linux-kernel - RE: [PATCH 2/2] spi: tegra210-quad: add acpi support

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Message-ID: <BN6PR12MB124973BF5CBB4AB35CC59B8AC3669@BN6PR12MB1249.namprd12.prod.outlook.com>
Date:   Mon, 29 Nov 2021 09:09:30 +0000
From:   Krishna Yarlagadda <kyarlagadda@...dia.com>
To:     Mark Brown <broonie@...nel.org>
CC:     Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Sowjanya Komatineni <skomatineni@...dia.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 2/2] spi: tegra210-quad: add acpi support

> -----Original Message-----
> From: Mark Brown <broonie@...nel.org>
> Sent: 25 November 2021 18:29
> To: Krishna Yarlagadda <kyarlagadda@...dia.com>
> Cc: Laxman Dewangan <ldewangan@...dia.com>; Thierry Reding
> <thierry.reding@...il.com>; Jonathan Hunter <jonathanh@...dia.com>;
> Sowjanya Komatineni <skomatineni@...dia.com>; Philipp Zabel
> <p.zabel@...gutronix.de>; linux-tegra@...r.kernel.org; linux-
> spi@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH 2/2] spi: tegra210-quad: add acpi support
> 
> On Thu, Nov 25, 2021 at 03:25:52PM +0530, Krishna Yarlagadda wrote:
> 
> > +#ifdef CONFIG_ACPI
> > +	if (ACPI_FAILURE(acpi_evaluate_object(ACPI_HANDLE(tqspi->dev),
> > +					      "_RST", NULL, NULL)))
> > +		dev_err(tqspi->dev, "failed to reset device\n"); #endif
> 
> What happens when this runs on a DT system?
For a DT system reset handle would be present and this code will not run
-KY