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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAPDyKFpWq+cT5nrqifrt+bNR3acT1rpdyxgfjY-63MCfEC18DA@mail.gmail.com>
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
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to majordomo@...r.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/