From nobody Tue Nov 26 17:36:43 2024 Received: from mail-pl1-f178.google.com (mail-pl1-f178.google.com [209.85.214.178]) (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 AAE0E1D90AD for ; Thu, 17 Oct 2024 09:42:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729158162; cv=none; b=MbT7Oj8gsu6fWi5ei3jyFIdEKN/DuyXJQeLWvaGUKdQ2mKOP+VxwtPzAKpTMgqjAirpiJRQmqBBPuj5W86MWKDTPHttzrZrU1px9vwpLaEK8NwX6OHcIdThZJtdaPOsGdXTQVZg5k/rqvG2qh742nSIYeoMIRrvq0xOaS16IXOo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729158162; c=relaxed/simple; bh=MId2xZZ81OybQFetgSsAykDpdl2QlAv0Pb4xxKayODU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pjmfmD2Tk+WkxDwi7U6rkwU4EldfNPwpqR9Nd+uiHmWdShzqa3CtS0GNufGHtaZLcdoPA3QYi+a3NHve/amsjHFfDNzzEZjzb6fKXJXxUFPDbnVn4PlpgWl62WIzbFR2fP4oNBfvA3/WK+mMnC7aoY3pok1cJyrUW3LO/h3LO0g= 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=ldccnPu9; arc=none smtp.client-ip=209.85.214.178 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="ldccnPu9" Received: by mail-pl1-f178.google.com with SMTP id d9443c01a7336-20c714cd9c8so7641845ad.0 for ; Thu, 17 Oct 2024 02:42:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1729158158; x=1729762958; 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=+HUfOP8BsCvd1B7O/Bwqytp/NnRsOmtEcRv5sfFy0Ao=; b=ldccnPu9KMs3kHBlPKt+c6CFvZmEU8IzFnjUPUD42ib+Tiqj1vHTZP/F0+HLLTDXRm 5dqQ+amC/LWbcsTF8ggxoReowkf8BMt+1RPbR8q84JOpRFH2ywqELz2IOTBhDZVUgNXm gyvRlUbThm63NerNH9LtV/nX8Gt2qyrx/nLwA= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729158158; x=1729762958; 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=+HUfOP8BsCvd1B7O/Bwqytp/NnRsOmtEcRv5sfFy0Ao=; b=SfoX09QLuUql+CSpEmycPs7kDt4wb/5Yq5VwsCWgQ2fC/LAKcFy1zHQx9iygoR8+vW o9R1UtP7zhM4Sn4bB/qFds6cnrJ/DYNeUpZY3/he5kASZWl9oNo3naSR2AVH0Bzu4ti6 cYMMR+wFNwxx+IavxvhweQQzC4IvdmJO68ZuwnFQ78FvjxWXmJERDkzhXGlp6Ril10GZ D6TbgmBCKTlha/hKWZoEcfH4Giej1sSY7Z8Nrck560Ot3LCHjZEEymAn2Ovp0XqR4xkz 3MMNbQkZs2So5tViPEFMUh3a5u7kyj+JQQrOrFWfbxsRc1Klo2KJZV6BhDm9Q8Q+p+vH ErSg== X-Forwarded-Encrypted: i=1; AJvYcCW9JfE34QfScQYA/bpXCvHuzjNcE9hJPYBcC1hqXNCXrB5clnPR8A7KnacHJnjA2cNIwJcRsR0+YTB4xcg=@vger.kernel.org X-Gm-Message-State: AOJu0Yz2DTFCs/4zG1CoW6W7Ou8Hy+T2ETIanodYhfqyw+oWBWn8BTri G8085pewXg3nEMDWDx59SSPicuH71M5mSc6GkL+fkSEKIoRPN3lxqdd2yCy1Fg== X-Google-Smtp-Source: AGHT+IHT4+zzl9R0Ike3MBwqQu0knSbe1bnofAe1pyh+O5dYhcMwxGAJD4ZqoWUDWmjDxZxoCRdzlw== X-Received: by 2002:a17:902:e84b:b0:20b:6f04:486a with SMTP id d9443c01a7336-20cbb1b931fmr278393475ad.35.1729158158169; Thu, 17 Oct 2024 02:42:38 -0700 (PDT) Received: from wenstp920.tpe.corp.google.com ([2401:fa00:1:10:fabb:a7ab:3d7:9aaa]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20d17f87ccasm40638655ad.62.2024.10.17.02.42.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 17 Oct 2024 02:42:37 -0700 (PDT) From: Chen-Yu Tsai To: Rob Herring , Saravana Kannan , Matthias Brugger , AngeloGioacchino Del Regno , Wolfram Sang , Benson Leung , Tzung-Bi Shih 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 v9 2/7] of: base: Add for_each_child_of_node_with_prefix() Date: Thu, 17 Oct 2024 17:34:37 +0800 Message-ID: <20241017094222.1014936-3-wenst@chromium.org> X-Mailer: git-send-email 2.47.0.rc1.288.g06298d1525-goog In-Reply-To: <20241017094222.1014936-1-wenst@chromium.org> References: <20241017094222.1014936-1-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 v7: - Collected Rob's Reviewed-by 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 d94efee4a7fc..a01e5534c2fd 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 d0307e3b093d..f921786cb8ac 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 2.47.0.rc1.288.g06298d1525-goog