linux-kernel - Re: [PATCH] mmc: host: omap_hsmmc: add a verbose print to enable CONFIG_REGULATOR

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Message-ID: <20160114120706.GA12774@earth>
Date:	Thu, 14 Jan 2016 13:07:06 +0100
From:	Sebastian Reichel <sre@...nel.org>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	Ulf Hansson <ulf.hansson@...aro.org>, pali.rohar@...il.com,
	pavel@....cz, khilman@...nel.org, aaro.koskinen@....fi,
	ivo.g.dimitrov.75@...il.com, patrikbachan@...il.com,
	linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, NeilBrown <neilb@...e.de>,
	linux-mmc@...r.kernel.org, nsekhar@...com
Subject: Re: [PATCH] mmc: host: omap_hsmmc: add a verbose print to enable
 CONFIG_REGULATOR_PBIAS

Hi,

On Thu, Jan 14, 2016 at 02:45:20PM +0530, Kishon Vijay Abraham I wrote:
> Since v4.3+, CONFIG_REGULATOR_PBIAS should be enabled (for platforms that
> have PBIAS regulator) in order for MMC1 to work.
> 
> Add a more verbose print to help enable CONFIG_REGULATOR_PBIAS for users
> using a olddefconfig or a custom .config.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/mmc/host/omap_hsmmc.c |    5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index 7fb0753..7086bd6 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -503,8 +503,11 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
>  	host->pbias = devm_regulator_get_optional(host->dev, "pbias");
>  	if (IS_ERR(host->pbias)) {
>  		ret = PTR_ERR(host->pbias);
> -		if ((ret != -ENODEV) && host->dev->of_node)
> +		if ((ret != -ENODEV) && host->dev->of_node) {
> +			dev_err(host->dev,
> +			"SD card detect fail? enable CONFIG_REGULATOR_PBIAS\n");
>  			return ret;
> +		}
>  		dev_dbg(host->dev, "unable to get pbias regulator %ld\n",
>  			PTR_ERR(host->pbias));
>  		host->pbias = NULL;


Is there a good reason against adding "depends on REGULATOR_PBIAS"
to MMC_OMAP_HS? I guess it's required for most systems and the regulator
driver is just 250 loc. I am aware, that this will disable the
hsmmc driver for 'make oldconfig', but I guess that will be noticed
in a similar way your warning is noticed.

The advantage of having the depends line is, that people configuring
their kernel have a chance to notice the regulator requirement
during configuration.

Anyways, this message improves the situation, so:

Acked-By: Sebastian Reichel <sre@...nel.org>

-- Sebastian

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