linux-kernel - Re: [PATCH 2/2] reset: bcm63xx: Add support for the BCM63xx soft-reset controller

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Date:	Wed, 2 Dec 2015 20:43:49 +0000
From:	Simon Arlott <simon@...e.lp0.eu>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	Kevin Cernekee <cernekee@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	MIPS Mailing List <linux-mips@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>
Subject: Re: [PATCH 2/2] reset: bcm63xx: Add support for the BCM63xx
 soft-reset controller

On 02/12/15 18:03, Florian Fainelli wrote:
> 2015-11-30 12:58 GMT-08:00 Simon Arlott <simon@...e.lp0.eu>:
>> The BCM63xx contains a soft-reset controller activated by setting
>> a bit (that must previously have cleared).
>>
>> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
>> ---
>>  MAINTAINERS                   |   1 +
>>  drivers/reset/Kconfig         |   9 +++
>>  drivers/reset/Makefile        |   1 +
>>  drivers/reset/reset-bcm63xx.c | 134 ++++++++++++++++++++++++++++++++++++++++++
>>  4 files changed, 145 insertions(+)
>>  create mode 100644 drivers/reset/reset-bcm63xx.c
> 
> 
> Could you create a bcm directory and then add your reset-bcm63xx.c
> file there? I have a pending submission for the BCM63138 reset
> controller which is not at all using the same structure and will share
> nothing with your driver.
> 

Ok, I'll call it reset-bcm6345.c to avoid confusion.

> 
>> +static int bcm63xx_reset_xlate(struct reset_controller_dev *rcdev,
>> +       const struct of_phandle_args *reset_spec)
>> +{
>> +       struct bcm63xx_reset_priv *priv = to_bcm63xx_reset_priv(rcdev);
>> +
>> +       if (WARN_ON(reset_spec->args_count != rcdev->of_reset_n_cells))
>> +               return -EINVAL;
>> +
>> +       if (reset_spec->args[0] >= rcdev->nr_resets)
>> +               return -EINVAL;
> 
> Should not these two things be moved to the core reset controller code
> based on the #reset-cells value?
> 

This has already been removed from the next version of the patch.

> 
>> +       if (of_property_read_u32(np, "offset", &priv->offset))
>> +               return -EINVAL;
>> +
>> +       /* valid reset bits */
>> +       if (of_property_read_u32(np, "mask", &priv->mask))
>> +               priv->mask = 0xffffffff;
>> +
>> +       priv->rcdev.owner = THIS_MODULE;
>> +       priv->rcdev.ops = &bcm63xx_reset_ops;
>> +       priv->rcdev.nr_resets = 32;
> 
> Should not that come from Device Tree, or be computed based on the
> mask property, like hweight_long() or something along these lines?

The "mask" property has been removed. It will assume 32 resets and rely
on the rest of the DT to only refer to valid bits.

-- 
Simon Arlott
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