parent(node); + } + of_node_put(node); + return false; +} +EXPORT_SYMBOL_GPL(of_dma_is_coherent); \ No newline at end of file diff --git a/include/linux/of_address.h b/include/linux/of_address.h index 4d7b325..839a352 100644 --- a/include/linux/of_address.h +++ b/include/linux/of_address.h @@ -65,6 +65,7 @@ extern struct of_pci_range *of_pci_range_parser_one( struct of_pci_range *range); extern int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size); +extern bool of_dma_is_coherent(struct device_node *np); #else /* CONFIG_OF_ADDRESS */ static inline struct device_node *of_find_matching_node_by_address( struct device_node *from, @@ -98,6 +99,11 @@ static inline int of_dma_get_range(struct device_node *np, u64 *dma_addr, { return -ENODEV; } + +static inline bool of_dma_is_coherent(struct device_node *np) +{ + return false; +} #endif /* CONFIG_OF_ADDRESS */ #ifdef CONFIG_OF -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
