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Date:	Thu, 13 Aug 2015 11:30:08 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	Graeme Gregory <gg@...mlogic.co.uk>
Cc:	"steve.glendinning@...well.net" <steve.glendinning@...well.net>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	Jeremy Linton <Jeremy.Linton@....com>,
	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] Convert smsc911x to use ACPI as well as DT

On Thu, Aug 13, 2015 at 10:38:38AM +0100, Graeme Gregory wrote:
> On Thu, Aug 13, 2015 at 10:01:17AM +0100, Lorenzo Pieralisi wrote:
> > On Thu, Aug 13, 2015 at 09:27:59AM +0100, Graeme Gregory wrote:
> > > On Wed, Aug 12, 2015 at 05:06:27PM -0500, Jeremy Linton wrote:
> > > > Add ACPI bindings for the smsc911x driver. Convert the DT specific calls
> > > > to nonspecific device* calls, This allows the driver to work
> > > > with both ACPI and DT configurations. Ethernet should now work when using
> > > > ACPI on ARM Juno.
> > 
> > Last sentence does not belong in the commit log.
> > 
> > > > 
> > > > Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> > > 
> > > The code looks fine to me.
> > > 
> > > Currently the compulsary DT properties seem to match the "approved" ACPI
> > > NIC properties from here
> > > 
> > > http://www.uefi.org/sites/default/files/resources/nic-request-v2.pdf
> > 
> > What about _DSD device specific properties (eg "smsc,save-mac-address") ?
> > Are we taking 1:1 translation between DT and ACPI for granted ?
> > 
> > I thought some process must be put in place to define the corresponding
> > bindings in ACPI before starting this mechanical translation or maybe
> > I missed something, I would like to understand.
> > 
> > How does the device specific _DSD definitions work in ACPI world ? Where
> > are they published ? How will we translate those to DT bindings if there
> > is need ?
> > 
> 
> This I do not know as that discussion is still ongoing. But those
> options are currently marked as optional so driver should not fail if
> they are not present in ACPI.

Well yes, but if they are present this patch uses them when booting
with ACPI and that's what I am arguing about, because they are
undocumented.

This discussion should be brought to completion, the _DSD usage and
bindings sharing between DT and ACPI well defined before we can
enable drivers to rely on properties that in ACPI world have no
binding definition at all, if we go by this route we might end
up having drivers reusing DT properties that have no reason whatsoever
to exist in ACPI world.

So, to make this clear, the _DSD usage must be documented and there
has to be a way to define the related bindings in ACPI world so that
driver code can be reviewed accordingly.

Lorenzo

> Graeme
> 
> > Lorenzo
> > 
> > > Reviewed-by: Graeme Gregory <graeme.gregory@...aro.org>
> > > 
> > > Thanks
> > > 
> > > > ---
> > > >  drivers/net/ethernet/smsc/smsc911x.c | 48 +++++++++++++++++-------------------
> > > >  1 file changed, 22 insertions(+), 26 deletions(-)
> > > > 
> > > > diff --git a/drivers/net/ethernet/smsc/smsc911x.c b/drivers/net/ethernet/smsc/smsc911x.c
> > > > index 959aeea..0f21aa3 100644
> > > > --- a/drivers/net/ethernet/smsc/smsc911x.c
> > > > +++ b/drivers/net/ethernet/smsc/smsc911x.c
> > > > @@ -59,7 +59,9 @@
> > > >  #include <linux/of_device.h>
> > > >  #include <linux/of_gpio.h>
> > > >  #include <linux/of_net.h>
> > > > +#include <linux/acpi.h>
> > > >  #include <linux/pm_runtime.h>
> > > > +#include <linux/property.h>
> > > >  
> > > >  #include "smsc911x.h"
> > > >  
> > > > @@ -2362,59 +2364,46 @@ static const struct smsc911x_ops shifted_smsc911x_ops = {
> > > >  	.tx_writefifo = smsc911x_tx_writefifo_shift,
> > > >  };
> > > >  
> > > > -#ifdef CONFIG_OF
> > > > -static int smsc911x_probe_config_dt(struct smsc911x_platform_config *config,
> > > > -				    struct device_node *np)
> > > > +static int smsc911x_probe_config(struct smsc911x_platform_config *config,
> > > > +				 struct device *dev)
> > > >  {
> > > > -	const char *mac;
> > > >  	u32 width = 0;
> > > >  
> > > > -	if (!np)
> > > > +	if (!dev)
> > > >  		return -ENODEV;
> > > >  
> > > > -	config->phy_interface = of_get_phy_mode(np);
> > > > +	config->phy_interface = device_get_phy_mode(dev);
> > > >  
> > > > -	mac = of_get_mac_address(np);
> > > > -	if (mac)
> > > > -		memcpy(config->mac, mac, ETH_ALEN);
> > > > +	device_get_mac_address(dev, config->mac, ETH_ALEN);
> > > >  
> > > > -	of_property_read_u32(np, "reg-shift", &config->shift);
> > > > +	device_property_read_u32(dev, "reg-shift", &config->shift);
> > > >  
> > > > -	of_property_read_u32(np, "reg-io-width", &width);
> > > > +	device_property_read_u32(dev, "reg-io-width", &width);
> > > >  	if (width == 4)
> > > >  		config->flags |= SMSC911X_USE_32BIT;
> > > >  	else
> > > >  		config->flags |= SMSC911X_USE_16BIT;
> > > >  
> > > > -	if (of_get_property(np, "smsc,irq-active-high", NULL))
> > > > +	if (device_property_present(dev, "smsc,irq-active-high"))
> > > >  		config->irq_polarity = SMSC911X_IRQ_POLARITY_ACTIVE_HIGH;
> > > >  
> > > > -	if (of_get_property(np, "smsc,irq-push-pull", NULL))
> > > > +	if (device_property_present(dev, "smsc,irq-push-pull"))
> > > >  		config->irq_type = SMSC911X_IRQ_TYPE_PUSH_PULL;
> > > >  
> > > > -	if (of_get_property(np, "smsc,force-internal-phy", NULL))
> > > > +	if (device_property_present(dev, "smsc,force-internal-phy"))
> > > >  		config->flags |= SMSC911X_FORCE_INTERNAL_PHY;
> > > >  
> > > > -	if (of_get_property(np, "smsc,force-external-phy", NULL))
> > > > +	if (device_property_present(dev, "smsc,force-external-phy"))
> > > >  		config->flags |= SMSC911X_FORCE_EXTERNAL_PHY;
> > > >  
> > > > -	if (of_get_property(np, "smsc,save-mac-address", NULL))
> > > > +	if (device_property_present(dev, "smsc,save-mac-address"))
> > > >  		config->flags |= SMSC911X_SAVE_MAC_ADDRESS;
> > > >  
> > > >  	return 0;
> > > >  }
> > > > -#else
> > > > -static inline int smsc911x_probe_config_dt(
> > > > -				struct smsc911x_platform_config *config,
> > > > -				struct device_node *np)
> > > > -{
> > > > -	return -ENODEV;
> > > > -}
> > > > -#endif /* CONFIG_OF */
> > > >  
> > > >  static int smsc911x_drv_probe(struct platform_device *pdev)
> > > >  {
> > > > -	struct device_node *np = pdev->dev.of_node;
> > > >  	struct net_device *dev;
> > > >  	struct smsc911x_data *pdata;
> > > >  	struct smsc911x_platform_config *config = dev_get_platdata(&pdev->dev);
> > > > @@ -2478,7 +2467,7 @@ static int smsc911x_drv_probe(struct platform_device *pdev)
> > > >  		goto out_disable_resources;
> > > >  	}
> > > >  
> > > > -	retval = smsc911x_probe_config_dt(&pdata->config, np);
> > > > +	retval = smsc911x_probe_config(&pdata->config, &pdev->dev);
> > > >  	if (retval && config) {
> > > >  		/* copy config parameters across to pdata */
> > > >  		memcpy(&pdata->config, config, sizeof(pdata->config));
> > > > @@ -2654,6 +2643,12 @@ static const struct of_device_id smsc911x_dt_ids[] = {
> > > >  MODULE_DEVICE_TABLE(of, smsc911x_dt_ids);
> > > >  #endif
> > > >  
> > > > +static const struct acpi_device_id smsc911x_acpi_match[] = {
> > > > +	{ "ARMH9118", 0 },
> > > > +	{ }
> > > > +};
> > > > +MODULE_DEVICE_TABLE(acpi, smsc911x_acpi_match);
> > > > +
> > > >  static struct platform_driver smsc911x_driver = {
> > > >  	.probe = smsc911x_drv_probe,
> > > >  	.remove = smsc911x_drv_remove,
> > > > @@ -2661,6 +2656,7 @@ static struct platform_driver smsc911x_driver = {
> > > >  		.name	= SMSC_CHIPNAME,
> > > >  		.pm	= SMSC911X_PM_OPS,
> > > >  		.of_match_table = of_match_ptr(smsc911x_dt_ids),
> > > > +		.acpi_match_table = ACPI_PTR(smsc911x_acpi_match),
> > > >  	},
> > > >  };
> > > >  
> > > > -- 
> > > > 2.4.3
> > > > 
> > > > 
> > > > 
> > > > _______________________________________________
> > > > linux-arm-kernel mailing list
> > > > linux-arm-kernel@...ts.infradead.org
> > > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> > > 
> > > _______________________________________________
> > > linux-arm-kernel mailing list
> > > linux-arm-kernel@...ts.infradead.org
> > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> > > 
> > 
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 
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