linux-kernel - Re: [PATCH] pcf857x: support working w/o platform data

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Date:	Fri, 25 Jun 2010 03:17:11 -0700 (PDT)
From:	David Brownell <david-b@...bell.net>
To:	linux-kernel@...r.kernel.org,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Cc:	Jean Delvare <khali@...ux-fr.org>
Subject: Re: [PATCH] pcf857x: support working w/o platform data



--- On Thu, 6/17/10, Dmitry Eremin-Solenikov <dbaryshkov@...il.com> wrote:

> Provide sane defaults for pcf857x, so
> the driver can be used w/o
> providing platform data (and thus can be simply bound via OF tree).


Maybe we can get an ack from some OF folk
who are using it in that way?



> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
> ---
>  drivers/gpio/pcf857x.c |    9 ++++-----
>  1 files changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpio/pcf857x.c
> b/drivers/gpio/pcf857x.c
> index 29f19ce..879b473 100644
> --- a/drivers/gpio/pcf857x.c
> +++ b/drivers/gpio/pcf857x.c
> @@ -190,7 +190,6 @@ static int pcf857x_probe(struct
> i2c_client *client,
>      pdata = client->dev.platform_data;
>      if (!pdata) {
>         
> dev_dbg(&client->dev, "no platform data\n");
> -        return -EINVAL;
>      }
>  
>      /* Allocate, initialize, and register
> this gpio_chip. */
> @@ -200,7 +199,7 @@ static int pcf857x_probe(struct
> i2c_client *client,
>  
>      mutex_init(&gpio->lock);
>  
> -    gpio->chip.base =
> pdata->gpio_base;
> +    gpio->chip.base = pdata ?
> pdata->gpio_base : -1;
>      gpio->chip.can_sleep = 1;
>      gpio->chip.dev =
> &client->dev;
>      gpio->chip.owner = THIS_MODULE;
> @@ -278,7 +277,7 @@ static int pcf857x_probe(struct
> i2c_client *client,
>       * to zero, our software copy
> of the "latch" then matches the chip's
>       * all-ones reset
> state.  Otherwise it flags pins to be driven low.
>       */
> -    gpio->out = ~pdata->n_latch;
> +    gpio->out = pdata ?
> ~pdata->n_latch : ~0;
>  
>      status =
> gpiochip_add(&gpio->chip);
>      if (status < 0)
> @@ -299,7 +298,7 @@ static int pcf857x_probe(struct
> i2c_client *client,
>      /* Let platform code set up the GPIOs
> and their users.
>       * Now is the first time
> anyone could use them.
>       */
> -    if (pdata->setup) {
> +    if (pdata && pdata->setup)
> {
>          status =
> pdata->setup(client,
>             
>     gpio->chip.base, gpio->chip.ngpio,
>             
>     pdata->context);
> @@ -322,7 +321,7 @@ static int pcf857x_remove(struct
> i2c_client *client)
>      struct pcf857x   
>         *gpio =
> i2c_get_clientdata(client);
>      int   
>            
> status = 0;
>  
> -    if (pdata->teardown) {
> +    if (pdata &&
> pdata->teardown) {
>          status =
> pdata->teardown(client,
>             
>     gpio->chip.base, gpio->chip.ngpio,
>             
>     pdata->context);
> -- 
> 1.7.1
> 
> 

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