linux-kernel - Re: [PATCH v2 4/4] spi: spi-coldfire-qspi: enable RuntimePM before registering to the core

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Message-ID: <20151009182729.GA1544@katana>
Date:	Fri, 9 Oct 2015 19:27:29 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	linux-sh@...r.kernel.org
Cc:	Mark Brown <broonie@...nel.org>, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] spi: spi-coldfire-qspi: enable RuntimePM before
 registering to the core

On Fri, Oct 09, 2015 at 10:39:27AM +0100, Wolfram Sang wrote:
> From: Wolfram Sang <wsa+renesas@...g-engineering.com>
> 
> The core may register clients attached to this master which may use
> funtionality from the master. So, RuntimePM must be enabled before, otherwise
> this will fail.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

V2 adds disabling runtime_pm in the error path. There are no
dependencies. Patches 1-3 do the same for I2C drivers. I generated this
series from a branch and sent out as is; probably I should have sent the
SPI one individually.

Thanks,

   Wolfram

> ---
>  drivers/spi/spi-coldfire-qspi.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/spi/spi-coldfire-qspi.c b/drivers/spi/spi-coldfire-qspi.c
> index 688956ff5095c2..23f6fffd75e111 100644
> --- a/drivers/spi/spi-coldfire-qspi.c
> +++ b/drivers/spi/spi-coldfire-qspi.c
> @@ -420,19 +420,20 @@ static int mcfqspi_probe(struct platform_device *pdev)
>  	master->auto_runtime_pm = true;
>  
>  	platform_set_drvdata(pdev, master);
> +	pm_runtime_enable(&pdev->dev);
>  
>  	status = devm_spi_register_master(&pdev->dev, master);
>  	if (status) {
>  		dev_dbg(&pdev->dev, "spi_register_master failed\n");
>  		goto fail2;
>  	}
> -	pm_runtime_enable(&pdev->dev);
>  
>  	dev_info(&pdev->dev, "Coldfire QSPI bus driver\n");
>  
>  	return 0;
>  
>  fail2:
> +	pm_runtime_disable(&pdev->dev);
>  	mcfqspi_cs_teardown(mcfqspi);
>  fail1:
>  	clk_disable(mcfqspi->clk);
> -- 
> 2.1.4
> 

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