linux-kernel - [PATCH RFC 1/6] ARM: pxa: Convert Spitz OHCI to GPIO descriptors

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Message-Id: <20230924-pxa-gpio-v1-1-2805b87d8894@skole.hr>
Date:   Sun, 24 Sep 2023 18:42:54 +0200
From:   Duje Mihanović <duje.mihanovic@...le.hr>
To:     Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Russell King <linux@...linux.org.uk>,
        Alan Stern <stern@...land.harvard.edu>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Andy Shevchenko <andy@...nel.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org, linux-gpio@...r.kernel.org,
        Duje Mihanović <duje.mihanovic@...le.hr>
Subject: [PATCH RFC 1/6] ARM: pxa: Convert Spitz OHCI to GPIO descriptors

Sharp's Spitz board still uses the legacy GPIO interface for controlling
a GPIO pin related to the USB host controller.

Convert this function to use the new GPIO descriptor interface.

Signed-off-by: Duje Mihanović <duje.mihanovic@...le.hr>
---
 arch/arm/mach-pxa/spitz.c      | 13 ++++++-------
 drivers/usb/host/ohci-pxa27x.c | 10 ++++++++++
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/arch/arm/mach-pxa/spitz.c b/arch/arm/mach-pxa/spitz.c
index cc691b199429..535e2b2e997b 100644
--- a/arch/arm/mach-pxa/spitz.c
+++ b/arch/arm/mach-pxa/spitz.c
@@ -649,23 +649,22 @@ static inline void spitz_mmc_init(void) {}
  * USB Host
  ******************************************************************************/
 #if defined(CONFIG_USB_OHCI_HCD) || defined(CONFIG_USB_OHCI_HCD_MODULE)
+GPIO_LOOKUP_SINGLE(spitz_usb_host_gpio_table, "pxa27x-ohci", "gpio-pxa",
+		SPITZ_GPIO_USB_HOST, "usb-host", GPIO_ACTIVE_LOW);
+
 static int spitz_ohci_init(struct device *dev)
 {
-	int err;
-
-	err = gpio_request(SPITZ_GPIO_USB_HOST, "USB_HOST");
-	if (err)
-		return err;
+	gpiod_add_lookup_table(&spitz_usb_host_gpio_table);
 
 	/* Only Port 2 is connected, setup USB Port 2 Output Control Register */
 	UP2OCR = UP2OCR_HXS | UP2OCR_HXOE | UP2OCR_DPPDE | UP2OCR_DMPDE;
 
-	return gpio_direction_output(SPITZ_GPIO_USB_HOST, 1);
+	return 0;
 }
 
 static void spitz_ohci_exit(struct device *dev)
 {
-	gpio_free(SPITZ_GPIO_USB_HOST);
+	gpiod_remove_lookup_table(&spitz_usb_host_gpio_table);
 }
 
 static struct pxaohci_platform_data spitz_ohci_platform_data = {
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index 357d9aee38a3..0cf222f9d64b 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -121,6 +121,7 @@ struct pxa27x_ohci {
 	void __iomem	*mmio_base;
 	struct regulator *vbus[3];
 	bool		vbus_enabled[3];
+	struct gpio_desc *usb_host;
 };
 
 #define to_pxa27x_ohci(hcd)	(struct pxa27x_ohci *)(hcd_to_ohci(hcd)->priv)
@@ -447,6 +448,12 @@ static int ohci_hcd_pxa27x_probe(struct platform_device *pdev)
 	pxa_ohci = to_pxa27x_ohci(hcd);
 	pxa_ohci->clk = usb_clk;
 	pxa_ohci->mmio_base = (void __iomem *)hcd->regs;
+	pxa_ohci->usb_host = gpiod_get(&pdev->dev, "usb-host", GPIOD_OUT_LOW);
+	if (IS_ERR(pxa_ohci->usb_host)) {
+		dev_warn(&pdev->dev, "failed to get USB host GPIO with %d\n",
+				(int) pxa_ohci->usb_host);
+		pxa_ohci->usb_host = NULL;
+	}
 
 	for (i = 0; i < 3; ++i) {
 		char name[6];
@@ -512,6 +519,9 @@ static void ohci_hcd_pxa27x_remove(struct platform_device *pdev)
 	for (i = 0; i < 3; ++i)
 		pxa27x_ohci_set_vbus_power(pxa_ohci, i, false);
 
+	if (pxa_ohci->usb_host)
+		gpiod_put(pxa_ohci->usb_host);
+
 	usb_put_hcd(hcd);
 }
 

-- 
2.42.0