linux-kernel - Re: [PATCH v3 1/3] usb: typec: Separate USB Power Delivery from USB Type-C

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Message-ID: <YmjlyxLk8wfziq9l@kuha.fi.intel.com>
Date:   Wed, 27 Apr 2022 09:42:19 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Benson Leung <bleung@...gle.com>,
        Prashant Malani <pmalani@...omium.org>,
        Jameson Thies <jthies@...gle.com>,
        "Regupathy, Rajaram" <rajaram.regupathy@...el.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Won Chung <wonchung@...gle.com>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] usb: typec: Separate USB Power Delivery from USB
 Type-C

Hi,

On Tue, Apr 26, 2022 at 02:07:25PM +0200, Greg Kroah-Hartman wrote:
> On Mon, Apr 25, 2022 at 03:49:44PM +0300, Heikki Krogerus wrote:
> > --- /dev/null
> > +++ b/drivers/usb/typec/pd.h
> > @@ -0,0 +1,30 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef __USB_POWER_DELIVERY__
> > +#define __USB_POWER_DELIVERY__
> > +
> > +#include <linux/kobject.h>
> 
> Why kobject.h when:

Oops, that should now be "#include <linux/device.h>".

> > +
> > +struct pd_capabilities {
> > +	struct device dev;
> 
> This is a device?
> 
> > +	struct pd *pd;
> > +	enum typec_role role;
> > +};
> > +
> > +struct pd {
> > +	struct device		dev;
> > +	int			id;
> > +
> > +	u16			revision; /* 0300H = "3.0" */
> 
> So BCD?

Yes.

> > +	u16			version;
> > +};
> 
> > +
> > +#define to_pd_capabilities(o) container_of(o, struct pd_capabilities, dev)
> > +#define to_pd(o) container_of(o, struct pd, dev)
> > +
> > +struct pd *pd_find(const char *name);
> 
> "struct pd" is just about the shortest structure name I've seen in the
> kernel so far.  How about using some more letters?  :)

Okay, I'll make it usbpd.

> > +
> > +int pd_init(void);
> > +void pd_exit(void);
> 
> The kobject question above goes to the code as well.  You are creating a
> bunch of raw kobjects still, why?  This should all fit into the driver
> model and kobjects shouldn't be needed.  Are you trying to nest too deep
> in the attributes?  If so, kobjects will not work as userspace tools
> will not realize they are there and are attributes at all.

They are not raw kobjects, they are all devices now. That header just
needs to be fixed.

Br,

-- 
heikki