diff mbox series

[v3,6/9] soc: renesas: r9a06g032-sysctrl: Handle h2mode setting based on USBF presence

Message ID 20221207162435.1001782-7-herve.codina@bootlin.com
State New
Headers
Series Add the Renesas USBF controller support |

Commit Message

Herve Codina Dec. 7, 2022, 4:24 p.m. UTC 
  The CFG_USB[H2MODE] allows to switch the USB configuration. The
configuration supported are:
  - One host and one device
or
  - Two hosts

Set CFG_USB[H2MODE] based on the USBF controller (USB device)
availability.

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
 drivers/clk/renesas/r9a06g032-clocks.c | 28 ++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Comments

Geert Uytterhoeven Dec. 8, 2022, 9:05 a.m. UTC | #1 
On Wed, Dec 7, 2022 at 5:24 PM Herve Codina <herve.codina@bootlin.com> wrote:
> The CFG_USB[H2MODE] allows to switch the USB configuration. The
> configuration supported are:
>   - One host and one device
> or
>   - Two hosts
>
> Set CFG_USB[H2MODE] based on the USBF controller (USB device)
> availability.
>
> Signed-off-by: Herve Codina <herve.codina@bootlin.com>

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
Herve Codina Dec. 13, 2022, 1:28 p.m. UTC | #2 
Hi Geert,

On Thu, 8 Dec 2022 10:05:28 +0100
Geert Uytterhoeven <geert@linux-m68k.org> wrote:

> On Wed, Dec 7, 2022 at 5:24 PM Herve Codina <herve.codina@bootlin.com> wrote:
> > The CFG_USB[H2MODE] allows to switch the USB configuration. The
> > configuration supported are:
> >   - One host and one device
> > or
> >   - Two hosts
> >
> > Set CFG_USB[H2MODE] based on the USBF controller (USB device)
> > availability.
> >
> > Signed-off-by: Herve Codina <herve.codina@bootlin.com>  
> 
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> 

Will be added in v4.

Thanks for the review,
Hervé
diff mbox series

Patch

diff --git a/drivers/clk/renesas/r9a06g032-clocks.c b/drivers/clk/renesas/r9a06g032-clocks.c
index 1488c9d6e639..8a09ba79b97f 100644
--- a/drivers/clk/renesas/r9a06g032-clocks.c
+++ b/drivers/clk/renesas/r9a06g032-clocks.c
@@ -25,6 +25,8 @@ 
 #include <linux/spinlock.h>
 #include <dt-bindings/clock/r9a06g032-sysctrl.h>
 
+#define R9A06G032_SYSCTRL_USB    0x00
+#define R9A06G032_SYSCTRL_USB_H2MODE  (1<<1)
 #define R9A06G032_SYSCTRL_DMAMUX 0xA0
 
 struct r9a06g032_gate {
@@ -919,6 +921,29 @@  static void r9a06g032_clocks_del_clk_provider(void *data)
 	of_clk_del_provider(data);
 }
 
+static void __init r9a06g032_init_h2mode(struct r9a06g032_priv *clocks)
+{
+	struct device_node *usbf_np = NULL;
+	u32 usb;
+
+	while ((usbf_np = of_find_compatible_node(usbf_np, NULL,
+						  "renesas,rzn1-usbf"))) {
+		if (of_device_is_available(usbf_np))
+			break;
+	}
+
+	usb = readl(clocks->reg + R9A06G032_SYSCTRL_USB);
+	if (usbf_np) {
+		/* 1 host and 1 device mode */
+		usb &= ~R9A06G032_SYSCTRL_USB_H2MODE;
+		of_node_put(usbf_np);
+	} else {
+		/* 2 hosts mode */
+		usb |= R9A06G032_SYSCTRL_USB_H2MODE;
+	}
+	writel(usb, clocks->reg + R9A06G032_SYSCTRL_USB);
+}
+
 static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -948,6 +973,9 @@  static int __init r9a06g032_clocks_probe(struct platform_device *pdev)
 	clocks->reg = of_iomap(np, 0);
 	if (WARN_ON(!clocks->reg))
 		return -ENOMEM;
+
+	r9a06g032_init_h2mode(clocks);
+
 	for (i = 0; i < ARRAY_SIZE(r9a06g032_clocks); ++i) {
 		const struct r9a06g032_clkdesc *d = &r9a06g032_clocks[i];
 		const char *parent_name = d->source ?