linux-kernel - Re: [PATCH V2 6/7] coresight: stm: Move ACPI support from AMBA driver to platform driver

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Date:   Mon, 4 Dec 2023 10:23:49 +0000
From:   James Clark <james.clark@....com>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org, suzuki.poulose@....com
Cc:     Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        coresight@...ts.linaro.org,
        linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH V2 6/7] coresight: stm: Move ACPI support from AMBA driver
 to platform driver



On 01/12/2023 06:20, Anshuman Khandual wrote:
> Add support for the stm devices in the platform driver, which can then be
> used on ACPI based platforms. This change would now allow runtime power
> management for ACPI based systems. The driver would try to enable the APB
> clock if available.
> 
> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
> Cc: Sudeep Holla <sudeep.holla@....com>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Mike Leach <mike.leach@...aro.org>
> Cc: James Clark <james.clark@....com>
> Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>
> Cc: Alexandre Torgue <alexandre.torgue@...s.st.com>
> Cc: linux-acpi@...r.kernel.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> Cc: coresight@...ts.linaro.org
> Cc: linux-stm32@...md-mailman.stormreply.com
> Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
> ---
[...]
>  
> -module_amba_driver(stm_driver);
> +static int stm_platform_probe(struct platform_device *pdev)
> +{
> +	struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	int ret = 0;
> +
> +	pm_runtime_get_noresume(&pdev->dev);
> +	pm_runtime_set_active(&pdev->dev);
> +	pm_runtime_enable(&pdev->dev);
> +
> +	ret = __stm_probe(&pdev->dev, res, NULL);

Very minor nit, but this used to print this:

  coresight stm0: STM500 initialized

And now it prints this:

  coresight stm0: (null) initialized

(null) kind of makes it look a little bit like something has gone wrong.
Maybe we could just put "initialised" if you don't have a string from ACPI?