[PATCH V2] mmc: pwrseq_simple: Make reset-gpios optional to match doc

[PATCH V2] mmc: pwrseq_simple: Make reset-gpios optional to match doc

[Martin Fuzzey]

The DT binding doc says reset-gpios is an optional property but the code
currently bails out if it is omitted.

This is a regression since it breaks previously working device trees.
Fix it by restoring the original documented behaviour.

Fixes: ce037275861e ("mmc: pwrseq_simple: use GPIO descriptors array API")
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>

---
V2:
Fix review comments by Ulf Hansson:
    * Handle -ENOSYS case when CONFIG_GPIOLIB not selected
      This causes checkpatch to complain with
	   "WARNING: ENOSYS means 'invalid syscall nr' and nothing else"
      but I guess that's ok here.
    * Update patch description to make it clear this is a regression fix
    * Add Fixes tag

Add Tested-by tag from Tony Lingdren
---
 drivers/mmc/core/pwrseq_simple.c |   22 ++++++++++++++--------
 1 file changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
index d10538b..96f45ca 100644
--- a/drivers/mmc/core/pwrseq_simple.c
+++ b/drivers/mmc/core/pwrseq_simple.c
@@ -29,15 +29,18 @@ struct mmc_pwrseq_simple {
 static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
 					      int value)
 {
-	int i;
 	struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
-	int values[reset_gpios->ndescs];
 
-	for (i = 0; i < reset_gpios->ndescs; i++)
-		values[i] = value;
+	if (!IS_ERR(reset_gpios)) {
+		int i;
+		int values[reset_gpios->ndescs];
 
-	gpiod_set_array_value_cansleep(reset_gpios->ndescs, reset_gpios->desc,
-				       values);
+		for (i = 0; i < reset_gpios->ndescs; i++)
+			values[i] = value;
+
+		gpiod_set_array_value_cansleep(
+			reset_gpios->ndescs, reset_gpios->desc, values);
+	}
 }
 
 static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
@@ -79,7 +82,8 @@ static void mmc_pwrseq_simple_free(struct mmc_host *host)
 	struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
 					struct mmc_pwrseq_simple, pwrseq);
 
-	gpiod_put_array(pwrseq->reset_gpios);
+	if (!IS_ERR(pwrseq->reset_gpios))
+		gpiod_put_array(pwrseq->reset_gpios);
 
 	if (!IS_ERR(pwrseq->ext_clk))
 		clk_put(pwrseq->ext_clk);
@@ -112,7 +116,9 @@ struct mmc_pwrseq *mmc_pwrseq_simple_alloc(struct mmc_host *host,
 	}
 
 	pwrseq->reset_gpios = gpiod_get_array(dev, "reset", GPIOD_OUT_HIGH);
-	if (IS_ERR(pwrseq->reset_gpios)) {
+	if (IS_ERR(pwrseq->reset_gpios) &&
+	    PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
+	    PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) {
 		ret = PTR_ERR(pwrseq->reset_gpios);
 		goto clk_put;
 	}

[PATCH V2] mmc: pwrseq_simple: Make reset-gpios optional to match doc

[Ulf Hansson]

On 20 January 2016 at 16:08, Martin Fuzzey <mfuzzey@parkeon.com> wrote:
> The DT binding doc says reset-gpios is an optional property but the code
> currently bails out if it is omitted.
>
> This is a regression since it breaks previously working device trees.
> Fix it by restoring the original documented behaviour.
>
> Fixes: ce037275861e ("mmc: pwrseq_simple: use GPIO descriptors array API")
> Tested-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>

Thanks, applied for fixes!

Kind regards
Uffe

>
> ---
> V2:
> Fix review comments by Ulf Hansson:
>     * Handle -ENOSYS case when CONFIG_GPIOLIB not selected
>       This causes checkpatch to complain with
>            "WARNING: ENOSYS means 'invalid syscall nr' and nothing else"
>       but I guess that's ok here.
>     * Update patch description to make it clear this is a regression fix
>     * Add Fixes tag
>
> Add Tested-by tag from Tony Lingdren
> ---
>  drivers/mmc/core/pwrseq_simple.c |   22 ++++++++++++++--------
>  1 file changed, 14 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/core/pwrseq_simple.c b/drivers/mmc/core/pwrseq_simple.c
> index d10538b..96f45ca 100644
> --- a/drivers/mmc/core/pwrseq_simple.c
> +++ b/drivers/mmc/core/pwrseq_simple.c
> @@ -29,15 +29,18 @@ struct mmc_pwrseq_simple {
>  static void mmc_pwrseq_simple_set_gpios_value(struct mmc_pwrseq_simple *pwrseq,
>                                               int value)
>  {
> -       int i;
>         struct gpio_descs *reset_gpios = pwrseq->reset_gpios;
> -       int values[reset_gpios->ndescs];
>
> -       for (i = 0; i < reset_gpios->ndescs; i++)
> -               values[i] = value;
> +       if (!IS_ERR(reset_gpios)) {
> +               int i;
> +               int values[reset_gpios->ndescs];
>
> -       gpiod_set_array_value_cansleep(reset_gpios->ndescs, reset_gpios->desc,
> -                                      values);
> +               for (i = 0; i < reset_gpios->ndescs; i++)
> +                       values[i] = value;
> +
> +               gpiod_set_array_value_cansleep(
> +                       reset_gpios->ndescs, reset_gpios->desc, values);
> +       }
>  }
>
>  static void mmc_pwrseq_simple_pre_power_on(struct mmc_host *host)
> @@ -79,7 +82,8 @@ static void mmc_pwrseq_simple_free(struct mmc_host *host)
>         struct mmc_pwrseq_simple *pwrseq = container_of(host->pwrseq,
>                                         struct mmc_pwrseq_simple, pwrseq);
>
> -       gpiod_put_array(pwrseq->reset_gpios);
> +       if (!IS_ERR(pwrseq->reset_gpios))
> +               gpiod_put_array(pwrseq->reset_gpios);
>
>         if (!IS_ERR(pwrseq->ext_clk))
>                 clk_put(pwrseq->ext_clk);
> @@ -112,7 +116,9 @@ struct mmc_pwrseq *mmc_pwrseq_simple_alloc(struct mmc_host *host,
>         }
>
>         pwrseq->reset_gpios = gpiod_get_array(dev, "reset", GPIOD_OUT_HIGH);
> -       if (IS_ERR(pwrseq->reset_gpios)) {
> +       if (IS_ERR(pwrseq->reset_gpios) &&
> +           PTR_ERR(pwrseq->reset_gpios) != -ENOENT &&
> +           PTR_ERR(pwrseq->reset_gpios) != -ENOSYS) {
>                 ret = PTR_ERR(pwrseq->reset_gpios);
>                 goto clk_put;
>         }
>