linux-kernel - Re: [PATCH] drivers/i2c: use simple i2c probe

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Date:   Mon, 5 Dec 2022 10:43:39 +0100
From:   Wolfram Sang <wsa@...nel.org>
To:     Stephen Kitt <steve@....org>
Cc:     Guenter Roeck <linux@...ck-us.net>, Peter Rosin <peda@...ntia.se>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/i2c: use simple i2c probe

On Wed, Oct 12, 2022 at 06:36:47PM +0200, Stephen Kitt wrote:
> All these drivers have an i2c probe function which doesn't use the
> "struct i2c_device_id *id" parameter, so they can trivially be
> converted to the "probe_new" style of probe with a single argument.
> 
> This is part of an ongoing transition to single-argument i2c probe
> functions. Old-style probe functions involve a call to i2c_match_id:
> in drivers/i2c/i2c-core-base.c,
> 
>          /*
>           * When there are no more users of probe(),
>           * rename probe_new to probe.
>           */
>          if (driver->probe_new)
>                  status = driver->probe_new(client);
>          else if (driver->probe)
>                  status = driver->probe(client,
>                                         i2c_match_id(driver->id_table, client));
>          else
>                  status = -EINVAL;
> 
> Drivers which don't need the second parameter can be declared using
> probe_new instead, avoiding the call to i2c_match_id. Drivers which do
> can still be converted to probe_new-style, calling i2c_match_id
> themselves (as is done currently for of_match_id).
> 
> This change was done using the following Coccinelle script, and fixed
> up for whitespace changes:
> 
> @ rule1 @
> identifier fn;
> identifier client, id;
> @@
> 
> - static int fn(struct i2c_client *client, const struct i2c_device_id *id)
> + static int fn(struct i2c_client *client)
> {
> ...when != id
> }
> 
> @ rule2 depends on rule1 @
> identifier rule1.fn;
> identifier driver;
> @@
> 
> struct i2c_driver driver = {
> -       .probe
> +       .probe_new
>                 =
> (
>                    fn
> |
> -                  &fn
> +                  fn
> )
>                 ,
> };
> 
> Signed-off-by: Stephen Kitt <steve@....org>

Dropped the mux-part because I applied an older patch doing the same.
Despite that, applied the rest to for-next, thanks!


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