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

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Message-ID: <20130605154921.GW3331@atomide.com>
Date:	Wed, 5 Jun 2013 08:49:22 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Mugunthan V N <mugunthanvnm@...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

* Mugunthan V N <mugunthanvnm@...com> [130530 01:14]:
> 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?

If you always need to remux all the pins, then yes that's fine with me.

Regards,

Tony
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