diff mbox series

[v2,3/3] p54spi: convert to devicetree

Message ID 20230404082401.1087835-4-arnd@kernel.org (mailing list archive)
State Not Applicable
Headers show
Series p54spi devicetree conversion | expand

Commit Message

Arnd Bergmann April 4, 2023, 8:24 a.m. UTC 
From: Arnd Bergmann <arnd@arndb.de>

The Prism54 SPI driver hardcodes GPIO numbers and expects users to
pass them as module parameters, apparently a relic from its life as a
staging driver. This works because there is only one user, the Nokia
N8x0 tablet.

Convert this to the gpio descriptor interface and DT based probing
to improve this and simplify the code at the same time.

Acked-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 MAINTAINERS                                |  1 +
 arch/arm/mach-omap2/board-n8x0.c           | 18 ------
 drivers/net/wireless/intersil/p54/p54spi.c | 71 ++++++++--------------
 drivers/net/wireless/intersil/p54/p54spi.h |  3 +
 4 files changed, 30 insertions(+), 63 deletions(-)

Comments

Krzysztof Kozlowski April 7, 2023, 7:10 a.m. UTC | #1 
On 04/04/2023 10:24, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@arndb.de>
> 
> The Prism54 SPI driver hardcodes GPIO numbers and expects users to
> pass them as module parameters, apparently a relic from its life as a
> staging driver. This works because there is only one user, the Nokia
> N8x0 tablet.
> 
> Convert this to the gpio descriptor interface and DT based probing
> to improve this and simplify the code at the same time.
> 
> Acked-by: Christian Lamparter <chunkeey@gmail.com>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
>  MAINTAINERS                                |  1 +
>  arch/arm/mach-omap2/board-n8x0.c           | 18 ------
>  drivers/net/wireless/intersil/p54/p54spi.c | 71 ++++++++--------------
>  drivers/net/wireless/intersil/p54/p54spi.h |  3 +
>  4 files changed, 30 insertions(+), 63 deletions(-)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4f57deee1a08..9b08dcea913a 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15793,6 +15793,7 @@ M:	Christian Lamparter <chunkeey@googlemail.com>
>  L:	linux-wireless@vger.kernel.org
>  S:	Maintained
>  W:	https://wireless.wiki.kernel.org/en/users/Drivers/p54
> +F:	Documentation/devicetree/bindings/net/wireless/st,stlc45xx.yaml
>  F:	drivers/net/wireless/intersil/p54/

This hunk should be rather part of your patch #1.



Best regards,
Krzysztof
diff mbox series

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 4f57deee1a08..9b08dcea913a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15793,6 +15793,7 @@  M:	Christian Lamparter <chunkeey@googlemail.com>
 L:	linux-wireless@vger.kernel.org
 S:	Maintained
 W:	https://wireless.wiki.kernel.org/en/users/Drivers/p54
+F:	Documentation/devicetree/bindings/net/wireless/st,stlc45xx.yaml
 F:	drivers/net/wireless/intersil/p54/
 
 PACKET SOCKETS
diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index 3353b0a923d9..6a2949f50653 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -19,7 +19,6 @@ 
 #include <linux/spi/spi.h>
 #include <linux/usb/musb.h>
 #include <linux/mmc/host.h>
-#include <linux/platform_data/spi-omap2-mcspi.h>
 #include <linux/platform_data/mmc-omap.h>
 #include <linux/mfd/menelaus.h>
 
@@ -142,21 +141,6 @@  static void __init n8x0_usb_init(void) {}
 
 #endif /*CONFIG_USB_MUSB_TUSB6010 */
 
-
-static struct omap2_mcspi_device_config p54spi_mcspi_config = {
-	.turbo_mode	= 0,
-};
-
-static struct spi_board_info n800_spi_board_info[] __initdata = {
-	{
-		.modalias	= "p54spi",
-		.bus_num	= 2,
-		.chip_select	= 0,
-		.max_speed_hz   = 48000000,
-		.controller_data = &p54spi_mcspi_config,
-	},
-};
-
 #if defined(CONFIG_MENELAUS) && IS_ENABLED(CONFIG_MMC_OMAP)
 
 /*
@@ -585,7 +569,5 @@  omap_late_initcall(n8x0_late_initcall);
 void * __init n8x0_legacy_init(void)
 {
 	board_check_revision();
-	spi_register_board_info(n800_spi_board_info,
-				ARRAY_SIZE(n800_spi_board_info));
 	return &mmc1_data;
 }
diff --git a/drivers/net/wireless/intersil/p54/p54spi.c b/drivers/net/wireless/intersil/p54/p54spi.c
index 19152fd449ba..130b36f9eec0 100644
--- a/drivers/net/wireless/intersil/p54/p54spi.c
+++ b/drivers/net/wireless/intersil/p54/p54spi.c
@@ -8,6 +8,7 @@ 
  */
 
 #include <linux/module.h>
+#include <linux/mod_devicetable.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/firmware.h>
@@ -15,7 +16,7 @@ 
 #include <linux/irq.h>
 #include <linux/spi/spi.h>
 #include <linux/etherdevice.h>
-#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
 #include <linux/slab.h>
 
 #include "p54spi.h"
@@ -29,19 +30,6 @@ 
 
 MODULE_FIRMWARE("3826.arm");
 
-/* gpios should be handled in board files and provided via platform data,
- * but because it's currently impossible for p54spi to have a header file
- * in include/linux, let's use module paramaters for now
- */
-
-static int p54spi_gpio_power = 97;
-module_param(p54spi_gpio_power, int, 0444);
-MODULE_PARM_DESC(p54spi_gpio_power, "gpio number for power line");
-
-static int p54spi_gpio_irq = 87;
-module_param(p54spi_gpio_irq, int, 0444);
-MODULE_PARM_DESC(p54spi_gpio_irq, "gpio number for irq line");
-
 static void p54spi_spi_read(struct p54s_priv *priv, u8 address,
 			      void *buf, size_t len)
 {
@@ -261,14 +249,14 @@  static int p54spi_upload_firmware(struct ieee80211_hw *dev)
 
 static void p54spi_power_off(struct p54s_priv *priv)
 {
-	disable_irq(gpio_to_irq(p54spi_gpio_irq));
-	gpio_set_value(p54spi_gpio_power, 0);
+	disable_irq(priv->irq);
+	gpiod_set_value(priv->gpiodown_power, 1);
 }
 
 static void p54spi_power_on(struct p54s_priv *priv)
 {
-	gpio_set_value(p54spi_gpio_power, 1);
-	enable_irq(gpio_to_irq(p54spi_gpio_irq));
+	gpiod_set_value(priv->gpio_powerdown, 0);
+	enable_irq(priv->irq);
 
 	/* need to wait a while before device can be accessed, the length
 	 * is just a guess
@@ -607,32 +595,20 @@  static int p54spi_probe(struct spi_device *spi)
 		goto err_free;
 	}
 
-	ret = gpio_request(p54spi_gpio_power, "p54spi power");
-	if (ret < 0) {
-		dev_err(&priv->spi->dev, "power GPIO request failed: %d", ret);
+	priv->gpio_powerdown = gpiod_get(&spi->dev, "powerdown", GPIOD_OUT_HIGH);
+	if (IS_ERR(priv->gpio_powerdown)) {
+		ret = PTR_ERR(priv->gpio_powerdown);
+		dev_err(&priv->spi->dev, "powerdown GPIO request failed: %d", ret);
 		goto err_free;
 	}
 
-	ret = gpio_request(p54spi_gpio_irq, "p54spi irq");
-	if (ret < 0) {
-		dev_err(&priv->spi->dev, "irq GPIO request failed: %d", ret);
-		goto err_free_gpio_power;
-	}
-
-	gpio_direction_output(p54spi_gpio_power, 0);
-	gpio_direction_input(p54spi_gpio_irq);
-
-	ret = request_irq(gpio_to_irq(p54spi_gpio_irq),
-			  p54spi_interrupt, 0, "p54spi",
-			  priv->spi);
+	ret = request_irq(spi->irq, p54spi_interrupt, 0, "p54spi", priv->spi);
 	if (ret < 0) {
 		dev_err(&priv->spi->dev, "request_irq() failed");
-		goto err_free_gpio_irq;
+		goto err_free_gpio_power;
 	}
 
-	irq_set_irq_type(gpio_to_irq(p54spi_gpio_irq), IRQ_TYPE_EDGE_RISING);
-
-	disable_irq(gpio_to_irq(p54spi_gpio_irq));
+	disable_irq(priv->irq);
 
 	INIT_WORK(&priv->work, p54spi_work);
 	init_completion(&priv->fw_comp);
@@ -660,11 +636,9 @@  static int p54spi_probe(struct spi_device *spi)
 
 err_free_common:
 	release_firmware(priv->firmware);
-	free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
-err_free_gpio_irq:
-	gpio_free(p54spi_gpio_irq);
+	free_irq(priv->irq, spi);
 err_free_gpio_power:
-	gpio_free(p54spi_gpio_power);
+	gpiod_put(priv->gpio_powerdown);
 err_free:
 	p54_free_common(priv->hw);
 	return ret;
@@ -676,10 +650,8 @@  static void p54spi_remove(struct spi_device *spi)
 
 	p54_unregister_common(priv->hw);
 
-	free_irq(gpio_to_irq(p54spi_gpio_irq), spi);
-
-	gpio_free(p54spi_gpio_power);
-	gpio_free(p54spi_gpio_irq);
+	free_irq(priv->irq, spi);
+	gpiod_put(priv->gpio_powerdown);
 	release_firmware(priv->firmware);
 
 	mutex_destroy(&priv->mutex);
@@ -687,10 +659,19 @@  static void p54spi_remove(struct spi_device *spi)
 	p54_free_common(priv->hw);
 }
 
+struct of_device_id p54spi_of_ids[] = {
+	{ .compatible = "cnxt,3110x", },
+	{ .compatible = "isil,p54spi", },
+	{ .compatible = "st,stlc4550", },
+	{ .compatible = "st,stlc4560", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, p54spi_of_ids);
 
 static struct spi_driver p54spi_driver = {
 	.driver = {
 		.name		= "p54spi",
+		.of_match_table = p54spi_of_ids,
 	},
 
 	.probe		= p54spi_probe,
diff --git a/drivers/net/wireless/intersil/p54/p54spi.h b/drivers/net/wireless/intersil/p54/p54spi.h
index e5619a13fd61..118785cc635a 100644
--- a/drivers/net/wireless/intersil/p54/p54spi.h
+++ b/drivers/net/wireless/intersil/p54/p54spi.h
@@ -107,6 +107,9 @@  struct p54s_priv {
 
 	enum fw_state fw_state;
 	const struct firmware *firmware;
+
+	struct gpio_desc *gpio_powerdown;
+	int irq;
 };
 
 #endif /* P54SPI_H */