From nobody Thu Sep 19 19:29:57 2024 Received: from mail-pf1-f176.google.com (mail-pf1-f176.google.com [209.85.210.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E673D13D635 for ; Wed, 11 Sep 2024 07:28:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726039707; cv=none; b=ug8neGK0nfTk4DewALcO8GxG94T85/mmOJ7GpyFNx1MUjhBhbo4wA1yncGJAazOvEOqfPtgWdiP1OPs1+UWgjmNvhal+S1fvM/CtQSDQ5+gU9qAUcsJ524iXKTIAKbg4SFFSfBuPEa5uZvO7Admido8seDE16Re88dE45zNdiOo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726039707; c=relaxed/simple; bh=WIfkiNtSKIwyx7GizcoCeKoQku6qSRlQSE16sb4sWRA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FhmWjrngPmJOgodlbn5xy3StdSz3vLrNGQQ/sQIWmzRWc8+htvyuZmuJW6IjZEjYC6H+TdFtAebIQY7UeoXARyL1vPyB9XrhraTXnCUZzgMcgYjU0lxx6CnJhcR+/3EFIC3C+CrVXJn5Cuq0RaJB+cLyVxz0EUpsMiFwEWBHgKA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=JOvuQXKv; arc=none smtp.client-ip=209.85.210.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="JOvuQXKv" Received: by mail-pf1-f176.google.com with SMTP id d2e1a72fcca58-718d6ad6050so4036228b3a.0 for ; Wed, 11 Sep 2024 00:28:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1726039705; x=1726644505; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=VHYuF087WkDWw6t01rd+JoBLqqCohsT20qRvxciVpzs=; b=JOvuQXKvQXdA+EWJKiDscgshBbTYFfQFZrP7j5E/nkmRN0mHQKkqeGnvJ51LE6RgwC tfUIGBOKOiAT1zl4G4mZYIbygfss5v2U8YC0YIk0KPTjZBZsrloa9tCApA1Az3m754Ss XprxpzgBZTJmzGKwVPg6omsQmi8zRXArGXRXE= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1726039705; x=1726644505; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=VHYuF087WkDWw6t01rd+JoBLqqCohsT20qRvxciVpzs=; b=NWGpdnPkahOHtS7eaa+x7SI83oyU6wokVokXlpb1MMuLr4ldbM6N+jVEy7BvWs0OZs BfLr9QkaKepYJI9g0pdjhoSmK7gcWIscy+r9BhkpZdPCXQACmE3NOYeyugZSlI7cQ8ei PQGzudJznkGbF5U4AHyXONPs7J4cskQ5QqNGacBPITaFAy/fTps+2dVHCZIXVMBNX1qJ AoOBoeMqj/JZIgtD51CQMb2kC9nfCzMs6oCvM+tU1wMOZK6neA81fbX6yoiuysDCBF2D lvAqPjWgrrYGRLmvf9nf56m/vaNSYmtYYIf0WLHxcvP7dlPhksgn+LnBlRfHyLpbV2kg bJFw== X-Forwarded-Encrypted: i=1; AJvYcCU+80acvzwxT13VrrTwBwgrLfst5QgIlrMTFRzJ5vpQchrYwOb1b1UJcK4I3lRe8Dt7051ornC32oMXlsY=@vger.kernel.org X-Gm-Message-State: AOJu0YxsYF7qPhKuj39a+Xk9cRZz8Kn3XRK3ex4Apdwk8+G575bOwYvA xTsKYJyfJTcQgEomPIVbM2pKCth/UbnK1gAqRvOcOSbP+ZuXx6D6rI+PXGQ4iw== 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: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 dev= ice_node *node, } EXPORT_SYMBOL(of_get_next_child); =20 +/** + * 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 =3D prev ? prev->sibling : node->child; + for (; next; next =3D 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_no= de *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 d= evice_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 *nod= e, struct device_node *prev); +extern struct device_node *of_get_next_child_with_prefix(const struct devi= ce_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 !=3D NULL; \ child =3D of_get_next_child(parent, child)) =20 +#define for_each_child_of_node_with_prefix(parent, child, prefix) \ + for (struct device_node *child __free(device_node) =3D \ + of_get_next_child_with_prefix(parent, NULL, prefix); \ + child !=3D NULL; \ + child =3D of_get_next_child_with_prefix(parent, child, prefix)) + #define for_each_available_child_of_node(parent, child) \ for (child =3D of_get_next_available_child(parent, NULL); child !=3D NULL= ; \ child =3D of_get_next_available_child(parent, child)) --=20 2.46.0.598.g6f2099f65c-goog