From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 86265C64E8A for ; Mon, 30 Nov 2020 16:26:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 256ED206E3 for ; Mon, 30 Nov 2020 16:26:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="BRtt9fHW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728783AbgK3Q03 (ORCPT ); Mon, 30 Nov 2020 11:26:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37604 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725859AbgK3Q02 (ORCPT ); Mon, 30 Nov 2020 11:26:28 -0500 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 953CFC0613D4; Mon, 30 Nov 2020 08:25:48 -0800 (PST) Received: from pendragon.ideasonboard.com (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 9F07EB26; Mon, 30 Nov 2020 17:25:46 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1606753546; bh=UA/qkxUzYwRKqR3JG9I0EWqhjMCqRovfEci6PpvyszQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=BRtt9fHW35gc74uBEncfpTiuQfVpjt1QygOkT5Zk8l8ijokklL6WGy5Dcuv+Cz5ld JdPMTUWzPZSzf9XLr4hJ1nPSsAw1qdNd2ykpvQdtiOGs9210M2H9qVCBtoBQOj1/x3 4MjhMOBM8CSwuTUTdUiAY+ZWstdZO5tTJ9svyFGI= Date: Mon, 30 Nov 2020 18:25:38 +0200 From: Laurent Pinchart To: Daniel Scally Cc: linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-media@vger.kernel.org, devel@acpica.org, rjw@rjwysocki.net, lenb@kernel.org, gregkh@linuxfoundation.org, mika.westerberg@linux.intel.com, andriy.shevchenko@linux.intel.com, linus.walleij@linaro.org, bgolaszewski@baylibre.com, wsa@kernel.org, yong.zhi@intel.com, sakari.ailus@linux.intel.com, bingbu.cao@intel.com, tian.shu.qiu@intel.com, mchehab@kernel.org, robert.moore@intel.com, erik.kaneda@intel.com, pmladek@suse.com, rostedt@goodmis.org, sergey.senozhatsky@gmail.com, linux@rasmusvillemoes.dk, kieran.bingham+renesas@ideasonboard.com, jacopo+renesas@jmondi.org, laurent.pinchart+renesas@ideasonboard.com, jorhand@linux.microsoft.com, kitakar@gmail.com, heikki.krogerus@linux.intel.com Subject: Re: [PATCH 07/18] software_node: Add support for fwnode_graph*() family of functions Message-ID: <20201130162538.GK14465@pendragon.ideasonboard.com> References: <20201130133129.1024662-1-djrscally@gmail.com> <20201130133129.1024662-8-djrscally@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20201130133129.1024662-8-djrscally@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Daniel and Heikki, Thank you for the patch. On Mon, Nov 30, 2020 at 01:31:18PM +0000, Daniel Scally wrote: > From: Heikki Krogerus > > From: Heikki Krogerus > There seems to be one From: line too many. You can drop the one in the commit message, git-format-patch will add it automatically. > This implements the remaining .graph_* callbacks in the > fwnode operations vector for the software nodes. That makes s/vector/structure/ ? > the fwnode_graph*() functions available in the drivers also > when software nodes are used. > > The implementation tries to mimic the "OF graph" as much as > possible, but there is no support for the "reg" device > property. The ports will need to have the index in their > name which starts with "port" (for example "port0", "port1", > ...) and endpoints will use the index of the software node > that is given to them during creation. The port nodes can > also be grouped under a specially named "ports" subnode, > just like in DT, if necessary. I'm not very familiar with swnodes, but could we name ports port@n instead of portn to mimic OF nodes ? > The remote-endpoints are reference properties under the > endpoint nodes that are named "remote-endpoint". > > Signed-off-by: Heikki Krogerus > Co-developed-by: Daniel Scally > Signed-off-by: Daniel Scally > --- > changes since RFC v3: > - Simplified software_node_get_next_endpoint() a little > - Squared away references in software_node_get_next_endpoint() > and swnode_graph_find_next_port(), since they were affected by > the change to the earlier patch that had *get_next_child() also > put the previous reference. > - Dropped Andy's R-b, since the code changed. > changes in RFC v3: > - removed software_node_device_is_available > - moved the change to software_node_get_next_child to a separate > patch > - switched to use fwnode_handle_put() in graph_get_next_endpoint() > instead of software_node_put() > > changes in RFC v2: > - added software_node_device_is_available > - altered software_node_get_next_child to get references > - altered software_node_get_next_endpoint to release references > to ports and avoid passing invalid combinations of swnodes to > software_node_get_next_child > - altered swnode_graph_find_next_port to release port rather than > old > > drivers/base/swnode.c | 110 +++++++++++++++++++++++++++++++++++++++++- > 1 file changed, 109 insertions(+), 1 deletion(-) > > diff --git a/drivers/base/swnode.c b/drivers/base/swnode.c > index 9bd0bb77ad5b..0c7a8d6b9ea8 100644 > --- a/drivers/base/swnode.c > +++ b/drivers/base/swnode.c > @@ -540,6 +540,110 @@ software_node_get_reference_args(const struct fwnode_handle *fwnode, > return 0; > } > > +static struct fwnode_handle * > +swnode_graph_find_next_port(const struct fwnode_handle *parent, > + struct fwnode_handle *port) > +{ > + struct fwnode_handle *old = port; > + > + while ((port = software_node_get_next_child(parent, old))) { > + if (!strncmp(to_swnode(port)->node->name, "port", 4)) > + return port; > + old = port; > + } > + > + return NULL; > +} > + > +static struct fwnode_handle * > +software_node_graph_get_next_endpoint(const struct fwnode_handle *fwnode, > + struct fwnode_handle *endpoint) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + struct fwnode_handle *old = endpoint; > + struct fwnode_handle *parent; > + struct fwnode_handle *port; > + > + if (!swnode) > + return NULL; > + > + if (endpoint) { > + port = software_node_get_parent(endpoint); > + parent = software_node_get_parent(port); > + } else { > + parent = software_node_get_named_child_node(fwnode, "ports"); > + if (!parent) > + parent = software_node_get(&swnode->fwnode); > + > + port = swnode_graph_find_next_port(parent, NULL); > + } > + > + for (; port; port = swnode_graph_find_next_port(parent, port)) { > + endpoint = software_node_get_next_child(port, old); > + if (endpoint) { > + fwnode_handle_put(port); > + break; > + } > + > + /* No more endpoints for that port, so stop passing old */ > + old = NULL; > + } > + > + fwnode_handle_put(parent); > + > + return endpoint; > +} > + > +static struct fwnode_handle * > +software_node_graph_get_remote_endpoint(const struct fwnode_handle *fwnode) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + const struct software_node_ref_args *ref; > + const struct property_entry *prop; > + > + if (!swnode) > + return NULL; > + > + prop = property_entry_get(swnode->node->properties, "remote-endpoint"); > + if (!prop || prop->type != DEV_PROP_REF || prop->is_inline) > + return NULL; > + > + ref = prop->pointer; > + > + return software_node_get(software_node_fwnode(ref[0].node)); > +} > + > +static struct fwnode_handle * > +software_node_graph_get_port_parent(struct fwnode_handle *fwnode) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + struct fwnode_handle *parent; > + > + if (!strcmp(swnode->parent->node->name, "ports")) > + parent = &swnode->parent->parent->fwnode; > + else > + parent = &swnode->parent->fwnode; > + > + return software_node_get(parent); > +} > + > +static int > +software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode, > + struct fwnode_endpoint *endpoint) > +{ > + struct swnode *swnode = to_swnode(fwnode); > + int ret; > + > + ret = kstrtou32(swnode->parent->node->name + 4, 10, &endpoint->port); If we use port@, s/4/5/. But I suppose we also want to support the case where a single port is used, with its name set to "port" ? The logic would then need to be a tad more complex. Not sure if the consistency is worth the additional complexity, up to you. > + if (ret) > + return ret; > + > + endpoint->id = swnode->id; > + endpoint->local_fwnode = fwnode; > + > + return 0; > +} > + > static const struct fwnode_operations software_node_ops = { > .get = software_node_get, > .put = software_node_put, > @@ -551,7 +655,11 @@ static const struct fwnode_operations software_node_ops = { > .get_parent = software_node_get_parent, > .get_next_child_node = software_node_get_next_child, > .get_named_child_node = software_node_get_named_child_node, > - .get_reference_args = software_node_get_reference_args > + .get_reference_args = software_node_get_reference_args, > + .graph_get_next_endpoint = software_node_graph_get_next_endpoint, > + .graph_get_remote_endpoint = software_node_graph_get_remote_endpoint, > + .graph_get_port_parent = software_node_graph_get_port_parent, > + .graph_parse_endpoint = software_node_graph_parse_endpoint, > }; > > /* -------------------------------------------------------------------------- */ -- Regards, Laurent Pinchart