On Wed, Nov 27, 2013 at 02:21:52PM +0530, Kishon Vijay Abraham I wrote:
> Hi,
>
> On Monday 25 November 2013 11:46 PM, Matt Porter wrote:
> > Add a driver for the internal Broadcom Kona USB 2.0 PHY found
> > on the BCM281xx family of SoCs.
> >
> > Signed-off-by: Matt Porter <matt.porter@xxxxxxxxxx>
> > ---
> > drivers/phy/Kconfig | 6 ++
> > drivers/phy/Makefile | 1 +
> > drivers/phy/phy-bcm-kona-usb2.c | 158 ++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 165 insertions(+)
> > create mode 100644 drivers/phy/phy-bcm-kona-usb2.c
> >
> > diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> > index a344f3d..2e87fa8 100644
> > --- a/drivers/phy/Kconfig
> > +++ b/drivers/phy/Kconfig
> > @@ -51,4 +51,10 @@ config PHY_EXYNOS_DP_VIDEO
> > help
> > Support for Display Port PHY found on Samsung EXYNOS SoCs.
> >
> > +config BCM_KONA_USB2_PHY
> > + tristate "Broadcom Kona USB2 PHY Driver"
> > + depends on GENERIC_PHY
> > + help
> > + Enable this to support the Broadcom Kona USB 2.0 PHY.
> > +
> > endmenu
> > diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> > index d0caae9..c447f1a 100644
> > --- a/drivers/phy/Makefile
> > +++ b/drivers/phy/Makefile
> > @@ -3,6 +3,7 @@
> > #
> >
> > obj-$(CONFIG_GENERIC_PHY) += phy-core.o
> > +obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy-bcm-kona-usb2.o
> > obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o
> > obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o
> > obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o
> > diff --git a/drivers/phy/phy-bcm-kona-usb2.c b/drivers/phy/phy-bcm-kona-usb2.c
> > new file mode 100644
> > index 0000000..2c54fb8
> > --- /dev/null
> > +++ b/drivers/phy/phy-bcm-kona-usb2.c
> > @@ -0,0 +1,158 @@
> > +/*
> > + * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
> > + *
> > + * Copyright (C) 2013 Linaro Limited
> > + * Matt Porter <matt.porter@xxxxxxxxxx>
> > + *
> > + * This software is licensed under the terms of the GNU General Public
> > + * License version 2, as published by the Free Software Foundation, and
> > + * may be copied, distributed, and modified under those terms.
> > + *
> > + * 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/module.h>
> > +#include <linux/of.h>
> > +#include <linux/delay.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/clk.h>
> > +#include <linux/phy/phy.h>
>
> arrange the headers in alphabetical order so that it's easy while adding new
> headers. Just my preference.
yeah, same here. just development creep that I will address.
> > +
> > +#define OTGCTL (0)
> > +#define OTGCTL_OTGSTAT2 (1 << 31)
> > +#define OTGCTL_OTGSTAT1 (1 << 30)
> > +#define OTGCTL_PRST_N_SW (1 << 11)
> > +#define OTGCTL_HRESET_N (1 << 10)
> > +#define OTGCTL_UTMI_LINE_STATE1 (1 << 9)
> > +#define OTGCTL_UTMI_LINE_STATE0 (1 << 8)
> > +
> > +#define P1CTL (8)
> > +#define P1CTL_SOFT_RESET (1 << 1)
> > +#define P1CTL_NON_DRIVING (1 << 0)
>
> you can use BIT() instead.
will do
> > +
> > +struct bcm_kona_usb {
> > + void __iomem *regs;
> > +};
> > +
> > +static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
> > +{
> > + u32 val;
> > +
> > + val = readl(phy->regs + OTGCTL);
> > + if (on) {
> > + /* Configure and power PHY */
> > + val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
> > + OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
> > + val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
> > + } else {
> > + val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
> > + }
> > + writel(val, phy->regs + OTGCTL);
> > +}
> > +
> > +static int bcm_kona_usb_phy_init(struct phy *gphy)
> > +{
> > + struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
> > + u32 val;
> > +
> > + /* Soft reset PHY */
> > + val = readl(phy->regs + P1CTL);
> > + val &= ~P1CTL_NON_DRIVING;
> > + val |= P1CTL_SOFT_RESET;
> > + writel(val, phy->regs + P1CTL);
> > + writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
> > + /* Reset needs to be asserted for 2ms */
> > + mdelay(2);
> > + writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
> > +
> > + return 0;
> > +}
> > +
> > +static int bcm_kona_usb_phy_power_on(struct phy *gphy)
> > +{
> > + struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
> > +
> > + bcm_kona_usb_phy_power(phy, 1);
> > +
> > + return 0;
> > +}
> > +
> > +static int bcm_kona_usb_phy_power_off(struct phy *gphy)
> > +{
> > + struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
> > +
> > + bcm_kona_usb_phy_power(phy, 0);
> > +
> > + return 0;
> > +}
> > +
> > +static struct phy_ops ops = {
> > + .init = bcm_kona_usb_phy_init,
> > + .power_on = bcm_kona_usb_phy_power_on,
> > + .power_off = bcm_kona_usb_phy_power_off,
> > + .owner = THIS_MODULE,
>
> owner is aligned differently..
ok
> > +};
> > +
> > +static int bcm_kona_usb2_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct bcm_kona_usb *phy;
> > + struct resource *res;
> > + struct phy *gphy;
> > + struct phy_provider *phy_provider;
> > +
> > + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
> > + if (!phy)
> > + return -ENOMEM;
> > +
> > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > + phy->regs = devm_ioremap_resource(&pdev->dev, res);
> > + if (IS_ERR(phy->regs))
> > + return PTR_ERR(phy->regs);
> > +
> > + platform_set_drvdata(pdev, phy);
> > +
> > + phy_provider = devm_of_phy_provider_register(dev,
> > + of_phy_simple_xlate);
> > + if (IS_ERR(phy_provider))
> > + return PTR_ERR(phy_provider);
> > +
> > + gphy = devm_phy_create(dev, &ops, NULL);
> > + if (IS_ERR(gphy))
> > + return PTR_ERR(gphy);
> > +
> > + /* The Kona PHY supports an 8-bit wide UTMI interface */
> > + phy_set_bus_width(gphy, 8);
> > +
> > + phy_set_drvdata(gphy, phy);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
> > + { .compatible = "brcm,kona-usb2-phy" },
> > + { /* sentinel */ }
> > +};
> > +
> > +MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
> > +
> > +static struct platform_driver bcm_kona_usb2_driver = {
> > + .probe = bcm_kona_usb2_probe,
> > + .driver = {
> > + .name = "bcm-kona-usb2",
> > + .owner = THIS_MODULE,
> > + .of_match_table = bcm_kona_usb2_dt_ids,
> > + },
> > +};
> > +
> > +module_platform_driver(bcm_kona_usb2_driver);
> > +
> > +MODULE_ALIAS("platform:bcm-kona-usb2");
> > +MODULE_AUTHOR("Matt Porter <matt.porter@xxxxxxxxxx>");
> > +MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
> > +MODULE_LICENSE("GPL v2");
> >
> Apart from those comments, this patch looks good.
Ok, thanks much for all the reviews.
-Matt
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