linux-kernel - Re: [PATCH] reset: add socfpga_reset

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Date:	Mon, 03 Nov 2014 09:41:40 +0100
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	dinguyen@...nsource.altera.com
Cc:	dinh.linux@...il.com, s.trumtrar@...gutronix.de,
	atull@...nsource.altera.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] reset: add socfpga_reset_status

Hi Dinh,

Am Freitag, den 24.10.2014, 10:53 -0500 schrieb
dinguyen@...nsource.altera.com:
> From: Dinh Nguyen <dinguyen@...nsource.altera.com>
> 
> Populate the reset_status callback for SOCFPGA.
> 
> Signed-off-by: Alan Tull <atull@...nsource.altera.com>
> Signed-off-by: Dinh Nguyen <dinguyen@...nsource.altera.com>
> ---
>  drivers/reset/reset-socfpga.c | 18 ++++++++++++++++++
>  1 file changed, 18 insertions(+)
> 
> diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c
> index 79c32ca..cd37849 100644
> --- a/drivers/reset/reset-socfpga.c
> +++ b/drivers/reset/reset-socfpga.c
> @@ -76,9 +76,27 @@ static int socfpga_reset_deassert(struct reset_controller_dev *rcdev,
>  	return 0;
>  }
>  
> +static int socfpga_reset_status(struct reset_controller_dev *rcdev,
> +				unsigned long id)
> +{
> +	struct socfpga_reset_data *data = container_of(rcdev,
> +						struct socfpga_reset_data, rcdev);
> +	int bank = id / BITS_PER_LONG;
> +	int offset = id % BITS_PER_LONG;
> +	unsigned long flags;
> +	u32 reg;
> +
> +	spin_lock_irqsave(&data->lock, flags);
> +	reg = readl(data->membase + OFFSET_MODRST + (bank * NR_BANKS));
> +	spin_unlock_irqrestore(&data->lock, flags);

For the register read access, you don't need the lock.

> +	return !(reg & BIT(offset));
> +}
> +
>  static struct reset_control_ops socfpga_reset_ops = {
>  	.assert		= socfpga_reset_assert,
>  	.deassert	= socfpga_reset_deassert,
> +	.status		= socfpga_reset_status,
>  };
>  
>  static int socfpga_reset_probe(struct platform_device *pdev)

regards
Philipp

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