linux-kernel - Re: [PATCH v2 5/5] misc: add ge-addon-connector driver

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Message-ID: <2024051039-decree-shrimp-45c6@gregkh>
Date: Fri, 10 May 2024 08:55:29 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Robert Foss <rfoss@...nel.org>,
	Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
	Jonas Karlman <jonas@...boo.se>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Saravana Kannan <saravanak@...gle.com>,
	Paul Kocialkowski <contact@...lk.fr>,
	Hervé Codina <herve.codina@...tlin.com>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH v2 5/5] misc: add ge-addon-connector driver

On Fri, May 10, 2024 at 09:10:41AM +0200, Luca Ceresoli wrote:
> Add a driver to support the runtime hot-pluggable add-on connector on the
> GE SUNH device. This connector allows connecting and disconnecting an
> add-on to/from the main device to augment its features. Connection and
> disconnection can happen at runtime at any moment without notice.
> 
> Different add-on models can be connected, and each has an EEPROM with a
> model identifier at a fixed address.
> 
> The add-on hardware is added and removed using device tree overlay loading
> and unloading.
> 
> Co-developed-by: Herve Codina <herve.codina@...tlin.com>
> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> Signed-off-by: Luca Ceresoli <luca.ceresoli@...tlin.com>
> 
> ---
> 
> This commit is new in v2.
> ---
>  MAINTAINERS                      |   1 +
>  drivers/misc/Kconfig             |  15 ++
>  drivers/misc/Makefile            |   1 +
>  drivers/misc/ge-sunh-connector.c | 464 +++++++++++++++++++++++++++++++++++++++
>  4 files changed, 481 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 672c26372c92..0bdb4fc496b8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -9905,6 +9905,7 @@ F:	drivers/iio/pressure/mprls0025pa*
>  HOTPLUG CONNECTOR FOR GE SUNH ADDONS
>  M:	Luca Ceresoli <luca.ceresoli@...tlin.com>
>  S:	Maintained
> +F:	drivers/misc/ge-sunh-connector.c
>  F:	Documentation/devicetree/bindings/connector/ge,sunh-addon-connector.yaml
>  
>  HP BIOSCFG DRIVER
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index 4fb291f0bf7c..99ef2eccbbaa 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -574,6 +574,21 @@ config NSM
>  	  To compile this driver as a module, choose M here.
>  	  The module will be called nsm.
>  
> +config GE_SUNH_CONNECTOR
> +	tristate "GE SUNH hotplug add-on connector"
> +	depends on OF
> +	select OF_OVERLAY
> +	select FW_LOADER
> +	select NVMEM
> +	select DRM_HOTPLUG_BRIDGE

Can these be depends instead of select?  'select' causes dependencies
that are hard, if not almost impossible, to detect at times why
something is being enabled.

> +	help
> +	  Driver for the runtime hot-pluggable add-on connector on the GE SUNH
> +	  device. This connector allows connecting and disconnecting an add-on
> +	  to/from the main device to augment its features. Connection and
> +	  disconnection can be done at runtime at any moment without
> +	  notice. Different add-on models can be connected, and each has an EEPROM
> +	  with a model identifier at a fixed address.

Module name?


> +static void sunh_conn_reset(struct sunh_conn *conn, bool keep_reset)
> +{
> +	dev_dbg(conn->dev, "reset\n");

ftrace is your friend.

> +static int sunh_conn_handle_event(struct sunh_conn *conn, bool plugged)
> +{
> +	int err;
> +
> +	if (plugged == conn->plugged)
> +		return 0;
> +
> +	dev_info(conn->dev, "%s\n", plugged ? "connected" : "disconnected");

Please remove debugging code from stuff you want to see merged.

Same for all dev_info() calls here, when drivers work properly, they are
quiet.

thanks,

greg k-h