From patchwork Wed Oct 25 18:42:57 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 13436540 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EADDD1D69B for ; Wed, 25 Oct 2023 18:43:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="hpnolXxb" Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.24]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0B898DC; Wed, 25 Oct 2023 11:43:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1698259387; x=1729795387; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=T1sOH8MzD7ijqC2IX92sIk4YyeSEBbdujMf4a6IQTo0=; b=hpnolXxbUnhqliba/zRd5Kq7TqHBo9QG2rVe0DUEYI9NYknDTF8L9NhT w9UgrPaKeBzpIeKOFxNz/DyyN/UF+gG9VIjZXlXLOuVFLRz153x02Weuv ueBBRv5zvsEqrizUG+Izc8nk+cma87X5C8rXsNdXdnDWea1mWa9Ah1aVF SqPnwXn+wgQaIZuQnAHh5j5xcsj8qClexLf1NWbBDnjNXOrd8cwn8z10j vK2zIYYWHB6x/nbDM66W6qImUr9n8pb9+hKByZBtvonzIxv5wXBdyKJyC X+sPW0h/m6Y4y3MYXgGI3clFaM2yuNgHa5nS9G/vSYx7wI0rpzU6/dOd5 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10874"; a="390233006" X-IronPort-AV: E=Sophos;i="6.03,250,1694761200"; d="scan'208";a="390233006" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Oct 2023 11:43:06 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10874"; a="932458246" X-IronPort-AV: E=Sophos;i="6.03,250,1694761200"; d="scan'208";a="932458246" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga005.jf.intel.com with ESMTP; 25 Oct 2023 11:43:03 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id D2142FF; Wed, 25 Oct 2023 21:43:01 +0300 (EEST) From: Andy Shevchenko To: Andy Shevchenko , Greg Kroah-Hartman , linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Linus Walleij , Bartosz Golaszewski , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , "Rafael J. Wysocki" , Rob Herring Subject: [PATCH v1 1/3] device property: Implement device_is_big_endian() Date: Wed, 25 Oct 2023 21:42:57 +0300 Message-Id: <20231025184259.250588-2-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.40.0.1.gaa8946217a0b In-Reply-To: <20231025184259.250588-1-andriy.shevchenko@linux.intel.com> References: <20231025184259.250588-1-andriy.shevchenko@linux.intel.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Some users want to use the struct device pointer to see if the device is big endian in terms of Open Firmware specifications, i.e. if it has a "big-endian" property, or if the kernel was compiled for BE *and* the device has a "native-endian" property. Provide inline helper for the users. Signed-off-by: Andy Shevchenko Acked-by: Greg Kroah-Hartman --- include/linux/property.h | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/include/linux/property.h b/include/linux/property.h index 2b8f07fc68a9..d1400a477b0a 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -80,12 +80,38 @@ int fwnode_property_match_string(const struct fwnode_handle *fwnode, bool fwnode_device_is_available(const struct fwnode_handle *fwnode); +static inline bool fwnode_device_is_big_endian(const struct fwnode_handle *fwnode) +{ + if (fwnode_property_present(fwnode, "big-endian")) + return true; + if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN) && + fwnode_property_present(fwnode, "native-endian")) + return true; + return false; +} + static inline bool fwnode_device_is_compatible(const struct fwnode_handle *fwnode, const char *compat) { return fwnode_property_match_string(fwnode, "compatible", compat) >= 0; } +/** + * device_is_big_endian - check if a device has BE registers + * @dev: Pointer to the struct device + * + * Returns: true if the device has a "big-endian" property, or if the kernel + * was compiled for BE *and* the device has a "native-endian" property. + * Returns false otherwise. + * + * Callers would nominally use ioread32be/iowrite32be if + * device_is_big_endian() == true, or readl/writel otherwise. + */ +static inline bool device_is_big_endian(const struct device *dev) +{ + return fwnode_device_is_big_endian(dev_fwnode(dev)); +} + /** * device_is_compatible - match 'compatible' property of the device with a given string * @dev: Pointer to the struct device