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Message-ID: <20160401144510.GA6264@uda0271908>
Date: Fri, 1 Apr 2016 09:45:10 -0500
From: Bin Liu <b-liu@...com>
To: Kishon Vijay Abraham I <kishon@...com>
CC: David Lechner <david@...hnology.com>,
Petr Kulhavy <petr@...ix.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Russell King <linux@....linux.org.uk>,
Sekhar Nori <nsekhar@...com>,
Kevin Hilman <khilman@...nel.org>,
Alan Stern <stern@...land.harvard.edu>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Andreas Färber <afaerber@...e.de>,
Tony Lindgren <tony@...mide.com>,
Robert Jarzmik <robert.jarzmik@...e.fr>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 06/11] phy: da8xx-usb: new driver for DA8XX SoC USB PHY
Hi,
On Fri, Apr 01, 2016 at 06:46:28PM +0530, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Thursday 17 March 2016 07:56 AM, David Lechner wrote:
> > This is a new phy driver for the SoC USB controllers on the TI DA8XX
> > family of microcontrollers. The USB 1.1 PHY is just a simple on/off.
> > The USB 2.0 PHY also allows overriding the VBUS and ID pins.
> >
> > Signed-off-by: David Lechner <david@...hnology.com>
> > ---
> >
> > v2 changes: This is new patch in v2.
> >
> >
> >
> > drivers/phy/Kconfig | 9 ++
> > drivers/phy/Makefile | 1 +
> > drivers/phy/phy-da8xx-usb.c | 295 ++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 305 insertions(+)
> > create mode 100644 drivers/phy/phy-da8xx-usb.c
> >
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index 26566db..a6060ea 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -35,6 +35,15 @@ config ARMADA375_USBCLUSTER_PHY
> > depends on OF && HAS_IOMEM
> > select GENERIC_PHY
> >
> > +config PHY_DA8XX_USB
> > + tristate "TI DA8XX USB PHY Driver"
> > + depends on ARCH_DAVINCI_DA8XX
> > + select GENERIC_PHY
> > + help
> > + Enable this to support the USB PHY on DA8XX SoCs.
> > +
> > + This driver controls both the USB 1.1 PHY and the USB 2.0 PHY.
> > +
> > config PHY_DM816X_USB
> > tristate "TI dm816x USB PHY driver"
> > depends on ARCH_OMAP2PLUS
> > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> > index 24596a9..722e01c 100644
> > --- a/drivers/phy/Makefile
> > +++ b/drivers/phy/Makefile
> > @@ -5,6 +5,7 @@
> > obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> > obj-$(CONFIG_PHY_BERLIN_USB) += phy-berlin-usb.o
> > obj-$(CONFIG_PHY_BERLIN_SATA) += phy-berlin-sata.o
> > +obj-$(CONFIG_PHY_DA8XX_USB) += phy-da8xx-usb.o
> > obj-$(CONFIG_PHY_DM816X_USB) += phy-dm816x-usb.o
> > obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY) += phy-armada375-usb2.o
> > obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
> > diff --git a/drivers/phy/phy-da8xx-usb.c b/drivers/phy/phy-da8xx-usb.c
> > new file mode 100644
> > index 0000000..93a5f4d
> > --- /dev/null
> > +++ b/drivers/phy/phy-da8xx-usb.c
> > @@ -0,0 +1,295 @@
> > +/*
> > + * phy-da8xx-usb - TI DaVinci DA8XX USB PHY driver
> > + *
> > + * Copyright (C) 2016 David Lechner <david@...hnology.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > + * the Free Software Foundation; either version 2 of the License, or
> > + * (at your option) any later version.
> > + *
> > + * This program is distributed in the hope that it will be useful,
> > + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > + * GNU General Public License for more details.
> > + *
> > + */
> > +
> > +#include <linux/clk.h>
> > +#include <linux/io.h>
> > +#include <linux/of.h>
> > +#include <linux/module.h>
> > +#include <linux/phy/phy.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/usb/gadget.h>
> > +#include <linux/usb/musb.h>
> > +#include <linux/usb/otg.h>
> > +
> > +/* DA8xx CFGCHIP2 (USB PHY Control) register bits */
> > +#define PHYCLKGD (1 << 17)
> > +#define VBUSSENSE (1 << 16)
> > +#define RESET (1 << 15)
> > +#define OTGMODE_MASK (3 << 13)
> > +#define NO_OVERRIDE (0 << 13)
> > +#define FORCE_HOST (1 << 13)
> > +#define FORCE_DEVICE (2 << 13)
> > +#define FORCE_HOST_VBUS_LOW (3 << 13)
> > +#define USB1PHYCLKMUX (1 << 12)
> > +#define USB2PHYCLKMUX (1 << 11)
> > +#define PHYPWRDN (1 << 10)
> > +#define OTGPWRDN (1 << 9)
> > +#define DATPOL (1 << 8)
> > +#define USB1SUSPENDM (1 << 7)
> > +#define PHY_PLLON (1 << 6)
> > +#define SESENDEN (1 << 5)
> > +#define VBDTCTEN (1 << 4)
> > +#define REFFREQ_MASK (0xf << 0)
> > +#define REFFREQ_12MHZ (1 << 0)
> > +#define REFFREQ_24MHZ (2 << 0)
> > +#define REFFREQ_48MHZ (3 << 0)
> > +#define REFFREQ_19_2MHZ (4 << 0)
> > +#define REFFREQ_38_4MHZ (5 << 0)
> > +#define REFFREQ_13MHZ (6 << 0)
> > +#define REFFREQ_26MHZ (7 << 0)
> > +#define REFFREQ_20MHZ (8 << 0)
> > +#define REFFREQ_40MHZ (9 << 0)
> > +
> > +struct da8xx_usbphy {
> > + struct phy_provider *phy_provider;
> > + struct phy *usb11_phy;
> > + struct phy *usb20_phy;
> > + struct clk *usb11_clk;
> > + struct clk *usb20_clk;
> > + void __iomem *phy_ctrl;
> > +};
> > +
> > +static inline u32 da8xx_usbphy_readl(void __iomem *base)
> > +{
> > + return readl(base);
> > +}
> > +
> > +static inline void da8xx_usbphy_writel(void __iomem *base, u32 value)
> > +{
> > + writel(value, base);
> > +}
> > +
> > +static int da8xx_usb11_phy_init(struct phy *phy)
> > +{
> > + struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
> > + int ret;
> > + u32 val;
> > +
> > + ret = clk_prepare_enable(d_phy->usb11_clk);
> > + if (ret)
> > + return ret;
> > +
> > + val = da8xx_usbphy_readl(d_phy->phy_ctrl);
> > + val |= USB1SUSPENDM;
> > + da8xx_usbphy_writel(d_phy->phy_ctrl, val);
> > +
> > + return 0;
> > +}
> > +
> > +static int da8xx_usb11_phy_shutdown(struct phy *phy)
> > +{
> > + struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
> > + u32 val;
> > +
> > + val = da8xx_usbphy_readl(d_phy->phy_ctrl);
> > + val &= ~USB1SUSPENDM;
> > + da8xx_usbphy_writel(d_phy->phy_ctrl, val);
> > +
> > + clk_disable_unprepare(d_phy->usb11_clk);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct phy_ops da8xx_usb11_phy_ops = {
> > + .power_on = da8xx_usb11_phy_init,
> > + .power_off = da8xx_usb11_phy_shutdown,
> > + .owner = THIS_MODULE,
> > +};
> > +
> > +static int da8xx_usb20_phy_init(struct phy *phy)
> > +{
> > + struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
> > + int ret;
> > + u32 val;
> > +
> > + ret = clk_prepare_enable(d_phy->usb20_clk);
> > + if (ret)
> > + return ret;
> > +
> > + val = da8xx_usbphy_readl(d_phy->phy_ctrl);
> > + val &= ~OTGPWRDN;
> > + da8xx_usbphy_writel(d_phy->phy_ctrl, val);
> > +
> > + return 0;
> > +}
> > +
> > +static int da8xx_usb20_phy_shutdown(struct phy *phy)
> > +{
> > + struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
> > + u32 val;
> > +
> > + val = da8xx_usbphy_readl(d_phy->phy_ctrl);
> > + val |= OTGPWRDN;
> > + da8xx_usbphy_writel(d_phy->phy_ctrl, val);
> > +
> > + clk_disable_unprepare(d_phy->usb20_clk);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct phy_ops da8xx_usb20_phy_ops = {
> > + .power_on = da8xx_usb20_phy_init,
> > + .power_off = da8xx_usb20_phy_shutdown,
> > + .owner = THIS_MODULE,
> > +};
> > +
> > +int da8xx_usb20_phy_set_mode(struct phy *phy, enum musb_mode mode)
> > +{
> > + struct da8xx_usbphy *d_phy = phy_get_drvdata(phy);
> > + u32 val;
> > +
> > + val = da8xx_usbphy_readl(d_phy->phy_ctrl);
> > +
> > + val &= ~OTGMODE_MASK;
> > + switch (mode) {
> > + case MUSB_HOST: /* Force VBUS valid, ID = 0 */
> > + val |= FORCE_HOST;
> > + break;
> > + case MUSB_PERIPHERAL: /* Force VBUS valid, ID = 1 */
> > + val |= FORCE_DEVICE;
> > + break;
> > + case MUSB_OTG: /* Don't override the VBUS/ID comparators */
> > + val |= NO_OVERRIDE;
> > + break;
> > + default:
> > + return -EINVAL;
> > + }
> > +
> > + da8xx_usbphy_writel(d_phy->phy_ctrl, val);
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL_GPL(da8xx_usb20_phy_set_mode);
>
> Don't prefer export symbols from PHY driver. That'll create unnecessary
> dependencies between the controller and the PHY.
Agreed.
>
> I think it'll be better to create a new attribute and use it?
Another simpler option is to not support _set_mode() for DA8xx, and the
phy driver set the otgmode bit in probe() based on dr_mode of the
controller.
Regards,
-Bin.
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