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AJvYcCVhIQqHipE0cXBsoVkdM6t8TgOIP4zmklkKomWZg/dLn5sYTG80eGtmesmRXY6s6TYitmk/eSsNEsIb8M4mpaw=@lists.linux.dev X-Gm-Message-State: AOJu0YyuQN5N87GYYTQCRsW+TZuKJS6Rxz9IbuDmyH6pbNHql+T5LAh+ /tFmSQuGhEjmfMb5l32ICY0FinF/ZBHDDH7DCDouOsC9whv6aC2afIvaTga6mA== X-Google-Smtp-Source: AGHT+IF7NCaFQn5NI21IL8mvEhnYcnrMWrYJBC5MrY8umX2zBuXqZDWtQyZtz6v7uD5SvjxSxtithQ== X-Received: by 2002:a05:6a20:2d0b:b0:1cf:6dd7:fa50 with SMTP id adf61e73a8af0-1cf6dd7fa7cmr114263637.11.1726039705459; Wed, 11 Sep 2024 00:28:25 -0700 (PDT) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:8398:fe34:eba2:f301]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-71908fe4e7esm2399415b3a.80.2024.09.11.00.28.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Sep 2024 00:28:25 -0700 (PDT) From: Chen-Yu Tsai To: Rob Herring , Saravana Kannan , Matthias Brugger , AngeloGioacchino Del Regno , Wolfram Sang , Benson Leung , Tzung-Bi Shih , Mark Brown , Liam Girdwood Cc: Chen-Yu Tsai , chrome-platform@lists.linux.dev, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, Douglas Anderson , Johan Hovold , Jiri Kosina , Andy Shevchenko , linux-i2c@vger.kernel.org Subject: [PATCH v7 02/10] of: base: Add for_each_child_of_node_with_prefix() Date: Wed, 11 Sep 2024 15:27:40 +0800 Message-ID: <20240911072751.365361-3-wenst@chromium.org> X-Mailer: git-send-email 2.46.0.598.g6f2099f65c-goog In-Reply-To: <20240911072751.365361-1-wenst@chromium.org> References: <20240911072751.365361-1-wenst@chromium.org> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There are cases where drivers would go through child device nodes and operate on only the ones whose node name starts with a given prefix. Provide a helper for these users. This will mainly be used in a subsequent patch that implements a hardware component prober for I2C busses. Signed-off-by: Chen-Yu Tsai Reviewed-by: Rob Herring (Arm) --- Changes since v6: - Changed helper name to "for_each_child_of_node_with_prefix()" Changes since v5: - New patch --- drivers/of/base.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/of.h | 9 +++++++++ 2 files changed, 44 insertions(+) diff --git a/drivers/of/base.c b/drivers/of/base.c index 20603d3c9931..d3c123b3261a 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -628,6 +628,41 @@ struct device_node *of_get_next_child(const struct device_node *node, } EXPORT_SYMBOL(of_get_next_child); +/** + * of_get_next_child_with_prefix - Find the next child node with prefix + * @node: parent node + * @prev: previous child of the parent node, or NULL to get first + * + * This function is like of_get_next_child(), except that it automatically + * skips any nodes whose name doesn't have the given prefix. + * + * Return: A node pointer with refcount incremented, use + * of_node_put() on it when done. + */ +struct device_node *of_get_next_child_with_prefix(const struct device_node *node, + struct device_node *prev, + const char *prefix) +{ + struct device_node *next; + unsigned long flags; + + if (!node) + return NULL; + + raw_spin_lock_irqsave(&devtree_lock, flags); + next = prev ? prev->sibling : node->child; + for (; next; next = next->sibling) { + if (!of_node_name_prefix(next, prefix)) + continue; + if (of_node_get(next)) + break; + } + of_node_put(prev); + raw_spin_unlock_irqrestore(&devtree_lock, flags); + return next; +} +EXPORT_SYMBOL(of_get_next_child_with_prefix); + static struct device_node *of_get_next_status_child(const struct device_node *node, struct device_node *prev, bool (*checker)(const struct device_node *)) diff --git a/include/linux/of.h b/include/linux/of.h index 046283be1cd3..48cfb39197d6 100644 --- a/include/linux/of.h +++ b/include/linux/of.h @@ -289,6 +289,9 @@ extern struct device_node *of_get_parent(const struct device_node *node); extern struct device_node *of_get_next_parent(struct device_node *node); extern struct device_node *of_get_next_child(const struct device_node *node, struct device_node *prev); +extern struct device_node *of_get_next_child_with_prefix(const struct device_node *node, + struct device_node *prev, + const char *prefix); extern struct device_node *of_get_next_available_child( const struct device_node *node, struct device_node *prev); extern struct device_node *of_get_next_reserved_child( @@ -1468,6 +1471,12 @@ static inline int of_property_read_s32(const struct device_node *np, child != NULL; \ child = of_get_next_child(parent, child)) +#define for_each_child_of_node_with_prefix(parent, child, prefix) \ + for (struct device_node *child __free(device_node) = \ + of_get_next_child_with_prefix(parent, NULL, prefix); \ + child != NULL; \ + child = of_get_next_child_with_prefix(parent, child, prefix)) + #define for_each_available_child_of_node(parent, child) \ for (child = of_get_next_available_child(parent, NULL); child != NULL; \ child = of_get_next_available_child(parent, child))