netdev - Re: [PATCH net-next v6 10/17] net: pse-pd: Add support for PSE PIs

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Message-ID: <20240328103322.GX403975@kernel.org>
Date: Thu, 28 Mar 2024 10:33:22 +0000
From: Simon Horman <horms@...nel.org>
To: Kory Maincent <kory.maincent@...tlin.com>
Cc: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Jonathan Corbet <corbet@....net>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Russ Weight <russ.weight@...ux.dev>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Oleksij Rempel <o.rempel@...gutronix.de>,
	Mark Brown <broonie@...nel.org>,
	Frank Rowand <frowand.list@...il.com>, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, devicetree@...r.kernel.org,
	Dent Project <dentproject@...uxfoundation.org>
Subject: Re: [PATCH net-next v6 10/17] net: pse-pd: Add support for PSE PIs

On Tue, Mar 26, 2024 at 03:04:47PM +0100, Kory Maincent wrote:
> From: Kory Maincent (Dent Project) <kory.maincent@...tlin.com>
> 
> The Power Sourcing Equipment Power Interface (PSE PI) plays a pivotal role
> in the architecture of Power over Ethernet (PoE) systems. It is essentially
> a blueprint that outlines how one or multiple power sources are connected
> to the eight-pin modular jack, commonly known as the Ethernet RJ45 port.
> This connection scheme is crucial for enabling the delivery of power
> alongside data over Ethernet cables.
> 
> This patch adds support for getting the PSE controller node through PSE PI
> device subnode.
> 
> This supports adds a way to get the PSE PI id from the pse_pi devicetree
> subnode of a PSE controller node simply by reading the reg property.
> 
> Signed-off-by: Kory Maincent <kory.maincent@...tlin.com>

Hi Kory,

Some minor documentation nits from my side.

> diff --git a/Documentation/networking/pse-pd/pse-pi.rst b/Documentation/networking/pse-pd/pse-pi.rst

...

> +Table 145\u20133\u2014PSE Pinout Alternatives
> +-----------------------------------

When running make htmldocs I see the following warning:

Table 145\u20133\u2014PSE Pinout Alternatives

And the header is rendered as:

Table 145u20133u2014PSE Pinout Alternatives

I'm assuming my version of Sphinx doesn't understand the use
of escape sequences for unicode characters here.

I have observed this with (I assume this is the relevant command):

$ sphinx-build --version
sphinx-build 7.2.6

$ sphinx-build --version
sphinx-build 6.2.1

...

> diff --git a/drivers/net/pse-pd/pse_core.c b/drivers/net/pse-pd/pse_core.c

...

>  /**
> - * of_pse_zero_xlate - dummy function for controllers with one only control
> - * @pcdev: a pointer to the PSE controller device
> - * @pse_spec: PSE line specifier as found in the device tree
> - *
> - * This static translation function is used by default if of_xlate in
> - * :c:type:`pse_controller_dev` is not set. It is useful for all PSE
> - * controllers with #pse-cells = <0>.
> + * of_load_pse_pi_pairset - load PSE PI pairsets pinout and polarity

nit: of_load_pse_pi_pairsets

> + * @node: a pointer of the device node
> + * @pi: a pointer of the PSE PI to fill
> + * @npairsets: the number of pairsets (1 or 2) used by the PI
>   */
> -static int of_pse_zero_xlate(struct pse_controller_dev *pcdev,
> -			     const struct of_phandle_args *pse_spec)
> +static int of_load_pse_pi_pairsets(struct device_node *node,
> +				   struct pse_pi *pi,
> +				   int npairsets)

...

> diff --git a/include/linux/pse-pd/pse.h b/include/linux/pse-pd/pse.h

...

> @@ -73,11 +103,11 @@ struct pse_control;
>   * @pse_control_head: head of internal list of requested PSE controls
>   * @dev: corresponding driver model device struct
>   * @of_pse_n_cells: number of cells in PSE line specifiers
> - * @of_xlate: translation function to translate from specifier as found in the
> - *            device tree to id as given to the PSE control ops
>   * @nr_lines: number of PSE controls in this controller device
>   * @lock: Mutex for serialization access to the PSE controller
>   * @types: types of the PSE controller
> + * @pi: table of PSE PIs described in this controller device
> + * @of_legacy: flag set if the pse_pis devicetree node is not used

nit: it looks line the documentation didn't keep up with the
     structure during development: @no_of_pse_pi should be
     documented instead of @of_legacy.

>   */
>  struct pse_controller_dev {
>  	const struct pse_controller_ops *ops;
> @@ -86,11 +116,11 @@ struct pse_controller_dev {
>  	struct list_head pse_control_head;
>  	struct device *dev;
>  	int of_pse_n_cells;
> -	int (*of_xlate)(struct pse_controller_dev *pcdev,
> -			const struct of_phandle_args *pse_spec);
>  	unsigned int nr_lines;
>  	struct mutex lock;
>  	enum ethtool_pse_types types;
> +	struct pse_pi *pi;
> +	bool no_of_pse_pi;
>  };

...