On Fri, May 05, 2023, Stanley Chang wrote:
> The Realtek RTD SoCs were designed with the global register address
> offset at 0x8100. The default address offset is constant at
> DWC3_GLOBALS_REGS_START (0xc100). Therefore, add a check if the
> compatible name of the parent is realtek,rtd-dwc3, then global
> register start address will remap to 0x8100.
>
> Signed-off-by: Stanley Chang <stanley_chang@xxxxxxxxxxx>
> ---
> v5 to v6 change:
> Change the compatible name to avoid using the wildcard.
>
> v4 to v5 change:
> Use the compatible name of the parent to match this special offset.
>
> v3 to v4 change:
> Use the compatible name to specify the global register address offset.
> If the compatible name is "snps,dwc3-rtk-soc", then the offset use 0x8100.
> Otherwise, the offset is default value 0xc100.
>
> v2 to v3 change:
> 1. Fix the dtschema validation error.
>
> v1 to v2 change:
> 1. Change the name of the property "snps,global-regs-starting-offset".
> 2. Adjust the format of comment.
> 3. Add initial value of the global_regs_starting_offset
> 4. Remove the log of dev_info.
> ---
> drivers/usb/dwc3/core.c | 11 +++++++++++
> drivers/usb/dwc3/core.h | 2 ++
> 2 files changed, 13 insertions(+)
>
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index 0beaab932e7d..278cd1c33841 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -1800,6 +1800,17 @@ static int dwc3_probe(struct platform_device *pdev)
> dwc_res = *res;
> dwc_res.start += DWC3_GLOBALS_REGS_START;
>
> + if (dev->of_node) {
> + struct device_node *parent = of_get_parent(dev->of_node);
> +
> + if (of_device_is_compatible(parent, "realtek,rtd-dwc3")) {
> + dwc_res.start -= DWC3_GLOBALS_REGS_START;
> + dwc_res.start += DWC3_RTK_RTD_GLOBALS_REGS_START;
> + }
> +
> + of_node_put(parent);
> + }
> +
> regs = devm_ioremap_resource(dev, &dwc_res);
> if (IS_ERR(regs))
> return PTR_ERR(regs);
> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
> index d56457c02996..1968638f29ed 100644
> --- a/drivers/usb/dwc3/core.h
> +++ b/drivers/usb/dwc3/core.h
> @@ -84,6 +84,8 @@
> #define DWC3_OTG_REGS_START 0xcc00
> #define DWC3_OTG_REGS_END 0xccff
>
> +#define DWC3_RTK_RTD_GLOBALS_REGS_START 0x8100
> +
> /* Global Registers */
> #define DWC3_GSBUSCFG0 0xc100
> #define DWC3_GSBUSCFG1 0xc104
> --
> 2.34.1
>
Acked-by: Thinh Nguyen <Thinh.Nguyen@xxxxxxxxxxxx>
Thanks,
Thinh
