[PATCH v3 26/42] ata: pata_ep93xx: add device tree support

[Nikita Shubin via B4 Relay <devnull+nikita.shubin.maquefel.me@xxxxxxxxxx>]

From: Nikita Shubin <nikita.shubin@xxxxxxxxxxx>

- Add OF ID match table
- Drop ep93xx_chip_revision and use soc_device_match instead

Signed-off-by: Nikita Shubin <nikita.shubin@xxxxxxxxxxx>
---
 drivers/ata/pata_ep93xx.c | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/ata/pata_ep93xx.c b/drivers/ata/pata_ep93xx.c
index c6e043e05d43..a88824dfc5fa 100644
--- a/drivers/ata/pata_ep93xx.c
+++ b/drivers/ata/pata_ep93xx.c
@@ -40,9 +40,11 @@
 #include <linux/ata.h>
 #include <linux/libata.h>
 #include <linux/platform_device.h>
+#include <linux/sys_soc.h>
 #include <linux/delay.h>
 #include <linux/dmaengine.h>
 #include <linux/ktime.h>
+#include <linux/mod_devicetable.h>
 
 #include <linux/platform_data/dma-ep93xx.h>
 #include <linux/soc/cirrus/ep93xx.h>
@@ -910,6 +912,12 @@ static struct ata_port_operations ep93xx_pata_port_ops = {
 	.port_start		= ep93xx_pata_port_start,
 };
 
+static const struct soc_device_attribute ep93xx_soc_table[] = {
+	{ .revision = "E1", .data = (void *)ATA_UDMA3 },
+	{ .revision = "E2", .data = (void *)ATA_UDMA4 },
+	{ /* sentinel */ }
+};
+
 static int ep93xx_pata_probe(struct platform_device *pdev)
 {
 	struct ep93xx_pata_data *drv_data;
@@ -939,7 +947,7 @@ static int ep93xx_pata_probe(struct platform_device *pdev)
 
 	drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
 	if (!drv_data) {
-		err = -ENXIO;
+		err = -ENOMEM;
 		goto err_rel_gpio;
 	}
 
@@ -976,12 +984,11 @@ static int ep93xx_pata_probe(struct platform_device *pdev)
 	 * so this driver supports only UDMA modes.
 	 */
 	if (drv_data->dma_rx_channel && drv_data->dma_tx_channel) {
-		int chip_rev = ep93xx_chip_revision();
+		const struct soc_device_attribute *match;
 
-		if (chip_rev == EP93XX_CHIP_REV_E1)
-			ap->udma_mask = ATA_UDMA3;
-		else if (chip_rev == EP93XX_CHIP_REV_E2)
-			ap->udma_mask = ATA_UDMA4;
+		match = soc_device_match(ep93xx_soc_table);
+		if (match)
+			ap->udma_mask = (unsigned int) match->data;
 		else
 			ap->udma_mask = ATA_UDMA2;
 	}
@@ -1016,9 +1023,16 @@ static int ep93xx_pata_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id ep93xx_pata_of_ids[] = {
+	{ .compatible = "cirrus,ep9312-pata" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, ep93xx_pata_of_ids);
+
 static struct platform_driver ep93xx_pata_platform_driver = {
 	.driver = {
 		.name = DRV_NAME,
+		.of_match_table = ep93xx_pata_of_ids,
 	},
 	.probe = ep93xx_pata_probe,
 	.remove = ep93xx_pata_remove,

-- 
2.39.2