linux-kernel - Re: [PATCH 7/9] serdev: Introduce new bus for serial attached devices

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Date:   Sun, 8 Jan 2017 23:41:00 +0100
From:   Sebastian Reichel <sre@...nel.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Jiri Slaby <jslaby@...e.com>, Arnd Bergmann <arnd@...db.de>,
        "Dr . H . Nikolaus Schaller" <hns@...delico.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alan Cox <gnomes@...rguk.ukuu.org.uk>,
        Loic Poulain <loic.poulain@...el.com>,
        Pavel Machek <pavel@....cz>, NeilBrown <neil@...wn.name>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-bluetooth@...r.kernel.org, linux-serial@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 7/9] serdev: Introduce new bus for serial attached devices

Hi,

On Fri, Jan 06, 2017 at 10:26:33AM -0600, Rob Herring wrote:
> [...]
>
> +static int serdev_device_match(struct device *dev, struct device_driver *drv)
> +{
> +	return of_driver_match_device(dev, drv);
> +}

Maybe add a TODO note here for ACPI/platform support?

> [...]
>
> +int serdev_device_open(struct serdev_device *serdev)
> +{
> +	struct serdev_controller *ctrl = serdev->ctrl;
> +
> +	if (!ctrl || !ctrl->ops->open)
> +		return 0;
> +
> +	return serdev->ctrl->ops->open(ctrl);
> +}
> +EXPORT_SYMBOL_GPL(serdev_device_open);

I would expect an error code if a serdev has no controller / open
method assigned?

> [...]
>
> +static int of_serdev_register_devices(struct serdev_controller *ctrl)
> +{
> +	struct device_node *node;
> +	struct serdev_device *serdev = NULL;
> +	int err;
> +	bool found = false;
> +
> +	for_each_available_child_of_node(ctrl->dev.of_node, node) {
> +		if (!of_get_property(node, "compatible", NULL))
> +			continue;
> +
> +		dev_dbg(&ctrl->dev, "adding child %s\n", node->full_name);
> +
> +		serdev = serdev_device_alloc(ctrl);
> +		if (!serdev)
> +			continue;
> +
> +		serdev->dev.of_node = node;
> +
> +		err = serdev_device_add(serdev);
> +		if (err) {
> +			dev_err(&serdev->dev,
> +				"failure adding device. status %d\n", err);
> +			serdev_device_put(serdev);

missing continue here?

> +		}
> +		found = true;
> +	}
> +	if (!found)
> +		return -ENODEV;
> +
> +	return 0;
> +}

-- Sebastian

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