linux-kernel - Re: [PATCH v6 1/2] firmware: qcom: scm: Register gunyah watchdog device

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Message-ID: <e5awatsfe6qksjj3z2vqn4fpc6pnlzuezu544f4oiyduappihp@zxgvyvyro76a>
Date: Wed, 12 Nov 2025 22:02:26 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Hrishabh Rajput <hrishabh.rajput@....qualcomm.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pavan Kondeti <pavan.kondeti@....qualcomm.com>,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v6 1/2] firmware: qcom: scm: Register gunyah watchdog
 device

On Wed, Nov 12, 2025 at 07:35:20PM +0000, Hrishabh Rajput wrote:
> To restrict Gunyah watchdog initialization to Qualcomm platforms running
> under the Gunyah Hypervisor, register the watchdog device in the QCOM
> SCM driver.
> 
> When Gunyah is not present or Gunyah emulates MMIO-based watchdog, we
> expect Qualcomm watchdog or ARM SBSA watchdog device to be present in
> the devicetree. First, we make sure we're running under the Gunyah
> Hypervisor. Then we move to check if any of the above mentioned
> watchdog device nodes are present, if not then we proceed to register
> the SMC-based Gunyah watchdog device.
> 
> Signed-off-by: Hrishabh Rajput <hrishabh.rajput@....qualcomm.com>
> ---
>  drivers/firmware/qcom/qcom_scm.c | 53 ++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 53 insertions(+)
> 
> diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
> index e777b7cb9b12..3f45cc69ef83 100644
> --- a/drivers/firmware/qcom/qcom_scm.c
> +++ b/drivers/firmware/qcom/qcom_scm.c
> @@ -2182,6 +2182,56 @@ int qcom_scm_qtee_callback_response(phys_addr_t buf, size_t buf_size,
>  }
>  EXPORT_SYMBOL(qcom_scm_qtee_callback_response);
>  
> +static void qcom_scm_gunyah_wdt_free(void *data)
> +{
> +	struct platform_device *gunyah_wdt_dev = data;
> +
> +	platform_device_unregister(gunyah_wdt_dev);
> +}
> +
> +static void qcom_scm_gunyah_wdt_init(struct qcom_scm *scm)
> +{
> +	struct platform_device *gunyah_wdt_dev;
> +	struct device_node *np;
> +	bool of_wdt_available;
> +	int i;
> +	const uuid_t gunyah_uuid = UUID_INIT(0xc1d58fcd, 0xa453, 0x5fdb,

static const

> +					     0x92, 0x65, 0xce, 0x36,
> +					     0x67, 0x3d, 0x5f, 0x14);
> +	const char * const of_wdt_compatible[] = {

static const

> +		"qcom,kpss-wdt",
> +		"arm,sbsa-gwdt",
> +	};
> +

-- 
With best wishes
Dmitry