linux-kernel - Re: [PATCH v4 3/7] usb: dwc3: core: Don't touch resets and clocks

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Message-ID: <w72zvfh3uf7crbkmuenxcjnu6moircjdy6rnbzszl4tjlm2jks@4z2k3iqt2ohi>
Date: Thu, 27 Feb 2025 06:24:17 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Felipe Balbi <balbi@...nel.org>, 
	Wesley Cheng <quic_wcheng@...cinc.com>, Saravana Kannan <saravanak@...gle.com>, 
	Thinh Nguyen <Thinh.Nguyen@...opsys.com>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	Frank Li <Frank.li@....com>, linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] usb: dwc3: core: Don't touch resets and clocks

On Wed, Feb 26, 2025 at 04:17:50PM -0800, Bjorn Andersson wrote:
> When the core is integrated with glue, it's reasonable to assume that
> the glue driver will have to touch the IP before/after the core takes
> the hardware out and into reset. As such the glue must own these
> resources and be allowed to turn them on/off outside the core's
> handling.
> 
> Allow the platform or glue layer to indicate if the core logic for
> clocks and resets should be skipped to deal with this.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@....qualcomm.com>
> ---
>  drivers/usb/dwc3/core.c | 19 +++++++++++--------
>  drivers/usb/dwc3/glue.h |  1 +
>  2 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
> index d9f0a6782d36..aecdde8dc999 100644
> --- a/drivers/usb/dwc3/core.c
> +++ b/drivers/usb/dwc3/core.c
> @@ -2328,6 +2330,7 @@ static int dwc3_probe(struct platform_device *pdev)
>  
>  	probe_data.dwc = dwc;
>  	probe_data.res = res;
> +	probe_data.ignore_clocks_and_resets = false;

Isn't it a default value?

>  
>  	return dwc3_core_probe(&probe_data);
>  }
> diff --git a/drivers/usb/dwc3/glue.h b/drivers/usb/dwc3/glue.h
> index e73cfc466012..1ddb451bdbd0 100644
> --- a/drivers/usb/dwc3/glue.h
> +++ b/drivers/usb/dwc3/glue.h
> @@ -17,6 +17,7 @@
>  struct dwc3_probe_data {
>  	struct dwc3 *dwc;
>  	struct resource *res;
> +	bool ignore_clocks_and_resets;
>  };
>  
>  int dwc3_core_probe(const struct dwc3_probe_data *data);
> 
> -- 
> 2.45.2
> 

-- 
With best wishes
Dmitry