linux-kernel - Re: [PATCH v2 1/4] usb: phy: phy-omap-control: Add API to power and wakeup

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Message-ID: <20130729142517.GA827@linutronix.de>
Date:	Mon, 29 Jul 2013 16:25:17 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	George Cherian <george.cherian@...com>
Cc:	linux-usb@...r.kernel.org, balbi@...com,
	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	linux-omap@...r.kernel.org, kishon@...com
Subject: Re: [PATCH v2 1/4] usb: phy: phy-omap-control: Add API to power
 and wakeup

* George Cherian | 2013-07-19 18:04:34 [+0530]:

>diff --git a/drivers/usb/phy/phy-omap-control.c b/drivers/usb/phy/phy-omap-control.c
>index 1419ced..4f2502c 100644
>--- a/drivers/usb/phy/phy-omap-control.c
>+++ b/drivers/usb/phy/phy-omap-control.c
>@@ -46,6 +46,73 @@ struct device *omap_get_control_dev(void)
> EXPORT_SYMBOL_GPL(omap_get_control_dev);
> 
> /**
>+ * omap_control_am335x_phy_wkup - PHY wakeup on/off  using control
>+ *	module
>+ * @dev: the control module device
>+ * @on: 0 to off and 1 to on PHY wakeup feature
>+ * @id: phy id 0 or 1 for phy instance 0 and 1 repectively
>+ *
>+ * AMXXXX PHY driver should call this API to enable or disable PHY wakeup.
>+ */
>+void omap_control_am335x_phy_wkup(struct device *dev, bool on, u8 id)
>+{
>+	u32 val;
>+	u32 *phy_wkup_reg;
>+	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
>+
>+	if (control_usb->type != OMAP_CTRL_DEV_TYPE3 || id < 0 || id > 1)
>+		return;
>+
>+	phy_wkup_reg = control_usb->dev_conf + AM335X_USB_WKUP_OFFSET;
>+	val = readl(phy_wkup_reg);

Where do you get the memory from? In the DT patches I've made I export
one memory space of 8 bytes for each phy. This memory space applies
directly to the on/off register. I didn't export the register for wakeup
so far since I had no idea how this will be used.
So how do you get your re-mapped memory here?

>+
>+	if (on)
>+		val |= id ? AM335X_USB1_WKUP_CTRL_ENABLE :
>+				AM335X_USB0_WKUP_CTRL_ENABLE;
>+	 else
>+		val &= id ? ~AM335X_USB1_WKUP_CTRL_ENABLE :
>+				~AM335X_USB0_WKUP_CTRL_ENABLE;
>+
>+
>+	writel(val, phy_wkup_reg);
>+}
>+EXPORT_SYMBOL_GPL(omap_control_am335x_phy_wkup);

Sebastian
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