Re: [PATCH 2/2] Convert smsc911x to use ACPI as well as DT

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:

quoted

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.

quoted

Signed-off-by: Jeremy Linton <redacted>

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 ?

Lorenzo

Reviewed-by: Graeme Gregory <redacted>

Thanks

quoted

---
 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



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