[U-Boot] [PATCH v5 4/6] mvebu: usb: xhci: Add VBUS regulator supply to the host driver

Konstantin Porotchkin kostap at marvell.com
Thu Feb 9 16:43:05 UTC 2017 

On 02/09/2017 06:15 PM, Marek Vasut wrote:
> On 02/09/2017 04:54 PM, Konstantin Porotchkin wrote:
> >
> > On 02/09/2017 05:36 PM, Marek Vasut wrote:
> >> On 02/09/2017 04:30 PM, Konstantin Porotchkin wrote:
> >>>
> >>>
> >>> On 02/09/2017 03:37 PM, Marek Vasut wrote:
> >>>> On 02/09/2017 12:32 PM, kostap at marvell.com wrote:
> >>>>> From: Konstantin Porotchkin <kostap at marvell.com>
> >>>>>
> >>>>> The USB device should linked to VBUS regulator through "vbus-supply"
> >>>>> DTS property.
> >>>>> This patch adds handling for "vbus-supply" property inside the USB
> >>>>> device entry for turning on the VBUS regulator upon the host adapter
> >>>>> probe.
> >>>>>
> >>>>> Signed-off-by: Konstantin Porotchkin <kostap at marvell.com>
> >>>>> Cc: Stefan Roese <sr at denx.de>
> >>>>> Cc: Marek Vasut <marex at denx.de>
> >>>>> Cc: Nadav Haklai <nadavh at marvell.com>
> >>>>> Cc: Neta Zur Hershkovits <neta at marvell.com>
> >>>>> Cc: Igal Liberman <igall at marvell.com>
> >>>>> Cc: Haim Boot <hayim at marvell.com>
> >>>>> ---
> >>>>> Changes for v5:
> >>>>> - Extended clocks description in documentation
> >>>>> - Removed print for regulator not found case
> >>>>>
> >>>>>  doc/device-tree-bindings/usb/marvell.xhci-usb.txt | 29
> >>>>> +++++++++++++++++++++++
> >>>>>  drivers/usb/host/Kconfig                          |  1 +
> >>>>>  drivers/usb/host/xhci-mvebu.c                     | 13 +++++++++-
> >>>>>  3 files changed, 42 insertions(+), 1 deletion(-)
> >>>>>  create mode 100644 doc/device-tree-bindings/usb/marvell.xhci-usb.txt
> >>>>>
> >>>>> diff --git a/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
> >>>>> b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
> >>>>> new file mode 100644
> >>>>> index 0000000..6cc370c
> >>>>> --- /dev/null
> >>>>> +++ b/doc/device-tree-bindings/usb/marvell.xhci-usb.txt
> >>>>> @@ -0,0 +1,29 @@
> >>>>> +Marvell SOC USB controllers
> >>>>> +
> >>>>> +This controller is integrated in Armada 3700/8K.
> >>>>> +It uses the same properties as a generic XHCI host controller
> >>>>> +
> >>>>> +Required properties :
> >>>>> + - compatible: should be one or more of:
> >>>>> +   - "marvell,armada3700-xhci", "generic-xhci" for Armada 37xx SoCs
> >>>>> +   - "marvell,armada-8k-xhci", "generic-xhci" for Armada A8K SoCs
> >>>>> + - reg: should contain address and length of the standard XHCI
> >>>>> +   register set for the device.
> >>>>> + - interrupts: one XHCI interrupt should be described here.
> >>>>> +
> >>>>> +Optional properties:
> >>>>> + - clocks: reference to a platform clocks that should be
> >>>>> enabled/configured
> >>>>> +   upon interface initialization. May not exist on all platforms.
> >>>>
> >>>> This is probably block clock then ?
> >>>>
> >>>> Otherwise,
> >>>> Acked-by: Marek Vasut <marex at denx.de>
> >>> Otherwise the the internal SoC clock does not require gating/muxing or
> >>> any other configuration for making this USB host adapter running.
> >>> Not sure if I understood your question well.
> >>
> >> Well,  do these clock drive the USB block or do they drive the register
> >> interface or what ?
> > This entry is generic and applicable to all XHCI controllers, so it is
> > hard to answer your question.  It supposes to be a clock that drives the
> > data transfer. It can be directly connected to the internal clock
> > generator and divider or pass though an additional gate/mux. In the last
> > case it can be inhibited or redirected.
>
> So it's a PHY clock then ? Or XHCI block clock ?
>
> marvell.xhci-usb.txt probably doesn't contain generic stuff, but marvell
> XHCI implementation specific stuff, right ?
No, in this particular case this entry is generic. That is why I proposed to remove it in the past.
For the purpose of mvebu XHCI driver this entry is not required.
In general and in Marvell case particularly, every unit is driven by some kind of internal clock.
>
> >>>>> + - vbus-supply : If present, specifies the fixed regulator to be
> >>>>> turned on
> >>>>> +   for providing power to the USB VBUS rail.
> >>>>> +
> >>>>> +Example:
> >>>>> +    cpm_usb3_0: usb3 at 500000 {
> >>>>> +        compatible = "marvell,armada-8k-xhci",
> >>>>> +                 "generic-xhci";
> >>>>> +        reg = <0x500000 0x4000>;
> >>>>> +        interrupts = <GIC_SPI 62 IRQ_TYPE_LEVEL_HIGH>;
> >>>>> +        clocks = <&cpm_syscon0 1 22>;
> >>>>> +        vbus-supply = <&reg_usb3h0_vbus>;
> >>>>> +        status = "disabled";
> >>>>> +    };
> >>>>> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> >>>>> index 5129a57..0bf8274 100644
> >>>>> --- a/drivers/usb/host/Kconfig
> >>>>> +++ b/drivers/usb/host/Kconfig
> >>>>> @@ -25,6 +25,7 @@ config USB_XHCI_MVEBU
> >>>>>      bool "MVEBU USB 3.0 support"
> >>>>>      default y
> >>>>>      depends on ARCH_MVEBU
> >>>>> +    select DM_REGULATOR
> >>>>>      help
> >>>>>        Choose this option to add support for USB 3.0 driver on mvebu
> >>>>>        SoCs, which includes Armada8K, Armada3700 and other Armada
> >>>>> diff --git a/drivers/usb/host/xhci-mvebu.c
> >>>>> b/drivers/usb/host/xhci-mvebu.c
> >>>>> index 46eb937..d880af1 100644
> >>>>> --- a/drivers/usb/host/xhci-mvebu.c
> >>>>> +++ b/drivers/usb/host/xhci-mvebu.c
> >>>>> @@ -10,6 +10,7 @@
> >>>>>  #include <dm.h>
> >>>>>  #include <fdtdec.h>
> >>>>>  #include <usb.h>
> >>>>> +#include <power/regulator.h>
> >>>>>  #include <asm/gpio.h>
> >>>>>
> >>>>>  #include "xhci.h"
> >>>>> @@ -44,12 +45,22 @@ static int xhci_usb_probe(struct udevice *dev)
> >>>>>      struct mvebu_xhci_platdata *plat = dev_get_platdata(dev);
> >>>>>      struct mvebu_xhci *ctx = dev_get_priv(dev);
> >>>>>      struct xhci_hcor *hcor;
> >>>>> -    int len;
> >>>>> +    int len, ret;
> >>>>> +    struct udevice *regulator;
> >>>>>
> >>>>>      ctx->hcd = (struct xhci_hccr *)plat->hcd_base;
> >>>>>      len = HC_LENGTH(xhci_readl(&ctx->hcd->cr_capbase));
> >>>>>      hcor = (struct xhci_hcor *)((uintptr_t)ctx->hcd + len);
> >>>>>
> >>>>> +    ret = device_get_supply_regulator(dev, "vbus-supply",
> >> &regulator);
> >>>>> +    if (!ret) {
> >>>>> +        ret = regulator_set_enable(regulator, true);
> >>>>> +        if (ret) {
> >>>>> +            printf("Failed to turn ON the VBUS regulator\n");
> >>>>> +            return ret;
> >>>>> +        }
> >>>>> +    }
> >>>>> +
> >>>>>      /* Enable USB xHCI (VBUS, reset etc) in board specific code */
> >>>>>      board_xhci_enable();
> >>>>>
> >>>>>
> >>>>
> >>>>
> >>
> >>
> >
>
>

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