linux-kernel - Re: [PATCH v3 07/14] software_node: Add support for fwnode

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Message-ID: <df4a5159-6d5e-3d4e-f164-3bd7c5e551eb@gmail.com>
Date:   Sat, 26 Dec 2020 23:47:37 +0000
From:   Daniel Scally <djrscally@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        devel@...ica.org, "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Yong Zhi <yong.zhi@...el.com>,
        Sakari Ailus <sakari.ailus@...ux.intel.com>,
        Bingbu Cao <bingbu.cao@...el.com>,
        Tian Shu Qiu <tian.shu.qiu@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        kieran.bingham+renesas@...asonboard.com,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Marco Felsch <m.felsch@...gutronix.de>,
        niklas.soderlund+renesas@...natech.se,
        Steve Longerbeam <slongerbeam@...il.com>,
        "Krogerus, Heikki" <heikki.krogerus@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH v3 07/14] software_node: Add support for fwnode_graph*()
 family of functions

Hi Andy

On 24/12/2020 12:24, Andy Shevchenko wrote:
> On Thu, Dec 24, 2020 at 3:14 AM Daniel Scally <djrscally@...il.com> wrote:
>>
>> From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
>>
>> This implements the remaining .graph_* callbacks in the
> 
> .graph_* ==> ->graph_*() ?
> 
>> fwnode operations structure for the software nodes. That makes
>> the fwnode_graph*() functions available in the drivers also
> 
> graph*() -> graph_*() ?

Both done.

>> 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 "port@0", "port@1",
> 
>> ...)
> 
> Looks not good, perhaps move to the previous line, or move port@1 example here?

Fixed - by expanding the lines to ~75 chars

> Few nitpicks here and there, after addressing them,
> Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>

Thank you!

>> +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))) {
>> +               /*
>> +                * ports have naming style "port@n", so we search for children
>> +                * that follow that convention (but without assuming anything
>> +                * about the index number)
>> +                */
> 
>> +               if (!strncmp(to_swnode(port)->node->name, "port@",
> 
> You may use here corresponding _FMT macro.

>> +static int
>> +software_node_graph_parse_endpoint(const struct fwnode_handle *fwnode,
>> +                                  struct fwnode_endpoint *endpoint)
>> +{
>> +       struct swnode *swnode = to_swnode(fwnode);
>> +       int ret;
>> +
>> +       /* Ports have naming style "port@n", we need to select the n */
> 
>> +       ret = kstrtou32(swnode->parent->node->name + FWNODE_GRAPH_PORT_NAME_PREFIX_LEN,
> 
> Maybe a temporary variable?
> 
>   unsigned int prefix_len = FWNODE_GRAPH_PORT_NAME_PREFIX_LEN;
>   ...
>   ret = kstrtou32(swnode->parent->node->name + prefix_len,


Both discussed after Laurent's reply I think.