linux-kernel - Re: [PATCHv2] mmc: atmel-mci: add vmmc-supply support

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Date:	Thu, 17 Oct 2013 10:34:22 +0200
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Cc:	Ludovic Desroches <ludovic.desroches@...el.com>,
	Chris Ball <cjb@...top.org>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2] mmc: atmel-mci: add vmmc-supply support

On 17 October 2013 00:19, Alexandre Belloni
<alexandre.belloni@...e-electrons.com> wrote:
> Other MMC hosts handle a regulator named vmmc-supply that allows to power the
> MMC card or SDIO device before communicating on the bus.
>
> Signed-off-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> ---
>
> Changes in v2:
>  - use mmc_regulator_get_supply instead of devm_regulator_get
>
>  drivers/mmc/host/atmel-mci.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 69e438e..4ea5333 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -23,6 +23,7 @@
>  #include <linux/of_device.h>
>  #include <linux/of_gpio.h>
>  #include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
>  #include <linux/scatterlist.h>
>  #include <linux/seq_file.h>
>  #include <linux/slab.h>
> @@ -2198,6 +2199,14 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>         host->slot[id] = slot;
>         mmc_add_host(mmc);
>
> +       mmc_regulator_get_supply(mmc);
> +       if (!IS_ERR(mmc->supply.vmmc)) {
> +               int ret = regulator_enable(mmc->supply.vmmc);

You should not enable the regulator here, instead handle that from the
.set_ios function. This complete code chunk must also be moved prior
to mmc_add_host above.

When enabling/disabling the regulator from the .set_ios, I suppose you
want to use mmc_regulator_set_ocr API instead.

Kind regards
Ulf Hansson

> +               if (ret)
> +                       dev_err(&mmc->class_dev,
> +                               "failed to enable regulator: %d\n", ret);
> +       }
> +
>         if (gpio_is_valid(slot->detect_pin)) {
>                 int ret;
>
> --
> 1.8.1.2
>
> --
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