RE: [PATCH v2 9/9] dts: Add usb2phy to Exynos 5250

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Hi,

> From: Vivek Gautam [mailto:gautamvivek1987@xxxxxxxxx]
> Sent: Thursday, December 26, 2013 11:32 AM
> 
> Hi Kamil,
> 
> 
> On Fri, Dec 20, 2013 at 6:54 PM, Kamil Debski <k.debski@xxxxxxxxxxx>
> wrote:
> > Add support to PHY of USB2 of the Exynos 5250 SoC.
> >
> > Signed-off-by: Kamil Debski <k.debski@xxxxxxxxxxx>
> > ---
> >  arch/arm/boot/dts/exynos5250.dtsi |   33 ++++++++++++-------
> >  drivers/phy/phy-exynos5250-usb2.c |   64
> +++++++++++++++++++++++++++++++++----
> >  2 files changed, 78 insertions(+), 19 deletions(-)
> >
> > diff --git a/arch/arm/boot/dts/exynos5250.dtsi
> > b/arch/arm/boot/dts/exynos5250.dtsi
> > index 2f264ad..922e0ed 100644
> > --- a/arch/arm/boot/dts/exynos5250.dtsi
> > +++ b/arch/arm/boot/dts/exynos5250.dtsi
> > @@ -163,6 +163,11 @@
> >                 interrupts = <0 47 0>;
> >         };
> >
> > +       sys_syscon: syscon@10040000 {
> > +               compatible = "samsung,exynos5250-sys", "syscon";
> > +               reg = <0x10050000 0x5000>;
> > +       };
> > +
> >         pmu_syscon: syscon@10040000 {
> >                 compatible = "samsung,exynos5250-pmu", "syscon";
> >                 reg = <0x10040000 0x5000>; @@ -505,6 +510,14 @@
> >
> >                 clocks = <&clock 285>;
> >                 clock-names = "usbhost";
> > +               #address-cells = <1>;
> > +               #size-cells = <0>;
> > +               port@0 {
> > +                       reg = <0>;
> > +                       phys = <&usb2_phy 1>;
> > +                       phy-names = "host";
> > +                       status = "ok";
> > +               };
> >         };
> >
> >         usb@12120000 {
> > @@ -516,19 +529,15 @@
> >                 clock-names = "usbhost";
> >         };
> >
> > -       usb2_phy: usbphy@12130000 {
> > -               compatible = "samsung,exynos5250-usb2phy";
> > +       usb2_phy: phy@12130000 {
> > +               compatible = "samsung,exynos5250-usb2-phy";
> >                 reg = <0x12130000 0x100>;
> > -               clocks = <&clock 1>, <&clock 285>;
> > -               clock-names = "ext_xtal", "usbhost";
> > -               #address-cells = <1>;
> > -               #size-cells = <1>;
> > -               ranges;
> > -
> > -               usbphy-sys {
> > -                       reg = <0x10040704 0x8>,
> > -                             <0x10050230 0x4>;
> > -               };
> > +               clocks = <&clock 285>, <&clock 1>, <&clock 1>,
> <&clock 1>,
> > +
> <&clock 1>;
> > +               clock-names = "phy", "device", "host", "hsic0",
> "hsic1";
> > +               #phy-cells = <1>;
> > +               samsung,sysreg-phandle = <&sys_syscon>;
> > +               samsung,pmureg-phandle = <&pmu_syscon>;
> >         };
> >
> >         amba {
> > diff --git a/drivers/phy/phy-exynos5250-usb2.c
> > b/drivers/phy/phy-exynos5250-usb2.c
> > index b9b3b98..337bf82 100644
> > --- a/drivers/phy/phy-exynos5250-usb2.c
> > +++ b/drivers/phy/phy-exynos5250-usb2.c
> 
> Separate patches for dt and driver ?
> I think you wanted to move these changes to :
> [PATCH v5 7/9] phy: Add Exynos 5250 support to the Exynos USB 2.0 PHY
> driver

Good point. I am planning to reorganise this patchset to prevent breaking
git bisect. I wanted to wait for more comments to this version, so I could
address any issues that may be reported.

> 
> > @@ -58,7 +58,13 @@
> >  #define EXYNOS_5250_HOSTPHYCTRL2                       0x20
> 
> Shouldn't we leave the naming as EXYNOS_5250_HSICPHYCTRL2 instead of
> EXYNOS_5250_HOSTPHYCTRL2 ? That will go in sync with the user-manual
> too.
> and similar for EXYNOS_5250_HOSTPHYCTRL1 and below bit definitions too
> ?

Thank you for pointing this out.

> >
> >  #define EXYNOS_5250_HOSTPHYCTRLX_REFCLKSEL_MASK                (0x3
> << 23)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKSEL_DEFAULT     (0x2 << 23)
> >  #define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_MASK                (0x7f
> << 16)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_12          (0x24 << 16)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_15          (0x1c << 16)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_16          (0x1a << 16)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_19_2                (0x15
> << 16)
> > +#define EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_20          (0x14 << 16)
> >  #define EXYNOS_5250_HOSTPHYCTRLX_SIDDQ                 BIT(6)
> >  #define EXYNOS_5250_HOSTPHYCTRLX_FORCESLEEP            BIT(5)
> >  #define EXYNOS_5250_HOSTPHYCTRLX_FORCESUSPEND          BIT(4)
> > @@ -191,13 +197,14 @@ static void exynos5250_isol(struct
> samsung_usb2_phy_instance *inst, bool on)
> >         regmap_update_bits(drv->reg_pmu, offset, mask, on ? 0 :
> mask);
> > }
> >
> > -static void exynos5250_phy_pwr(struct samsung_usb2_phy_instance
> > *inst, bool on)
> > +static int exynos5250_power_on(struct samsung_usb2_phy_instance
> > +*inst)
> 
> void ? we really don't have much to return in this function.

Initially the idea was to enable the return of an error code. However,
I see that for all currently supported SoCs the ops always returns 0.
So I will consider switching to void.

> 
> >  {
> >         struct samsung_usb2_phy_driver *drv = inst->drv;
> >         u32 ctrl0;
> >         u32 otg;
> >         u32 ehci;
> >         u32 ohci;
> > +       u32 hsic;
> >
> >         switch (inst->cfg->id) {
> >         case EXYNOS5250_DEVICE:
> > @@ -234,6 +241,8 @@ static void exynos5250_phy_pwr(struct
> > samsung_usb2_phy_instance *inst, bool on)
> >
> >                 break;
> >         case EXYNOS5250_HOST:
> > +       case EXYNOS5250_HSIC0:
> > +       case EXYNOS5250_HSIC1:
> >                 /* Host registers configuration */
> >                 ctrl0 = readl(drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL0);
> >                 /* The clock */
> > @@ -279,6 +288,18 @@ static void exynos5250_phy_pwr(struct
> samsung_usb2_phy_instance *inst, bool on)
> >                         EXYNOS_5250_USBOTGSYS_LINK_SW_RST_UOTG |
> >                         EXYNOS_5250_USBOTGSYS_PHYLINK_SW_RESET);
> >
> > +               /* HSIC phy configuration */
> > +               hsic = (EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_12 |
> > +
> EXYNOS_5250_HOSTPHYCTRLX_REFCLKSEL_DEFAULT |
> > +                               EXYNOS_5250_HOSTPHYCTRLX_PHYSWRST);
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL1);
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL2);
> > +               udelay(10);
> > +               hsic &= ~EXYNOS_5250_HOSTPHYCTRLX_PHYSWRST;
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL1);
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL2);
> > +               udelay(80);
> > +
> >                 /* Enable EHCI DMA burst */
> >                 ehci = readl(drv->reg_phy +
> EXYNOS_5250_HOSTEHCICTRL);
> >                 ehci |= EXYNOS_5250_HOSTEHCICTRL_ENAINCRXALIGN | @@
> > -295,12 +316,7 @@ static void exynos5250_phy_pwr(struct
> > samsung_usb2_phy_instance *inst, bool on)
> >
> >                 break;
> >         }
> > -}
> > -
> > -static int exynos5250_power_on(struct samsung_usb2_phy_instance
> > *inst) -{
> >         inst->enabled = 1;
> > -       exynos5250_phy_pwr(inst, 1);
> >         exynos5250_isol(inst, 0);
> >
> >         return 0;
> > @@ -308,9 +324,43 @@ static int exynos5250_power_on(struct
> > samsung_usb2_phy_instance *inst)
> >
> >  static int exynos5250_power_off(struct samsung_usb2_phy_instance
> > *inst)
> 
> ditto
> 
> >  {
> > +       struct samsung_usb2_phy_driver *drv = inst->drv;
> > +       u32 ctrl0;
> > +       u32 otg;
> > +       u32 hsic;
> > +
> >         inst->enabled = 0;
> >         exynos5250_isol(inst, 1);
> > -       exynos5250_phy_pwr(inst, 0);
> > +
> > +       switch (inst->cfg->id) {
> > +       case EXYNOS5250_DEVICE:
> > +               otg = readl(drv->reg_phy + EXYNOS_5250_USBOTGSYS);
> > +               otg |= (EXYNOS_5250_USBOTGSYS_FORCE_SUSPEND |
> > +                       EXYNOS_5250_USBOTGSYS_SIDDQ_UOTG |
> > +                       EXYNOS_5250_USBOTGSYS_FORCE_SLEEP);
> > +               writel(otg, drv->reg_phy + EXYNOS_5250_USBOTGSYS);
> > +               break;
> > +       case EXYNOS5250_HOST:
> > +               ctrl0 = readl(drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL0);
> > +               ctrl0 |= (EXYNOS_5250_HOSTPHYCTRL0_SIDDQ |
> > +                               EXYNOS_5250_HOSTPHYCTRL0_FORCESUSPEND
> |
> > +                               EXYNOS_5250_HOSTPHYCTRL0_FORCESLEEP |
> > +                               EXYNOS_5250_HOSTPHYCTRL0_PHYSWRST |
> > +
> EXYNOS_5250_HOSTPHYCTRL0_PHYSWRSTALL);
> > +               writel(ctrl0, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL0);
> > +               break;
> > +       case EXYNOS5250_HSIC0:
> > +       case EXYNOS5250_HSIC1:
> > +               hsic = (EXYNOS_5250_HOSTPHYCTRLX_REFCLKDIV_12 |
> > +
> EXYNOS_5250_HOSTPHYCTRLX_REFCLKSEL_DEFAULT |
> > +                               EXYNOS_5250_HOSTPHYCTRLX_SIDDQ |
> > +                               EXYNOS_5250_HOSTPHYCTRLX_FORCESLEEP |
> > +                               EXYNOS_5250_HOSTPHYCTRLX_FORCESUSPEND
> > +                               );
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL1);
> > +               writel(hsic, drv->reg_phy +
> EXYNOS_5250_HOSTPHYCTRL2);
> > +               break;
> > +       }
> >
> >         return 0;
> >  }
> > --
> > 1.7.9.5
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe
> > linux-samsung-soc" in the body of a message to
> > majordomo@xxxxxxxxxxxxxxx More majordomo info at
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> 
> 
> 
> --
> Best Regards
> Vivek Gautam
> Samsung R&D Institute, Bangalore
> India

Best wishes,
-- 
Kamil Debski
Samsung R&D Institute Poland

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