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Thu, 25 Jan 2024 08:44:08 -0800 (PST) From: Alexandru Elisei To: catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, david@redhat.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Subject: [PATCH RFC v3 15/35] of: fdt: Add of_flat_read_u32() Date: Thu, 25 Jan 2024 16:42:36 +0000 Message-Id: <20240125164256.4147-16-alexandru.elisei@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240125164256.4147-1-alexandru.elisei@arm.com> References: <20240125164256.4147-1-alexandru.elisei@arm.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 787EB40002 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: 6a3be688gu5ekh8qrsgbpfq8xy8kpwy4 X-HE-Tag: 1706201054-599783 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add the function of_flat_read_u32() to return the value of a property as an u32. Signed-off-by: Alexandru Elisei --- Changes since rfc v2: * New patch, suggested by Rob Herring. drivers/of/fdt.c | 21 +++++++++++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 23 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index bf502ba8da95..dfcd79fd5fd9 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -755,6 +755,27 @@ const void *__init of_get_flat_dt_prop(unsigned long node, const char *name, return fdt_getprop(initial_boot_params, node, name, size); } +/* + * of_flat_read_u32 - Return the value of the given property as an u32. + * + * @node: device node from which the property value is to be read + * @propname: name of the property + * @out_value: the value of the property + * @return: 0 on success, -EINVAL if property does not exist + */ +int __init of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value) +{ + const __be32 *reg; + + reg = of_get_flat_dt_prop(node, propname, NULL); + if (!reg) + return -EINVAL; + + *out_value = be32_to_cpup(reg); + return 0; +} + /** * of_fdt_is_compatible - Return true if given node from the given blob has * compat in its compatible list diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 0e26f8c3b10e..d7901699061b 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -57,6 +57,8 @@ extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, extern int of_flat_dt_is_compatible(unsigned long node, const char *name); extern unsigned long of_get_flat_dt_root(void); extern uint32_t of_get_flat_dt_phandle(unsigned long node); +extern int of_flat_read_u32(unsigned long node, const char *propname, + u32 *out_value); extern int early_init_dt_scan_chosen(char *cmdline); extern int early_init_dt_scan_memory(void);