linux-kernel - Re: [PATCH v3 3/5] platform/chrome: cros_ec_proto: Introduce cros_ec_cmd

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Message-ID: <ZmkHIeMCYpcxCC6l@google.com>
Date: Wed, 12 Jun 2024 02:25:37 +0000
From: Tzung-Bi Shih <tzungbi@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Benson Leung <bleung@...omium.org>, Guenter Roeck <groeck@...omium.org>,
	Sebastian Reichel <sre@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Len Brown <lenb@...nel.org>, Robert Moore <robert.moore@...el.com>,
	chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org,
	Mario Limonciello <mario.limonciello@....com>,
	Dustin Howett <dustin@...ett.net>,
	Stephen Horvath <s.horvath@...look.com.au>,
	Rajas Paranjpe <paranjperajas@...il.com>,
	linux-acpi@...r.kernel.org, acpica-devel@...ts.linux.dev,
	Matt Hartley <matt.hartley@...il.com>
Subject: Re: [PATCH v3 3/5] platform/chrome: cros_ec_proto: Introduce
 cros_ec_cmd_versions()

On Tue, Jun 11, 2024 at 02:14:33PM +0200, Thomas Weißschuh wrote:
> On 2024-06-11 11:35:39+0000, Tzung-Bi Shih wrote:
> > On Mon, Jun 10, 2024 at 05:51:08PM +0200, Thomas Weißschuh wrote:
> > > + *
> > > + * @ec_dev: EC device
> > > + * @cmd: Command to test
> > > + *
> > > + * Return: version mask on success, negative error number on failure.
> > > + */
> > > +int cros_ec_cmd_versions(struct cros_ec_device *ec_dev, u16 cmd)
> > 
> > Could it support a "version" parameter as existing EC_CMD_GET_CMD_VERSIONS
> > usages use both versions?  An `u16 cmd` parameter and down-cast to u8 for v0
> > should be fine. (ec_params_get_cmd_versions vs. ec_params_get_cmd_versions_v1)
> 
> Ack.
> 
> Or we could automatically use v0 if cmd <= U8_MAX?

Ack.  Looks feasible.