[U-Boot] [PATCH 06/21] usb: ehci: Add STi ehci support

[Patrice CHOTARD <patrice.chotard@st.com>]

Hi Simon

On 04/01/2017 06:21 AM, Simon Glass wrote:
> Hi Patrice,
>
> On 23 March 2017 at 03:59, Patrice CHOTARD <patrice.chotard@st.com> wrote:
>> Hi Simon
>>
>> On 03/22/2017 02:05 PM, Simon Glass wrote:
>>> Hi,
>>>
>>> On 17 March 2017 at 10:25,  <patrice.chotard@st.com> wrote:
>>>> From: Patrice Chotard <patrice.chotard@st.com>
>>>>
>>>> Add support for on-chip ehci controller available
>>>> on STMicrolectronics SoCs.
>>>> ehci support will be then available on both type A
>>>> USB 2.0 connectors.
>>>>
>>>> Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
>>>> ---
>>>>  drivers/usb/host/Kconfig    |  9 +++++
>>>>  drivers/usb/host/Makefile   |  1 +
>>>>  drivers/usb/host/ehci-sti.c | 91 +++++++++++++++++++++++++++++++++++++++++++++
>>>>  3 files changed, 101 insertions(+)
>>>>  create mode 100644 drivers/usb/host/ehci-sti.c
>>>>
>>>> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
>>>> index 5129a57..d66f49e 100644
>>>> --- a/drivers/usb/host/Kconfig
>>>> +++ b/drivers/usb/host/Kconfig
>>>> @@ -120,6 +120,15 @@ config USB_EHCI_MSM
>>>>           This driver supports combination of Chipidea USB controller
>>>>           and Synapsys USB PHY in host mode only.
>>>>
>>>> +config USB_EHCI_STI
>>>> +       bool "Support for STMicroelectronics on-chip EHCI USB controller"
>>>> +       depends on ARCH_STI
>>>> +       select STI_PHY_USB
>>>> +       default y
>>>> +       ---help---
>>>> +         Enables support for the on-chip EHCI controller on
>>>> +         STMicroelectronics SoCs.
>>>> +
>>>>  config USB_EHCI_ZYNQ
>>>>         bool "Support for Xilinx Zynq on-chip EHCI USB controller"
>>>>         depends on ARCH_ZYNQ
>>>> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
>>>> index 58c0cf5..303aa32 100644
>>>> --- a/drivers/usb/host/Makefile
>>>> +++ b/drivers/usb/host/Makefile
>>>> @@ -46,6 +46,7 @@ obj-$(CONFIG_USB_EHCI_MARVELL) += ehci-marvell.o
>>>>  obj-$(CONFIG_USB_EHCI_MSM) += ehci-msm.o
>>>>  obj-$(CONFIG_USB_EHCI_PCI) += ehci-pci.o
>>>>  obj-$(CONFIG_USB_EHCI_SPEAR) += ehci-spear.o
>>>> +obj-$(CONFIG_USB_EHCI_STI) += ehci-sti.o
>>>>  obj-$(CONFIG_USB_EHCI_SUNXI) += ehci-sunxi.o
>>>>  obj-$(CONFIG_USB_EHCI_TEGRA) += ehci-tegra.o
>>>>  obj-$(CONFIG_USB_EHCI_VCT) += ehci-vct.o
>>>> diff --git a/drivers/usb/host/ehci-sti.c b/drivers/usb/host/ehci-sti.c
>>>> new file mode 100644
>>>> index 0000000..89ca66a
>>>> --- /dev/null
>>>> +++ b/drivers/usb/host/ehci-sti.c
>>>> @@ -0,0 +1,91 @@
>>>> +/*
>>>> + * Copyright (c) 2017
>>>> + * Patrice Chotard <patrice.chotard@st.com>
>>>> + *
>>>> + * SPDX-License-Identifier:    GPL-2.0+
>>>> + */
>>>> +
>>>> +#include <common.h>
>>>> +#include <asm/io.h>
>>>> +#include <dm.h>
>>>> +#include <errno.h>
>>>> +#include "ehci.h"
>>>> +#include <reset-uclass.h>
>>>> +#include <usb.h>
>>>> +
>>>> +DECLARE_GLOBAL_DATA_PTR;
>>>> +
>>>> +struct sti_ehci_priv {
>>>> +       struct ehci_ctrl ctrl;
>>>> +       struct reset_ctl power_ctl;
>>>> +       struct reset_ctl softreset_ctl;
>>>> +};
>>>> +
>>>> +static int sti_ehci_probe(struct udevice *dev)
>>>> +{
>>>> +       struct sti_ehci_priv *priv = dev_get_priv(dev);
>>>> +       struct ehci_hccr *hccr = priv->ctrl.hccr;
>>>> +       struct ehci_hcor *hcor;
>>>> +       struct udevice *dev_phy;
>>>> +       int ret, phy_node;
>>>> +
>>>> +       hccr = (struct ehci_hccr *)dev_get_addr(dev);
>>>> +
>>>> +       if (hccr == (void *)FDT_ADDR_T_NONE)
>>>> +               return -EINVAL;
>>>> +
>>>> +       ret = reset_get_by_name(dev, "power", &priv->power_ctl);
>>>
>>> This is OK, but can you instead access it via a phandle in the device's node?
>>
>> Sorry i didn't get your point. Why getting it using a phandle ?
>
> I mean that generally when a device needs another device this is
> expressed by adding a phandle in the client device's node, or perhaps
> some sort of name. That way it is possible (e.g.) to specify *which*
> reset rather than hard-coding it.

Agree with you, but i get one constraint. For this ehci IP, there are 2 
resets (power and softreset). I must identify each other to be able to 
assert/deassert them in the correct order.

I checked other U-boot drivers which already used reset, and all of them 
are using reset_get_by_name().

Patrice
>
> Regards.
> Simon
>