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SubjectRe: [PATCHv2] mmc: atmel-mci: add vmmc-supply support
From
On 17 October 2013 00:19, Alexandre Belloni
<alexandre.belloni@free-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@free-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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