linux-kernel - Re: [PATCH v3 5/5] mtd: spi-nor: cadence-quadspi: Add runtime PM support

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Date:   Sun, 24 Sep 2017 14:01:03 +0200
From:   Marek Vasut <marek.vasut@...il.com>
To:     Vignesh R <vigneshr@...com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Rob Herring <robh+dt@...nel.org>,
        linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 5/5] mtd: spi-nor: cadence-quadspi: Add runtime PM
 support

On 09/24/2017 12:59 PM, Vignesh R wrote:
> Add pm_runtime* calls to cadence-quadspi driver. This is required to
> switch on QSPI power domain on TI 66AK2G SoC during probe.
> 
> Signed-off-by: Vignesh R <vigneshr@...com>

Are you planning to add some more fine-grained PM control later?

> ---
>  drivers/mtd/spi-nor/cadence-quadspi.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/mtd/spi-nor/cadence-quadspi.c b/drivers/mtd/spi-nor/cadence-quadspi.c
> index d9629e8f4798..2c8e6226d267 100644
> --- a/drivers/mtd/spi-nor/cadence-quadspi.c
> +++ b/drivers/mtd/spi-nor/cadence-quadspi.c
> @@ -31,6 +31,7 @@
>  #include <linux/of_device.h>
>  #include <linux/of.h>
>  #include <linux/platform_device.h>
> +#include <linux/pm_runtime.h>
>  #include <linux/sched.h>
>  #include <linux/spi/spi.h>
>  #include <linux/timer.h>
> @@ -1224,6 +1225,13 @@ static int cqspi_probe(struct platform_device *pdev)
>  		return -ENXIO;
>  	}
>  
> +	pm_runtime_enable(&pdev->dev);
> +	ret = pm_runtime_get_sync(&pdev->dev);
> +	if (ret < 0) {
> +		pm_runtime_put_noidle(&pdev->dev);
> +		return ret;
> +	}
> +
>  	ret = clk_prepare_enable(cqspi->clk);
>  	if (ret) {
>  		dev_err(dev, "Cannot enable QSPI clock.\n");
> @@ -1275,6 +1283,9 @@ static int cqspi_remove(struct platform_device *pdev)
>  
>  	clk_disable_unprepare(cqspi->clk);
>  
> +	pm_runtime_put_sync(&pdev->dev);
> +	pm_runtime_disable(&pdev->dev);
> +
>  	return 0;
>  }
>  
> 


-- 
Best regards,
Marek Vasut