From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper Date: Thu, 27 Feb 2014 16:17:49 -0500 Message-ID: <1393535872-20915-5-git-send-email-santosh.shilimkar@ti.com> References: <1393535872-20915-1-git-send-email-santosh.shilimkar@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1393535872-20915-1-git-send-email-santosh.shilimkar-l0cyMroinI0@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: arnd-r2nGTMty4D4@public.gmane.org Cc: linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, magnus.damm-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, linus.walleij-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, Santosh Shilimkar , Russell King , Olof Johansson List-Id: devicetree@vger.kernel.org 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 Cc: Arnd Bergmann Cc: Olof Johansson Cc: Grant Likely Cc: Rob Herring Signed-off-by: Santosh Shilimkar --- 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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html From mboxrd@z Thu Jan 1 00:00:00 1970 From: santosh.shilimkar@ti.com (Santosh Shilimkar) Date: Thu, 27 Feb 2014 16:17:49 -0500 Subject: [PATCH v2 4/7] dma: of: introduce of_dma_is_coherent() helper In-Reply-To: <1393535872-20915-1-git-send-email-santosh.shilimkar@ti.com> References: <1393535872-20915-1-git-send-email-santosh.shilimkar@ti.com> Message-ID: <1393535872-20915-5-git-send-email-santosh.shilimkar@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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 Cc: Arnd Bergmann Cc: Olof Johansson Cc: Grant Likely Cc: Rob Herring Signed-off-by: Santosh Shilimkar --- 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