linux-kernel - Re: [PATCHv3] mmc: atmel-mci: add vmmc-supply support

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Date:	Thu, 17 Oct 2013 15:56:51 +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: [PATCHv3] mmc: atmel-mci: add vmmc-supply support

On 17 October 2013 12:46, 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>

Acked-by: Ulf Hansson <ulf.hansson@...aro.org>

> ---
>
> Changes in v2:
>  - use mmc_regulator_get_supply instead of devm_regulator_get
>
> Changes in v3:
>  - en/disable the regulator in .set_ios using mmc_regulator_set_ocr
>
>  drivers/mmc/host/atmel-mci.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
> index 69e438e..a9e1ba6 100644
> --- a/drivers/mmc/host/atmel-mci.c
> +++ b/drivers/mmc/host/atmel-mci.c
> @@ -1385,8 +1385,14 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>                 clk_unprepare(host->mck);
>
>         switch (ios->power_mode) {
> +       case MMC_POWER_OFF:
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
> +               break;
>         case MMC_POWER_UP:
>                 set_bit(ATMCI_CARD_NEED_INIT, &slot->flags);
> +               if (!IS_ERR(mmc->supply.vmmc))
> +                       mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
>                 break;
>         default:
>                 /*
> @@ -2196,6 +2202,7 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>         }
>
>         host->slot[id] = slot;
> +       mmc_regulator_get_supply(mmc);
>         mmc_add_host(mmc);
>
>         if (gpio_is_valid(slot->detect_pin)) {
> --
> 1.8.1.2
>
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