netdev - Re: [net-next PATCH v3 1/6] net: cpsw: enhance pinctrl support

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Date:	Thu, 30 May 2013 13:38:23 +0530
From:	Mugunthan V N <mugunthanvnm@...com>
To:	Tony Lindgren <tony@...mide.com>
CC:	<netdev@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
	Hebbar Gururaja <gururaja.hebbar@...com>,
	<benoit.cousson@...aro.org>, <linux-omap@...r.kernel.org>,
	<davem@...emloft.net>
Subject: Re: [net-next PATCH v3 1/6] net: cpsw: enhance pinctrl support

On 5/28/2013 7:35 PM, Mugunthan V N wrote:
> On 5/28/2013 3:06 AM, Tony Lindgren wrote:
>> * Mugunthan V N <mugunthanvnm@...com> [130526 11:28]:
>>> From: Hebbar Gururaja <gururaja.hebbar@...com>
>>>
>>> Amend cpsw controller to optionally take a pin control handle and set
>>> the state of the pins to:
>>>
>>> - "default" on boot, resume
>>> - "sleep" on suspend()
>>>
>>> This should make it possible to optimize energy usage for the pins
>>> for the suspend/resume cycle.
>>>
>>> If any of the above pin states are missing in dt, a warning message
>>> about the missing state is displayed.
>>> If certain pin-states are not available, to remove this warning message
>>> pass respective state name with null phandler.
>>>
>>> Signed-off-by: Hebbar Gururaja <gururaja.hebbar@...com>
>>> Signed-off-by: Mugunthan V N <mugunthanvnm@...com>
>>> ---
>>>   drivers/net/ethernet/ti/cpsw.c |   48 
>>> ++++++++++++++++++++++++++++++++++++++++
>>>   1 file changed, 48 insertions(+)
>>>
>>> diff --git a/drivers/net/ethernet/ti/cpsw.c 
>>> b/drivers/net/ethernet/ti/cpsw.c
>>> index 21a5b29..c9ed730 100644
>>> --- a/drivers/net/ethernet/ti/cpsw.c
>>> +++ b/drivers/net/ethernet/ti/cpsw.c
>>> @@ -35,6 +35,7 @@
>>>   #include <linux/if_vlan.h>
>>>     #include <linux/platform_data/cpsw.h>
>>> +#include <linux/pinctrl/consumer.h>
>>>     #include "cpsw_ale.h"
>>>   #include "cpts.h"
>>> @@ -351,6 +352,11 @@ struct cpsw_priv {
>>>       bool irq_enabled;
>>>       struct cpts *cpts;
>>>       u32 emac_port;
>>> +
>>> +    /* Two optional pin states - default & sleep */
>>> +    struct pinctrl        *pinctrl;
>>> +    struct pinctrl_state    *pins_def;
>>> +    struct pinctrl_state    *pins_sleep;
>>>   };
>> Which pins do you need to dynamically remux? If it's not all
>> the pins, you should have three sets: default, active and idle.
>> This way the static pins in the default group don't need to be
>> constantly toggled.
>>
>> Regards,
>>
>> Tony
> Tony
>
> I am using this for all the pins, in probe all the cpsw pins will be 
> configured
> and i have used the same in suspend/resume callback for power saving.
>
Tony

Do you have any comments on this, or is it ok with two pinctrl_state nodes?

Regards
Mugunthan V N

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