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

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Date:	Thu, 17 Oct 2013 10:59:20 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Ulf Hansson <ulf.hansson@...aro.org>
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 17/10/2013 10:34, Ulf Hansson wrote:
> 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.

Right, I was wondering about that. I actually had a version where it was
before mmc_add_host
>
> When enabling/disabling the regulator from the .set_ios, I suppose you
> want to use mmc_regulator_set_ocr API instead.

Oh right, I pretty new to the mmc subsystem and I was probably to tired
to find that one yesterday. I actually looked for regulator_enable in
mmc/core/core.c and didn't see it ...

Thank you for your prompt reviews.


-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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