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

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Date: Thu, 20 Jul 2023 14:29:26 +0300
From:
 Nikita Shubin via B4 Relay <devnull+nikita.shubin.maquefel.me@...nel.org>
To: Hartley Sweeten <hsweeten@...ionengravers.com>, 
 Lennert Buytenhek <kernel@...tstofly.org>, 
 Alexander Sverdlin <alexander.sverdlin@...il.com>, 
 Russell King <linux@...linux.org.uk>, Lukasz Majewski <lukma@...x.de>, 
 Linus Walleij <linus.walleij@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, Nikita Shubin <nikita.shubin@...uefel.me>, 
 Daniel Lezcano <daniel.lezcano@...aro.org>, 
 Thomas Gleixner <tglx@...utronix.de>, 
 Alessandro Zummo <a.zummo@...ertech.it>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Wim Van Sebroeck <wim@...ux-watchdog.org>, 
 Guenter Roeck <linux@...ck-us.net>, Sebastian Reichel <sre@...nel.org>, 
 Thierry Reding <thierry.reding@...il.com>, 
 Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, 
 Mark Brown <broonie@...nel.org>, "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>, Vinod Koul <vkoul@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Damien Le Moal <dlemoal@...nel.org>, Sergey Shtylyov <s.shtylyov@....ru>, 
 Dmitry Torokhov <dmitry.torokhov@...il.com>, Arnd Bergmann <arnd@...db.de>, 
 Olof Johansson <olof@...om.net>, soc@...nel.org, 
 Liam Girdwood <lgirdwood@...il.com>, Jaroslav Kysela <perex@...ex.cz>, 
 Takashi Iwai <tiwai@...e.com>, Andy Shevchenko <andy@...nel.org>, 
 Michael Peters <mpeters@...eddedTS.com>, Kris Bahnsen <kris@...eddedTS.com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-clk@...r.kernel.org, linux-rtc@...r.kernel.org, 
 linux-watchdog@...r.kernel.org, linux-pm@...r.kernel.org, 
 linux-pwm@...r.kernel.org, linux-spi@...r.kernel.org, 
 netdev@...r.kernel.org, dmaengine@...r.kernel.org, 
 linux-mtd@...ts.infradead.org, linux-ide@...r.kernel.org, 
 linux-input@...r.kernel.org, alsa-devel@...a-project.org
Subject: [PATCH v3 26/42] ata: pata_ep93xx: add device tree support

From: Nikita Shubin <nikita.shubin@...uefel.me>

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

Signed-off-by: Nikita Shubin <nikita.shubin@...uefel.me>
---
 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