[PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[Tony Lindgren]

Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
added minimal device tree support to smc91x, but it's not working on
many platforms because of the lack of some key configuration bits.

Fix the issue by parsing the necessary configuration like the
smc911x driver is doing.

Cc: Nicolas Pitre <nico@fluxnic.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Tony Lindgren <tony@atomide.com>
---

If this looks OK, I'd like to merge this as a fix via arm-soc tree
along with the other patches in this series as my later patches
depend on patches in this series.

---
 .../devicetree/bindings/net/smsc-lan91c111.txt     |  4 ++
 drivers/net/ethernet/smsc/smc91x.c                 | 52 +++++++++++++++++-----
 2 files changed, 46 insertions(+), 10 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
index 953049b..53d69e3 100644
--- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
+++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
@@ -8,3 +8,7 @@ Required properties:
 Optional properties:
 - phy-device : phandle to Ethernet phy
 - local-mac-address : Ethernet mac address to use
+- reg-io-width : Specify the size (in bytes) of the IO accesses that
+  should be performed on the device.  Valid value for SMSC LAN is
+  1, 2 or 4.  If it's omitted or invalid, the size would be 2.
+- smsc,nowait : Setup for fast register access with no waits
diff --git a/drivers/net/ethernet/smsc/smc91x.c b/drivers/net/ethernet/smsc/smc91x.c
index 73be7f3..93d4b7d 100644
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -82,6 +82,7 @@ static const char version[] =
 #include <linux/mii.h>
 #include <linux/workqueue.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
@@ -2189,6 +2190,15 @@ static void smc_release_datacs(struct platform_device *pdev, struct net_device *
 	}
 }
 
+#if IS_BUILTIN(CONFIG_OF)
+static const struct of_device_id smc91x_match[] = {
+	{ .compatible = "smsc,lan91c94", },
+	{ .compatible = "smsc,lan91c111", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, smc91x_match);
+#endif
+
 /*
  * smc_init(void)
  *   Input parameters:
@@ -2203,6 +2213,8 @@ static void smc_release_datacs(struct platform_device *pdev, struct net_device *
 static int smc_drv_probe(struct platform_device *pdev)
 {
 	struct smc91x_platdata *pd = dev_get_platdata(&pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *match = NULL;
 	struct smc_local *lp;
 	struct net_device *ndev;
 	struct resource *res, *ires;
@@ -2222,11 +2234,40 @@ static int smc_drv_probe(struct platform_device *pdev)
 	 */
 
 	lp = netdev_priv(ndev);
+	lp->cfg.flags = 0;
 
 	if (pd) {
 		memcpy(&lp->cfg, pd, sizeof(lp->cfg));
 		lp->io_shift = SMC91X_IO_SHIFT(lp->cfg.flags);
-	} else {
+	}
+
+#if IS_BUILTIN(CONFIG_OF)
+	match = of_match_device(of_match_ptr(smc91x_match), &pdev->dev);
+	if (match) {
+		u32 val;
+
+		of_property_read_u32(np, "reg-io-width", &val);
+		switch (val) {
+		case 1:
+			lp->cfg.flags |= SMC91X_USE_8BIT;
+			break;
+		case 2:
+			lp->cfg.flags |= SMC91X_USE_16BIT;
+			break;
+		case 4:
+			lp->cfg.flags |= SMC91X_USE_32BIT;
+			break;
+		default:
+			lp->cfg.flags |= SMC91X_USE_16BIT;
+			break;
+		}
+
+		if (of_get_property(np, "smsc,nowait", NULL))
+			lp->cfg.flags |= SMC91X_NOWAIT;
+	}
+#endif
+
+	if (!pd && !match) {
 		lp->cfg.flags |= (SMC_CAN_USE_8BIT)  ? SMC91X_USE_8BIT  : 0;
 		lp->cfg.flags |= (SMC_CAN_USE_16BIT) ? SMC91X_USE_16BIT : 0;
 		lp->cfg.flags |= (SMC_CAN_USE_32BIT) ? SMC91X_USE_32BIT : 0;
@@ -2375,15 +2416,6 @@ static int smc_drv_resume(struct device *dev)
 	return 0;
 }
 
-#ifdef CONFIG_OF
-static const struct of_device_id smc91x_match[] = {
-	{ .compatible = "smsc,lan91c94", },
-	{ .compatible = "smsc,lan91c111", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, smc91x_match);
-#endif
-
 static struct dev_pm_ops smc_drv_pm_ops = {
 	.suspend	= smc_drv_suspend,
 	.resume		= smc_drv_resume,
-- 
1.8.1.1

Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[Mark Rutland]

On Thu, Nov 14, 2013 at 02:35:30AM +0000, Tony Lindgren wrote:
> Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
> added minimal device tree support to smc91x, but it's not working on
> many platforms because of the lack of some key configuration bits.
> 
> Fix the issue by parsing the necessary configuration like the
> smc911x driver is doing.
> 
> Cc: Nicolas Pitre <nico@fluxnic.net>
> Cc: "David S. Miller" <davem@davemloft.net>
> Cc: netdev@vger.kernel.org
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> ---
> 
> If this looks OK, I'd like to merge this as a fix via arm-soc tree
> along with the other patches in this series as my later patches
> depend on patches in this series.
> 
> ---
>  .../devicetree/bindings/net/smsc-lan91c111.txt     |  4 ++
>  drivers/net/ethernet/smsc/smc91x.c                 | 52 +++++++++++++++++-----
>  2 files changed, 46 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> index 953049b..53d69e3 100644
> --- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> +++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> @@ -8,3 +8,7 @@ Required properties:
>  Optional properties:
>  - phy-device : phandle to Ethernet phy
>  - local-mac-address : Ethernet mac address to use
> +- reg-io-width : Specify the size (in bytes) of the IO accesses that
> +  should be performed on the device.  Valid value for SMSC LAN is
> +  1, 2 or 4.  If it's omitted or invalid, the size would be 2.

In the driver the supported access sizes are not mutually exclusive.  It
would be nice for the binding to have the same property.

> +- smsc,nowait : Setup for fast register access with no waits

I'm confused by what this means. When would this be selected, and when
wouldn't it be?

Thanks,
Mark.

Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[Tony Lindgren]

* Mark Rutland <mark.rutland@arm.com> [131114 03:04]:
> On Thu, Nov 14, 2013 at 02:35:30AM +0000, Tony Lindgren wrote:
> > Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
> > added minimal device tree support to smc91x, but it's not working on
> > many platforms because of the lack of some key configuration bits.
> > 
> > Fix the issue by parsing the necessary configuration like the
> > smc911x driver is doing.
> > 
> > Cc: Nicolas Pitre <nico@fluxnic.net>
> > Cc: "David S. Miller" <davem@davemloft.net>
> > Cc: netdev@vger.kernel.org
> > Cc: devicetree@vger.kernel.org
> > Signed-off-by: Tony Lindgren <tony@atomide.com>
> > ---
> > 
> > If this looks OK, I'd like to merge this as a fix via arm-soc tree
> > along with the other patches in this series as my later patches
> > depend on patches in this series.
> > 
> > ---
> >  .../devicetree/bindings/net/smsc-lan91c111.txt     |  4 ++
> >  drivers/net/ethernet/smsc/smc91x.c                 | 52 +++++++++++++++++-----
> >  2 files changed, 46 insertions(+), 10 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> > index 953049b..53d69e3 100644
> > --- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> > +++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
> > @@ -8,3 +8,7 @@ Required properties:
> >  Optional properties:
> >  - phy-device : phandle to Ethernet phy
> >  - local-mac-address : Ethernet mac address to use
> > +- reg-io-width : Specify the size (in bytes) of the IO accesses that
> > +  should be performed on the device.  Valid value for SMSC LAN is
> > +  1, 2 or 4.  If it's omitted or invalid, the size would be 2.
> 
> In the driver the supported access sizes are not mutually exclusive.  It
> would be nice for the binding to have the same property.

Hmm indeed. How about we add reg-io-width-mask:

	1 = 8-bit access
	2 = 16-bit access
	4 = 32-bit access
	...

So for a driver to support 8, 16 and 32-bit access the mask would
be:
	reg-io-width-mask = <7>;

Although the values for reg-io-width would support masks too, it
might be better to have reg-io-width-mask to avoid confusion.

Or do you have any better ideas?
 
> > +- smsc,nowait : Setup for fast register access with no waits
> 
> I'm confused by what this means. When would this be selected, and when
> wouldn't it be?

The driver has a module parameter for it and the comments say:

"nowait  = 0 for normal wait states, 1 eliminates additional wait states"

Most platforms seem to set it, but the default is to not set it.
I guess we could that be a module parameter for now as that's a
timing optimization.

Regards,

Tony

Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[Tony Lindgren]

* Tony Lindgren <tony@atomide.com> [131114 08:09]:
> * Mark Rutland <mark.rutland@arm.com> [131114 03:04]:
> > 
> > In the driver the supported access sizes are not mutually exclusive.  It
> > would be nice for the binding to have the same property.
> 
> Hmm indeed. How about we add reg-io-width-mask:
> 
> 	1 = 8-bit access
> 	2 = 16-bit access
> 	4 = 32-bit access
> 	...
> 
> So for a driver to support 8, 16 and 32-bit access the mask would
> be:
> 	reg-io-width-mask = <7>;
> 
> Although the values for reg-io-width would support masks too, it
> might be better to have reg-io-width-mask to avoid confusion.
> 
> Or do you have any better ideas?
>  
> > > +- smsc,nowait : Setup for fast register access with no waits
> > 
> > I'm confused by what this means. When would this be selected, and when
> > wouldn't it be?
> 
> The driver has a module parameter for it and the comments say:
> 
> "nowait  = 0 for normal wait states, 1 eliminates additional wait states"
> 
> Most platforms seem to set it, but the default is to not set it.
> I guess we could that be a module parameter for now as that's a
> timing optimization.

Here's what I was thinking with the reg-io-width-mask. Anybody
have comments on using reg-io-width vs reg-io-width-mask?

Regards,

Tony


From: Tony Lindgren <tony@atomide.com>
Date: Wed, 13 Nov 2013 16:36:37 -0800
Subject: [PATCH] net: smc91x: Fix device tree based configuration so it's usable

Commit 89ce376c6bdc (drivers/net: Use of_match_ptr() macro in smc91x.c)
added minimal device tree support to smc91x, but it's not working on
many platforms because of the lack of some key configuration bits.

Fix the issue by parsing the necessary configuration like the
smc911x driver is doing.

Cc: Nicolas Pitre <nico@fluxnic.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Tony Lindgren <tony@atomide.com>

--- a/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
+++ b/Documentation/devicetree/bindings/net/smsc-lan91c111.txt
@@ -8,3 +8,7 @@ Required properties:
 Optional properties:
 - phy-device : phandle to Ethernet phy
 - local-mac-address : Ethernet mac address to use
+- reg-io-width-mask : Mask of sizes (in bytes) of the IO accesses that
+  are supported on the device.  Valid value for SMSC LAN91c111 are
+  1, 2 or 4.  If it's omitted or invalid, the size would be 2 meaning
+  16-bit access only.
--- a/drivers/net/ethernet/smsc/smc91x.c
+++ b/drivers/net/ethernet/smsc/smc91x.c
@@ -82,6 +82,7 @@ static const char version[] =
 #include <linux/mii.h>
 #include <linux/workqueue.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
@@ -2189,6 +2190,15 @@ static void smc_release_datacs(struct platform_device *pdev, struct net_device *
 	}
 }
 
+#if IS_BUILTIN(CONFIG_OF)
+static const struct of_device_id smc91x_match[] = {
+	{ .compatible = "smsc,lan91c94", },
+	{ .compatible = "smsc,lan91c111", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, smc91x_match);
+#endif
+
 /*
  * smc_init(void)
  *   Input parameters:
@@ -2203,6 +2213,8 @@ static void smc_release_datacs(struct platform_device *pdev, struct net_device *
 static int smc_drv_probe(struct platform_device *pdev)
 {
 	struct smc91x_platdata *pd = dev_get_platdata(&pdev->dev);
+	struct device_node *np = pdev->dev.of_node;
+	const struct of_device_id *match = NULL;
 	struct smc_local *lp;
 	struct net_device *ndev;
 	struct resource *res, *ires;
@@ -2222,11 +2234,31 @@ static int smc_drv_probe(struct platform_device *pdev)
 	 */
 
 	lp = netdev_priv(ndev);
+	lp->cfg.flags = 0;
 
 	if (pd) {
 		memcpy(&lp->cfg, pd, sizeof(lp->cfg));
 		lp->io_shift = SMC91X_IO_SHIFT(lp->cfg.flags);
-	} else {
+	}
+
+#if IS_BUILTIN(CONFIG_OF)
+	match = of_match_device(of_match_ptr(smc91x_match), &pdev->dev);
+	if (match) {
+		u32 val;
+
+		of_property_read_u32(np, "reg-io-width", &val);
+		if (val == 0)
+			lp->cfg.flags |= SMC91X_USE_16BIT;
+		if (val & 1)
+			lp->cfg.flags |= SMC91X_USE_8BIT;
+		if (val & 2)
+			lp->cfg.flags |= SMC91X_USE_16BIT;
+		if (val & 4)
+			lp->cfg.flags |= SMC91X_USE_32BIT;
+	}
+#endif
+
+	if (!pd && !match) {
 		lp->cfg.flags |= (SMC_CAN_USE_8BIT)  ? SMC91X_USE_8BIT  : 0;
 		lp->cfg.flags |= (SMC_CAN_USE_16BIT) ? SMC91X_USE_16BIT : 0;
 		lp->cfg.flags |= (SMC_CAN_USE_32BIT) ? SMC91X_USE_32BIT : 0;
@@ -2375,15 +2407,6 @@ static int smc_drv_resume(struct device *dev)
 	return 0;
 }
 
-#ifdef CONFIG_OF
-static const struct of_device_id smc91x_match[] = {
-	{ .compatible = "smsc,lan91c94", },
-	{ .compatible = "smsc,lan91c111", },
-	{},
-};
-MODULE_DEVICE_TABLE(of, smc91x_match);
-#endif
-
 static struct dev_pm_ops smc_drv_pm_ops = {
 	.suspend	= smc_drv_suspend,
 	.resume		= smc_drv_resume,

Re: [PATCH 1/8] net: smc91x: Fix device tree based configuration so it's usable

[Tony Lindgren]

* Tony Lindgren <tony@atomide.com> [131116 07:17]:
>
> Here's what I was thinking with the reg-io-width-mask. Anybody
> have comments on using reg-io-width vs reg-io-width-mask?
...

> --- a/drivers/net/ethernet/smsc/smc91x.c
> +++ b/drivers/net/ethernet/smsc/smc91x.c
> @@ -2222,11 +2234,31 @@ static int smc_drv_probe(struct platform_device *pdev)
>  	 */
>  
>  	lp = netdev_priv(ndev);
> +	lp->cfg.flags = 0;
>  
>  	if (pd) {
>  		memcpy(&lp->cfg, pd, sizeof(lp->cfg));
>  		lp->io_shift = SMC91X_IO_SHIFT(lp->cfg.flags);
> -	} else {
> +	}
> +
> +#if IS_BUILTIN(CONFIG_OF)
> +	match = of_match_device(of_match_ptr(smc91x_match), &pdev->dev);
> +	if (match) {
> +		u32 val;
> +
> +		of_property_read_u32(np, "reg-io-width", &val);
> +		if (val == 0)
> +			lp->cfg.flags |= SMC91X_USE_16BIT;
> +		if (val & 1)
> +			lp->cfg.flags |= SMC91X_USE_8BIT;
> +		if (val & 2)
> +			lp->cfg.flags |= SMC91X_USE_16BIT;
> +		if (val & 4)
> +			lp->cfg.flags |= SMC91X_USE_32BIT;
> +	}
> +#endif
> +
> +	if (!pd && !match) {
>  		lp->cfg.flags |= (SMC_CAN_USE_8BIT)  ? SMC91X_USE_8BIT  : 0;
>  		lp->cfg.flags |= (SMC_CAN_USE_16BIT) ? SMC91X_USE_16BIT : 0;
>  		lp->cfg.flags |= (SMC_CAN_USE_32BIT) ? SMC91X_USE_32BIT : 0;

Looks this patch is missing the check for the return value for
of_property_read_u32(), will repost this patch separately as the
others in this series are out of the way now.

Regards,

Tony