From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758672AbdCVDuV (ORCPT ); Tue, 21 Mar 2017 23:50:21 -0400 Received: from ozlabs.org ([103.22.144.67]:42809 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757425AbdCVDtl (ORCPT ); Tue, 21 Mar 2017 23:49:41 -0400 From: Alistair Popple To: mpe@ellerman.id.au Cc: robh+dt@kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, mhairgrove@nvidia.com, shailendras@nvidia.com, Alistair Popple Subject: [PATCH 1/3] drivers/of/base.c: Add of_property_read_u64_index Date: Wed, 22 Mar 2017 14:49:31 +1100 Message-Id: <1490154573-22475-1-git-send-email-alistair@popple.id.au> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There is of_property_read_u32_index but no u64 variant. This patch adds one similar to the u32 version for u64. Signed-off-by: Alistair Popple --- drivers/of/base.c | 31 +++++++++++++++++++++++++++++++ include/linux/of.h | 3 +++ 2 files changed, 34 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index d7c4629..0ea16bd 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1213,6 +1213,37 @@ int of_property_read_u32_index(const struct device_node *np, EXPORT_SYMBOL_GPL(of_property_read_u32_index); /** + * of_property_read_u64_index - Find and read a u64 from a multi-value property. + * + * @np: device node from which the property value is to be read. + * @propname: name of the property to be searched. + * @index: index of the u64 in the list of values + * @out_value: pointer to return value, modified only if no error. + * + * Search for a property in a device node and read nth 64-bit value from + * it. Returns 0 on success, -EINVAL if the property does not exist, + * -ENODATA if property does not have a value, and -EOVERFLOW if the + * property data isn't large enough. + * + * The out_value is modified only if a valid u64 value can be decoded. + */ +int of_property_read_u64_index(const struct device_node *np, + const char *propname, + u32 index, u64 *out_value) +{ + const u64 *val = of_find_property_value_of_size(np, propname, + ((index + 1) * sizeof(*out_value)), + 0, NULL); + + if (IS_ERR(val)) + return PTR_ERR(val); + + *out_value = be64_to_cpup(((__be64 *)val) + index); + return 0; +} +EXPORT_SYMBOL_GPL(of_property_read_u64_index); + +/** * of_property_read_variable_u8_array - Find and read an array of u8 from a * property, with bounds on the minimum and maximum array size. * diff --git a/include/linux/of.h b/include/linux/of.h index 21e6323..d08788d 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -292,6 +292,9 @@ extern int of_property_count_elems_of_size(const struct device_node *np, extern int of_property_read_u32_index(const struct device_node *np, const char *propname, u32 index, u32 *out_value); +extern int of_property_read_u64_index(const struct device_node *np, + const char *propname, + u32 index, u64 *out_value); extern int of_property_read_variable_u8_array(const struct device_node *np, const char *propname, u8 *out_values, size_t sz_min, size_t sz_max); -- 2.1.4