On Mon, May 19, 2025 at 07:09:06AM +0000, Michael Graichen wrote:
> This adds support to use the USB interface on Zynq-7000 SoC.
>
> Signed-off-by: Michael Graichen <michael.graic...@hotmail.com>
> ---
> drivers/usb/host/Kconfig | 8 ++++++++
> drivers/usb/host/Makefile | 1 +
> drivers/usb/host/ehci-zynq.c | 36 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 45 insertions(+)
> create mode 100644 drivers/usb/host/ehci-zynq.c
>
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index d38b4dcac4..812270f869 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -14,6 +14,14 @@ config USB_EHCI_ATMEL
> select USB_OHCI_AT91
> bool "Atmel EHCI driver"
>
> +config USB_EHCI_ZYNQ
> + bool "Support for Xilinx Zynq on-chip EHCI USB controller"
> + depends on ARCH_ZYNQ
> + select USB_EHCI
Please use "depends on USB_EHCI" rather than selecting it.
> + select USB_ULPI
> + help
> + Enable support for Zynq on-chip EHCI USB controller
> +
> config USB_OHCI
> bool "OHCI driver"
> depends on !MMU && HAS_DMA
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index e55dff4580..cbddfbe923 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -2,6 +2,7 @@
> obj-$(CONFIG_USB_EHCI) += ehci-hcd.o
> obj-$(CONFIG_USB_EHCI_OMAP) += ehci-omap.o
> obj-$(CONFIG_USB_EHCI_ATMEL) += ehci-atmel.o
> +obj-$(CONFIG_USB_EHCI_ZYNQ) += ehci-zynq.o
> obj-$(CONFIG_USB_OHCI) += ohci-hcd.o
> obj-$(CONFIG_USB_OHCI_AT91) += ohci-at91.o
> obj-$(CONFIG_USB_XHCI) += xhci.o xhci-mem.o xhci-ring.o
> diff --git a/drivers/usb/host/ehci-zynq.c b/drivers/usb/host/ehci-zynq.c
> new file mode 100644
> index 0000000000..f08e9a3c5c
> --- /dev/null
> +++ b/drivers/usb/host/ehci-zynq.c
> @@ -0,0 +1,36 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * USB Low level initialization(Specific to Zynq 7000)
> + */
> +
> +#include <common.h>
> +#include <linux/usb/ulpi.h>
> +
> +static int zynq_ehci_probe(struct device_d *dev)
> +{
> + struct resource *res;
> + void __iomem *base;
> +
> + res = dev_get_resource(dev, IORESOURCE_MEM, 0);
> + if (!res)
> + return -EINVAL;
dev_get_resource() returns an ERR_PTR. Test the result with
if (IS_ERR(ret))
return PTR_ERR(res);
Sascha
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