linux-kernel - Re: [PATCH 1/2] spi: atmel: factorize reusable code for SPI controller init

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Date:   Wed, 12 Apr 2017 10:40:23 +0200
From:   Nicolas Ferre <nicolas.ferre@...rochip.com>
To:     Quentin Schulz <quentin.schulz@...e-electrons.com>,
        <broonie@...nel.org>
CC:     <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alexandre.belloni@...e-electrons.com>,
        <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH 1/2] spi: atmel: factorize reusable code for SPI
 controller init

Le 12/04/2017 à 09:05, Quentin Schulz a écrit :
> The SPI controller configuration during the init can be reused, for the
> resume function for example.
> 
> Let's move this configuration to a separate function.
> 
> Signed-off-by: Quentin Schulz <quentin.schulz@...e-electrons.com>

Okay:
Acked-by: Nicolas Ferre <nicolas.ferre@...rochip.com>

> ---
>  drivers/spi/spi-atmel.c | 35 +++++++++++++++++++++--------------
>  1 file changed, 21 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
> index 0e7712b..247d920 100644
> --- a/drivers/spi/spi-atmel.c
> +++ b/drivers/spi/spi-atmel.c
> @@ -1464,6 +1464,25 @@ static int atmel_spi_gpio_cs(struct platform_device *pdev)
>  	return 0;
>  }
>  
> +static void atmel_spi_init(struct atmel_spi *as)
> +{
> +	spi_writel(as, CR, SPI_BIT(SWRST));
> +	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
> +	if (as->caps.has_wdrbt) {
> +		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
> +				| SPI_BIT(MSTR));
> +	} else {
> +		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
> +	}
> +
> +	if (as->use_pdc)
> +		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
> +	spi_writel(as, CR, SPI_BIT(SPIEN));
> +
> +	if (as->fifo_size)
> +		spi_writel(as, CR, SPI_BIT(FIFOEN));
> +}
> +
>  static int atmel_spi_probe(struct platform_device *pdev)
>  {
>  	struct resource		*regs;
> @@ -1572,26 +1591,14 @@ static int atmel_spi_probe(struct platform_device *pdev)
>  
>  	as->spi_clk = clk_get_rate(clk);
>  
> -	spi_writel(as, CR, SPI_BIT(SWRST));
> -	spi_writel(as, CR, SPI_BIT(SWRST)); /* AT91SAM9263 Rev B workaround */
> -	if (as->caps.has_wdrbt) {
> -		spi_writel(as, MR, SPI_BIT(WDRBT) | SPI_BIT(MODFDIS)
> -				| SPI_BIT(MSTR));
> -	} else {
> -		spi_writel(as, MR, SPI_BIT(MSTR) | SPI_BIT(MODFDIS));
> -	}
> -
> -	if (as->use_pdc)
> -		spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
> -	spi_writel(as, CR, SPI_BIT(SPIEN));
> -
>  	as->fifo_size = 0;
>  	if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
>  				  &as->fifo_size)) {
>  		dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
> -		spi_writel(as, CR, SPI_BIT(FIFOEN));
>  	}
>  
> +	atmel_spi_init(as);
> +
>  	pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
>  	pm_runtime_use_autosuspend(&pdev->dev);
>  	pm_runtime_set_active(&pdev->dev);
> 


-- 
Nicolas Ferre