linux-kernel - Re: [v2,4/6] reset-controller: ti: introduce a new reset handler

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Message-ID: <1596517831.27829.3.camel@mtkswgap22>
Date:   Tue, 4 Aug 2020 13:10:31 +0800
From:   Stanley Chu <stanley.chu@...iatek.com>
To:     Crystal Guo <crystal.guo@...iatek.com>
CC:     <p.zabel@...gutronix.de>, <robh+dt@...nel.org>,
        <matthias.bgg@...il.com>, <srv_heupstream@...iatek.com>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <seiya.wang@...iatek.com>,
        <yingjoe.chen@...iatek.com>, <fan.chen@...iatek.com>,
        <yong.liang@...iatek.com>
Subject: Re: [v2,4/6] reset-controller: ti: introduce a new reset handler

On Mon, 2020-08-03 at 14:15 +0800, Crystal Guo wrote:
> Add ti_syscon_reset() to integrate assert and deassert together.
> If some modules need do serialized assert and deassert operations
> to reset itself, reset_control_reset can be called for convenience.
> 
> Change-Id: I9046992b115a46f3594de57fa89c6a2de9957d49

Please drop "Change-Id" tags.

> ---
>  drivers/reset/reset-ti-syscon.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/reset/reset-ti-syscon.c b/drivers/reset/reset-ti-syscon.c
> index a2635c21db7f..1c74bcb9a6c3 100644
> --- a/drivers/reset/reset-ti-syscon.c
> +++ b/drivers/reset/reset-ti-syscon.c
> @@ -56,6 +56,7 @@ struct ti_syscon_reset_data {
>  	struct regmap *regmap;
>  	struct ti_syscon_reset_control *controls;
>  	unsigned int nr_controls;
> +	bool assert_deassert_together;
>  };
>  
>  #define to_ti_syscon_reset_data(rcdev)	\
> @@ -158,10 +159,24 @@ static int ti_syscon_reset_status(struct reset_controller_dev *rcdev,
>  		!(control->flags & STATUS_SET);
>  }
>  
> +static int ti_syscon_reset(struct reset_controller_dev *rcdev,
> +			  unsigned long id)
> +{
> +	struct ti_syscon_reset_data *data = to_ti_syscon_reset_data(rcdev);
> +
> +	if (data->assert_deassert_together) {
> +		ti_syscon_reset_assert(rcdev, id);
> +		return ti_syscon_reset_deassert(rcdev, id);
> +	} else {
> +		return -ENOTSUPP;
> +	}
> +}
> +
>  static const struct reset_control_ops ti_syscon_reset_ops = {
>  	.assert		= ti_syscon_reset_assert,
>  	.deassert	= ti_syscon_reset_deassert,
>  	.status		= ti_syscon_reset_status,
> +	.reset		= ti_syscon_reset,
>  };
>  
>  static int ti_syscon_reset_probe(struct platform_device *pdev)
> @@ -204,6 +219,11 @@ static int ti_syscon_reset_probe(struct platform_device *pdev)
>  		controls[i].flags = be32_to_cpup(list++);
>  	}
>  
> +	if (of_property_read_bool(np, "assert-deassert-together"))
> +		data->assert_deassert_together = true;
> +	else
> +		data->assert_deassert_together = false;
> +
>  	data->rcdev.ops = &ti_syscon_reset_ops;
>  	data->rcdev.owner = THIS_MODULE;
>  	data->rcdev.of_node = np;

Perhaps please provide the reason why you shall add this new method? Any
existed or upcoming users?

Thanks,

Stanley Chu