linux-kernel - Re: [PATCH 3/5] reset: imx8mp-audiomix: Introduce active

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Message-ID: <Z7SuZfU8utauNxg1@lizhi-Precision-Tower-5810>
Date: Tue, 18 Feb 2025 10:59:33 -0500
From: Frank Li <Frank.li@....com>
To: Daniel Baluta <daniel.baluta@....com>
Cc: p.zabel@...gutronix.de, shawnguo@...nel.org, mathieu.poirier@...aro.org,
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, andersson@...nel.org,
	linux-remoteproc@...r.kernel.org, iuliana.prodan@....com,
	laurentiu.mihalcea@....com, shengjiu.wang@....com, krzk@...nel.org
Subject: Re: [PATCH 3/5] reset: imx8mp-audiomix: Introduce active_low
 configuration option

On Tue, Feb 18, 2025 at 10:57:10AM +0200, Daniel Baluta wrote:
> For EARC and EARC PHY the reset happens when clearing the reset bits.
> Refactor assert/deassert function in order to take into account
> the active_low configuratin option.
>
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>

Reviewed-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/reset/reset-imx8mp-audiomix.c | 45 ++++++++++++++-------------
>  1 file changed, 23 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
> index 6b1666c4e069..8cc0a6b58cbc 100644
> --- a/drivers/reset/reset-imx8mp-audiomix.c
> +++ b/drivers/reset/reset-imx8mp-audiomix.c
> @@ -23,16 +23,19 @@
>  struct imx8mp_reset_map {
>  	unsigned int offset;
>  	unsigned int mask;
> +	bool active_low;
>  };
>
>  static const struct imx8mp_reset_map reset_map[IMX8MP_AUDIOMIX_RESET_NUM] = {
>  	[IMX8MP_AUDIOMIX_EARC] = {
>  		.offset	= IMX8MP_AUDIOMIX_EARC_OFFSET,
>  		.mask	= IMX8MP_AUDIOMIX_EARC_RESET_MASK,
> +		.active_low = true,
>  	},
>  	[IMX8MP_AUDIOMIX_EARC_PHY] = {
>  		.offset	= IMX8MP_AUDIOMIX_EARC_OFFSET,
>  		.mask	= IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK,
> +		.active_low = true,
>  	},
>
>  };
> @@ -48,48 +51,46 @@ static struct imx8mp_audiomix_reset *to_imx8mp_audiomix_reset(struct reset_contr
>  	return container_of(rcdev, struct imx8mp_audiomix_reset, rcdev);
>  }
>
> -static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
> -					unsigned long id)
> +static int imx8mp_audiomix_update(struct reset_controller_dev *rcdev,
> +				  unsigned long id, bool assert)
>  {
>  	struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
>  	void __iomem *reg_addr = priv->base;
> -	unsigned int mask, offset, reg;
> -	unsigned long flags;
> +	unsigned int mask, offset, active_low;
> +	unsigned long reg, flags;
>
>  	if (id >=  IMX8MP_AUDIOMIX_RESET_NUM)
>  		return -EINVAL;
>
>  	mask = reset_map[id].mask;
>  	offset = reset_map[id].offset;
> +	active_low = reset_map[id].active_low;
>
>  	spin_lock_irqsave(&priv->lock, flags);
> +
>  	reg = readl(reg_addr + offset);
> -	writel(reg & ~mask, reg_addr + offset);
> +	if (active_low ^ assert)
> +		reg |= mask;
> +	else
> +		reg &= ~mask;
> +	writel(reg, reg_addr + offset);
> +
>  	spin_unlock_irqrestore(&priv->lock, flags);
>
>  	return 0;
>  }
>
> +
> +static int imx8mp_audiomix_reset_assert(struct reset_controller_dev *rcdev,
> +					unsigned long id)
> +{
> +	return imx8mp_audiomix_update(rcdev, id, true);
> +}
> +
>  static int imx8mp_audiomix_reset_deassert(struct reset_controller_dev *rcdev,
>  					  unsigned long id)
>  {
> -	struct imx8mp_audiomix_reset *priv = to_imx8mp_audiomix_reset(rcdev);
> -	void __iomem *reg_addr = priv->base;
> -	unsigned int mask, offset, reg;
> -	unsigned long flags;
> -
> -	if (id >=  IMX8MP_AUDIOMIX_RESET_NUM)
> -		return -EINVAL;
> -
> -	mask = reset_map[id].mask;
> -	offset = reset_map[id].offset;
> -
> -	spin_lock_irqsave(&priv->lock, flags);
> -	reg = readl(reg_addr + offset);
> -	writel(reg | mask, reg_addr + offset);
> -	spin_unlock_irqrestore(&priv->lock, flags);
> -
> -	return 0;
> +	return imx8mp_audiomix_update(rcdev, id, false);
>  }
>
>  static const struct reset_control_ops imx8mp_audiomix_reset_ops = {
> --
> 2.25.1
>