linux-kernel - Re: [PATCH] regulator: ab8500-ext: Don't register without initialisation data

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Date:	Wed, 22 May 2013 15:18:01 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Srinidhi KASAGAR <srinidhi.kasagar@...ricsson.com>
Subject: Re: [PATCH] regulator: ab8500-ext: Don't register without
 initialisation data

On Wed, May 22, 2013 at 2:47 PM, Lee Jones <lee.jones@...aro.org> wrote:

> This patch fixes a bug introduced in the v3.10 merge window.
>
> Some platforms will not want external registers. Rather than setting up
> lots of different clauses in the core ab8500 regulator driver not to
> call ab8500-ext init() we just won't pass the initialisation data from
> platform code. This patch checks for it and if it's missing, we won't
> register the external regulators.
>
> Cc: Mark Brown <broonie@...nel.org>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/regulator/ab8500-ext.c |    6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/drivers/regulator/ab8500-ext.c b/drivers/regulator/ab8500-ext.c
> index b4d4547..8421537 100644
> --- a/drivers/regulator/ab8500-ext.c
> +++ b/drivers/regulator/ab8500-ext.c
> @@ -334,6 +334,12 @@ int ab8500_ext_regulator_init(struct platform_device *pdev)
>                 return -EINVAL;
>         }
>
> +       /* have any external regulators been specified? */
> +       if (pdata->num_ext_regulator == 0) {
> +               dev_warn(&pdev->dev, "Not using external regulators\n");
> +               return 0;
> +       }

dev_warn() is really when we warn about something really nasty, worse
than dev_err(). It seems dev_info() is more apropriate.

Anyway since it's an urgent regression:
Acked-by: Linus Walleij <linus.walleij@...aro.org>

Linus
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