linux-kernel - Re: [PATCH] mmc: omap_hsmmc: Update driver to support without regulators

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Message-ID: <55AEA769.9080300@ti.com>
Date:	Tue, 21 Jul 2015 15:11:21 -0500
From:	"Franklin S Cooper Jr." <fcooper@...com>
To:	<balbi@...com>
CC:	<linux-omap@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kishon@...com>, <rogerq@...com>,
	Lokesh Vutla <lokeshvutla@...com>,
	Murali Karicheri <m-karicheri2@...com>
Subject: Re: [PATCH] mmc: omap_hsmmc: Update driver to support without regulators



On 07/21/2015 02:57 PM, Felipe Balbi wrote:
> On Tue, Jul 14, 2015 at 02:29:46PM -0500, Franklin S Cooper Jr wrote:
>> From: Roger Quadros <rogerq@...com>
>>
>> Update driver to support without regulators.
>>
>> Without this patch boards that do not enable regulator config options will
>> fail to boot with a kernel panic.
>>
>> Signed-off-by: Roger Quadros <rogerq@...com>
>> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
>> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>> Signed-off-by: Franklin S Cooper Jr <fcooper@...com>
>> ---
>>  Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt |  2 ++
>>  drivers/mmc/host/omap_hsmmc.c                           | 14 ++++++++++----
>>  2 files changed, 12 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
>> index 76bf087..2408e87 100644
>> --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
>> +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
>> @@ -22,6 +22,8 @@ ti,dual-volt: boolean, supports dual voltage cards
>>  ti,non-removable: non-removable slot (like eMMC)
>>  ti,needs-special-reset: Requires a special softreset sequence
>>  ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
>> +voltage-ranges: Specify the voltage range supported if regulator framework
>> +isn't enabled.
>>  dmas: List of DMA specifiers with the controller specific format
>>  as described in the generic DMA client binding. A tx and rx
>>  specifier is required.
>> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
>> index b2b411d..16c870f 100644
>> --- a/drivers/mmc/host/omap_hsmmc.c
>> +++ b/drivers/mmc/host/omap_hsmmc.c
>> @@ -1551,10 +1551,13 @@ static void omap_hsmmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>>  	if (ios->power_mode != host->power_mode) {
>>  		switch (ios->power_mode) {
>>  		case MMC_POWER_OFF:
>> -			mmc_pdata(host)->set_power(host->dev, 0, 0);
>> +			if (host->use_reg)
>> +				mmc_pdata(host)->set_power(host->dev, 0, 0);
> looks like this driver should just be use regulator_get_optional(), then
> ->set_power() would still work, no ?
Wouldn't there still be a dependency on the regulator framework to get that to work?

I guess my intention was to fix not having the regulator framework. But I'm sure there are
other ways to support not having a regulator defined as long as CONFIG_REGULATOR is enabled.
For example dummy regulator worked fine when I tried it.
>

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