Re: [PATCH 05/10] usb: chipidea: msm: support the HSIC asynchronous wakeup interrupt

From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>,
	Bartosz Golaszewski <brgl@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Linus Walleij <linusw@kernel.org>, Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Xu Yang <xu.yang_2@nxp.com>, Peng Fan <peng.fan@nxp.com>,
	Vinod Koul <vkoul@kernel.org>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Peter Chen <peter.chen@kernel.org>,
	Pavankumar Kondeti <quic_pkondeti@quicinc.com>,
	Stephen Boyd <stephen.boyd@linaro.org>,
	Konrad Dybcio <konradybcio@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>,
	linux-arm-msm@vger.kernel.org, linux-gpio@vger.kernel.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-usb@vger.kernel.org, linux-phy@lists.infradead.org,
	Greg Kroah-Hartman <gregkh@suse.de>,
	Peter Chen <peter.chen@nxp.com>
Subject: Re: [PATCH 05/10] usb: chipidea: msm: support the HSIC asynchronous wakeup interrupt
Date: Tue, 18 Aug 2026 12:36:30 +0200	[thread overview]
Message-ID: <1e070cab-ad61-4ac4-be94-1ea40f5b6575@oss.qualcomm.com> (raw)
In-Reply-To: <20260810-msm8974-usb-hsic-v1-5-e5f93ea76ffa@oss.qualcomm.com>

On 8/10/26 5:42 PM, Dmitry Baryshkov wrote:
> The HSIC instances of the chipidea controller runtime-suspend with
> their clocks gated whenever the bus is empty. HSIC has no VBUS-style
> connect detection: a device (such as an onboard hub coming out of
> reset) signals a single connect event, and if the controller is
> suspended at that moment the connect is never noticed and the device
> never enumerates.

[...]

> +	/*
> +	 * The optional second interrupt is the asynchronous wakeup interrupt
> +	 * of the HSIC instances: without it a bus connect arriving while the
> +	 * runtime-suspended controller has its clocks gated is never seen.
> +	 */
> +	wake_irq = platform_get_irq_optional(pdev, 1);
> +	if (wake_irq > 0) {
> +		device_init_wakeup(&plat_ci->dev, true);
> +		ret = dev_pm_set_dedicated_wake_irq(&plat_ci->dev, wake_irq);

devm_pm_set_wake_irq()?

Konrad