Patch "ARM/musb: omap2: Remove global GPIO numbers from TUSB6010" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    ARM/musb: omap2: Remove global GPIO numbers from TUSB6010

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     arm-musb-omap2-remove-global-gpio-numbers-from-tusb6.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2f139c285f7332a13debbe4cd24ebab9c482ccde
Author: Linus Walleij <linus.walleij@xxxxxxxxxx>
Date:   Sun Apr 30 21:38:24 2023 +0200

    ARM/musb: omap2: Remove global GPIO numbers from TUSB6010
    
    [ Upstream commit 8e0285ab95a9baf374f2c13eb152221c8ecb3f28 ]
    
    The TUSB6010 (MUSB) device is picking up some GPIO lines
    hardcoded by number and passing on to the TUSB6010 device
    when registering it.
    
    Instead of nasty workarounds, provide a GPIO descriptor
    table and then make the TUSB6010 MUSB glue driver pick up
    the GPIO lines directly, convert it to an IRQ and pass down
    to the MUSB driver. OMAP2 is the only system using the
    TUSB6010.
    
    Stash the GPIO descriptors in the glue layer and use
    then to power up and down the TUSB6010 on-demand, instead
    of using boardfile callbacks.
    
    Since the OMAP2 boards are the only boards using the
    .set_power() and .board_set_power() callbacks, we can
    just delete them as the power is now handled directly
    in the TUSB6010 glue code.
    
    Cc: Bin Liu <b-liu@xxxxxx>
    Cc: linux-usb@xxxxxxxxxxxxxxx
    Fixes: 92bf78b33b0b ("gpio: omap: use dynamic allocation of base")
    Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index 50b88eb23f9f8..564bf80a26212 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -10,8 +10,8 @@
 
 #include <linux/clk.h>
 #include <linux/delay.h>
-#include <linux/gpio.h>
 #include <linux/gpio/machine.h>
+#include <linux/gpio/consumer.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/irq.h>
@@ -29,13 +29,12 @@
 
 #include "common.h"
 #include "mmc.h"
+#include "usb-tusb6010.h"
 #include "soc.h"
 #include "common-board-devices.h"
 
 #define TUSB6010_ASYNC_CS	1
 #define TUSB6010_SYNC_CS	4
-#define TUSB6010_GPIO_INT	58
-#define TUSB6010_GPIO_ENABLE	0
 #define TUSB6010_DMACHAN	0x3f
 
 #define NOKIA_N810_WIMAX	(1 << 2)
@@ -62,37 +61,6 @@ static void board_check_revision(void)
 }
 
 #if IS_ENABLED(CONFIG_USB_MUSB_TUSB6010)
-/*
- * Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
- * 1.5 V voltage regulators of PM companion chip. Companion chip will then
- * provide then PGOOD signal to TUSB6010 which will release it from reset.
- */
-static int tusb_set_power(int state)
-{
-	int i, retval = 0;
-
-	if (state) {
-		gpio_set_value(TUSB6010_GPIO_ENABLE, 1);
-		msleep(1);
-
-		/* Wait until TUSB6010 pulls INT pin down */
-		i = 100;
-		while (i && gpio_get_value(TUSB6010_GPIO_INT)) {
-			msleep(1);
-			i--;
-		}
-
-		if (!i) {
-			printk(KERN_ERR "tusb: powerup failed\n");
-			retval = -ENODEV;
-		}
-	} else {
-		gpio_set_value(TUSB6010_GPIO_ENABLE, 0);
-		msleep(10);
-	}
-
-	return retval;
-}
 
 static struct musb_hdrc_config musb_config = {
 	.multipoint	= 1,
@@ -103,39 +71,36 @@ static struct musb_hdrc_config musb_config = {
 
 static struct musb_hdrc_platform_data tusb_data = {
 	.mode		= MUSB_OTG,
-	.set_power	= tusb_set_power,
 	.min_power	= 25,	/* x2 = 50 mA drawn from VBUS as peripheral */
 	.power		= 100,	/* Max 100 mA VBUS for host mode */
 	.config		= &musb_config,
 };
 
+static struct gpiod_lookup_table tusb_gpio_table = {
+	.dev_id = "musb-tusb",
+	.table = {
+		GPIO_LOOKUP("gpio-0-15", 0, "enable",
+			    GPIO_ACTIVE_HIGH),
+		GPIO_LOOKUP("gpio-48-63", 10, "int",
+			    GPIO_ACTIVE_HIGH),
+		{ }
+	},
+};
+
 static void __init n8x0_usb_init(void)
 {
 	int ret = 0;
-	static const char announce[] __initconst = KERN_INFO "TUSB 6010\n";
-
-	/* PM companion chip power control pin */
-	ret = gpio_request_one(TUSB6010_GPIO_ENABLE, GPIOF_OUT_INIT_LOW,
-			       "TUSB6010 enable");
-	if (ret != 0) {
-		printk(KERN_ERR "Could not get TUSB power GPIO%i\n",
-		       TUSB6010_GPIO_ENABLE);
-		return;
-	}
-	tusb_set_power(0);
 
+	gpiod_add_lookup_table(&tusb_gpio_table);
 	ret = tusb6010_setup_interface(&tusb_data, TUSB6010_REFCLK_19, 2,
-					TUSB6010_ASYNC_CS, TUSB6010_SYNC_CS,
-					TUSB6010_GPIO_INT, TUSB6010_DMACHAN);
+				       TUSB6010_ASYNC_CS, TUSB6010_SYNC_CS,
+				       TUSB6010_DMACHAN);
 	if (ret != 0)
-		goto err;
+		return;
 
-	printk(announce);
+	pr_info("TUSB 6010\n");
 
 	return;
-
-err:
-	gpio_free(TUSB6010_GPIO_ENABLE);
 }
 #else
 
diff --git a/arch/arm/mach-omap2/usb-tusb6010.c b/arch/arm/mach-omap2/usb-tusb6010.c
index 18fa52f828dc7..b46c254c2bc41 100644
--- a/arch/arm/mach-omap2/usb-tusb6010.c
+++ b/arch/arm/mach-omap2/usb-tusb6010.c
@@ -11,12 +11,12 @@
 #include <linux/errno.h>
 #include <linux/delay.h>
 #include <linux/platform_device.h>
-#include <linux/gpio.h>
 #include <linux/export.h>
 #include <linux/platform_data/usb-omap.h>
 
 #include <linux/usb/musb.h>
 
+#include "usb-tusb6010.h"
 #include "gpmc.h"
 
 static u8		async_cs, sync_cs;
@@ -132,10 +132,6 @@ static struct resource tusb_resources[] = {
 	{ /* Synchronous access */
 		.flags	= IORESOURCE_MEM,
 	},
-	{ /* IRQ */
-		.name	= "mc",
-		.flags	= IORESOURCE_IRQ,
-	},
 };
 
 static u64 tusb_dmamask = ~(u32)0;
@@ -154,9 +150,9 @@ static struct platform_device tusb_device = {
 
 /* this may be called only from board-*.c setup code */
 int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
-		unsigned ps_refclk, unsigned waitpin,
-		unsigned async, unsigned sync,
-		unsigned irq, unsigned dmachan)
+		unsigned int ps_refclk, unsigned int waitpin,
+		unsigned int async, unsigned int sync,
+		unsigned int dmachan)
 {
 	int		status;
 	static char	error[] __initdata =
@@ -192,14 +188,6 @@ int __init tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
 	if (status < 0)
 		return status;
 
-	/* IRQ */
-	status = gpio_request_one(irq, GPIOF_IN, "TUSB6010 irq");
-	if (status < 0) {
-		printk(error, 3, status);
-		return status;
-	}
-	tusb_resources[2].start = gpio_to_irq(irq);
-
 	/* set up memory timings ... can speed them up later */
 	if (!ps_refclk) {
 		printk(error, 4, status);
diff --git a/arch/arm/mach-omap2/usb-tusb6010.h b/arch/arm/mach-omap2/usb-tusb6010.h
new file mode 100644
index 0000000000000..d210ff6238c26
--- /dev/null
+++ b/arch/arm/mach-omap2/usb-tusb6010.h
@@ -0,0 +1,12 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __USB_TUSB6010_H
+#define __USB_TUSB6010_H
+
+extern int __init tusb6010_setup_interface(
+		struct musb_hdrc_platform_data *data,
+		unsigned int ps_refclk, unsigned int waitpin,
+		unsigned int async_cs, unsigned int sync_cs,
+		unsigned int dmachan);
+
+#endif /* __USB_TUSB6010_H */
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index 648bb6021c5ef..dc773f4f6df2d 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -2330,7 +2330,6 @@ musb_init_controller(struct device *dev, int nIrq, void __iomem *ctrl)
 
 	spin_lock_init(&musb->lock);
 	spin_lock_init(&musb->list_lock);
-	musb->board_set_power = plat->set_power;
 	musb->min_power = plat->min_power;
 	musb->ops = plat->platform_ops;
 	musb->port_mode = plat->mode;
diff --git a/drivers/usb/musb/musb_core.h b/drivers/usb/musb/musb_core.h
index b7588d11cfc59..91b5b6b66f963 100644
--- a/drivers/usb/musb/musb_core.h
+++ b/drivers/usb/musb/musb_core.h
@@ -352,8 +352,6 @@ struct musb {
 	u16 epmask;
 	u8 nr_endpoints;
 
-	int			(*board_set_power)(int state);
-
 	u8			min_power;	/* vbus for periph, in mA/2 */
 
 	enum musb_mode		port_mode;
diff --git a/drivers/usb/musb/tusb6010.c b/drivers/usb/musb/tusb6010.c
index 5609b4e84d40a..b5ba713d08592 100644
--- a/drivers/usb/musb/tusb6010.c
+++ b/drivers/usb/musb/tusb6010.c
@@ -11,6 +11,8 @@
  *   interface.
  */
 
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -30,6 +32,8 @@ struct tusb6010_glue {
 	struct device		*dev;
 	struct platform_device	*musb;
 	struct platform_device	*phy;
+	struct gpio_desc	*enable;
+	struct gpio_desc	*intpin;
 };
 
 static void tusb_musb_set_vbus(struct musb *musb, int is_on);
@@ -1021,16 +1025,29 @@ static void tusb_setup_cpu_interface(struct musb *musb)
 
 static int tusb_musb_start(struct musb *musb)
 {
+	struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
 	void __iomem	*tbase = musb->ctrl_base;
-	int		ret = 0;
 	unsigned long	flags;
 	u32		reg;
+	int		i;
 
-	if (musb->board_set_power)
-		ret = musb->board_set_power(1);
-	if (ret != 0) {
-		printk(KERN_ERR "tusb: Cannot enable TUSB6010\n");
-		return ret;
+	/*
+	 * Enable or disable power to TUSB6010. When enabling, turn on 3.3 V and
+	 * 1.5 V voltage regulators of PM companion chip. Companion chip will then
+	 * provide then PGOOD signal to TUSB6010 which will release it from reset.
+	 */
+	gpiod_set_value(glue->enable, 1);
+	msleep(1);
+
+	/* Wait for 100ms until TUSB6010 pulls INT pin down */
+	i = 100;
+	while (i && gpiod_get_value(glue->intpin)) {
+		msleep(1);
+		i--;
+	}
+	if (!i) {
+		pr_err("tusb: Powerup respones failed\n");
+		return -ENODEV;
 	}
 
 	spin_lock_irqsave(&musb->lock, flags);
@@ -1083,8 +1100,8 @@ static int tusb_musb_start(struct musb *musb)
 err:
 	spin_unlock_irqrestore(&musb->lock, flags);
 
-	if (musb->board_set_power)
-		musb->board_set_power(0);
+	gpiod_set_value(glue->enable, 0);
+	msleep(10);
 
 	return -ENODEV;
 }
@@ -1158,11 +1175,13 @@ static int tusb_musb_init(struct musb *musb)
 
 static int tusb_musb_exit(struct musb *musb)
 {
+	struct tusb6010_glue *glue = dev_get_drvdata(musb->controller->parent);
+
 	del_timer_sync(&musb->dev_timer);
 	the_musb = NULL;
 
-	if (musb->board_set_power)
-		musb->board_set_power(0);
+	gpiod_set_value(glue->enable, 0);
+	msleep(10);
 
 	iounmap(musb->sync_va);
 
@@ -1218,6 +1237,15 @@ static int tusb_probe(struct platform_device *pdev)
 
 	glue->dev			= &pdev->dev;
 
+	glue->enable = devm_gpiod_get(glue->dev, "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(glue->enable))
+		return dev_err_probe(glue->dev, PTR_ERR(glue->enable),
+				     "could not obtain power on/off GPIO\n");
+	glue->intpin = devm_gpiod_get(glue->dev, "int", GPIOD_IN);
+	if (IS_ERR(glue->intpin))
+		return dev_err_probe(glue->dev, PTR_ERR(glue->intpin),
+				     "could not obtain INT GPIO\n");
+
 	pdata->platform_ops		= &tusb_ops;
 
 	usb_phy_generic_register();
@@ -1236,10 +1264,7 @@ static int tusb_probe(struct platform_device *pdev)
 	musb_resources[1].end = pdev->resource[1].end;
 	musb_resources[1].flags = pdev->resource[1].flags;
 
-	musb_resources[2].name = pdev->resource[2].name;
-	musb_resources[2].start = pdev->resource[2].start;
-	musb_resources[2].end = pdev->resource[2].end;
-	musb_resources[2].flags = pdev->resource[2].flags;
+	musb_resources[2] = DEFINE_RES_IRQ_NAMED(gpiod_to_irq(glue->intpin), "mc");
 
 	pinfo = tusb_dev_info;
 	pinfo.parent = &pdev->dev;
diff --git a/include/linux/usb/musb.h b/include/linux/usb/musb.h
index e4a3ad3c800f5..3963e55e88a31 100644
--- a/include/linux/usb/musb.h
+++ b/include/linux/usb/musb.h
@@ -99,9 +99,6 @@ struct musb_hdrc_platform_data {
 	/* (HOST or OTG) program PHY for external Vbus */
 	unsigned	extvbus:1;
 
-	/* Power the device on or off */
-	int		(*set_power)(int state);
-
 	/* MUSB configuration-specific details */
 	const struct musb_hdrc_config *config;
 
@@ -135,14 +132,4 @@ static inline int musb_mailbox(enum musb_vbus_id_status status)
 #define	TUSB6010_REFCLK_24	41667	/* psec/clk @ 24.0 MHz XI */
 #define	TUSB6010_REFCLK_19	52083	/* psec/clk @ 19.2 MHz CLKIN */
 
-#ifdef	CONFIG_ARCH_OMAP2
-
-extern int __init tusb6010_setup_interface(
-		struct musb_hdrc_platform_data *data,
-		unsigned ps_refclk, unsigned waitpin,
-		unsigned async_cs, unsigned sync_cs,
-		unsigned irq, unsigned dmachan);
-
-#endif	/* OMAP2 */
-
 #endif /* __LINUX_USB_MUSB_H */



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