Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932217AbaDXPbo (ORCPT ); Thu, 24 Apr 2014 11:31:44 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:49535 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754569AbaDXPbj (ORCPT ); Thu, 24 Apr 2014 11:31:39 -0400 From: Santosh Shilimkar To: CC: , , Santosh Shilimkar , Greg Kroah-Hartman , Russell King , Arnd Bergmann , Olof Johansson , Grant Likely , Rob Herring , Catalin Marinas , Linus Walleij , Grygorii Strashko Subject: [PATCH v3 3/7] of: introduce of_dma_is_coherent() helper Date: Thu, 24 Apr 2014 11:30:03 -0400 Message-ID: <1398353407-2345-4-git-send-email-santosh.shilimkar@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1398353407-2345-1-git-send-email-santosh.shilimkar@ti.com> References: <1398353407-2345-1-git-send-email-santosh.shilimkar@ti.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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. If the arch is always coherent or always noncoherent, then the default DMA ops has to be specified accordingly. Cc: Greg Kroah-Hartman Cc: Russell King Cc: Arnd Bergmann Cc: Olof Johansson Cc: Grant Likely Cc: Rob Herring Cc: Catalin Marinas Cc: Linus Walleij Signed-off-by: Santosh Shilimkar Signed-off-by: Grygorii Strashko --- drivers/of/platform.c | 23 +++++++++++++++++++++++ include/linux/of_platform.h | 6 ++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 404d1da..48de98f 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -485,4 +485,27 @@ int of_platform_populate(struct device_node *root, return rc; } EXPORT_SYMBOL_GPL(of_platform_populate); + +/** + * 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); #endif /* CONFIG_OF_ADDRESS */ diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h index 05cb4a9..b9a3cb2 100644 --- a/include/linux/of_platform.h +++ b/include/linux/of_platform.h @@ -72,6 +72,7 @@ extern int of_platform_populate(struct device_node *root, const struct of_device_id *matches, const struct of_dev_auxdata *lookup, struct device *parent); +extern bool of_dma_is_coherent(struct device_node *np); #else static inline int of_platform_populate(struct device_node *root, const struct of_device_id *matches, @@ -80,6 +81,11 @@ static inline int of_platform_populate(struct device_node *root, { return -ENODEV; } + +static inline bool of_dma_is_coherent(struct device_node *np) +{ + return false; +} #endif #endif /* _LINUX_OF_PLATFORM_H */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/