linux-kernel - Re: [PATCH v2 6/8] reset: imx8mp-audiomix: Extend the driver usage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <aPJZCv+iG6cuxsj4@lizhi-Precision-Tower-5810>
Date: Fri, 17 Oct 2025 10:56:10 -0400
From: Frank Li <Frank.li@....com>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>
Cc: Abel Vesa <abelvesa@...nel.org>, Peng Fan <peng.fan@....com>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Fabio Estevam <festevam@...il.com>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Daniel Baluta <daniel.baluta@....com>,
	Shengjiu Wang <shengjiu.wang@....com>, linux-clk@...r.kernel.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Pengutronix Kernel Team <kernel@...gutronix.de>
Subject: Re: [PATCH v2 6/8] reset: imx8mp-audiomix: Extend the driver usage

On Fri, Oct 17, 2025 at 04:20:23AM -0700, Laurentiu Mihalcea wrote:
> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
>
> Some NXP SoCs integrate one or more, per-subsystem, block control IPs,
> which allow users to control the assertion and de-assertion of the
> reset lines tied to some peripherals present in said subsystems. Some
> examples of such SoCs include i.MX8MP with AUDIOMIX block control and
> i.MX8ULP with SIM LPAV.
>
> Some of the aformentioned block control IPs exhibit a common pattern with
> respect to the assertion and de-assertion of the reset lines. Namely, the
> user is able to control the state of the reset line by toggling a bit from
> one of the IP's registers.
>
> Linux can take advantage of this pattern and, instead of having one driver
> for each block control IP, a single, more generic driver could be used.
>
> To allow this to happen, the previous approach, in which a single reset
> map is used, is replaced by a per-driver approach, in which each auxiliary
> device driver holds a reference to a certain reset map.

Can you shorter your commit message?, basically, you just add
imx8mp_reset_info for difference auxiliary_device_id.

>
> Reviewed-by: Daniel Baluta <daniel.baluta@....com>
> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> ---
>  drivers/reset/reset-imx8mp-audiomix.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
> index c74ce6e04177..c370913107f5 100644
> --- a/drivers/reset/reset-imx8mp-audiomix.c
> +++ b/drivers/reset/reset-imx8mp-audiomix.c
> @@ -24,7 +24,12 @@ struct imx8mp_reset_map {
>  	bool active_low;
>  };
>
> -static const struct imx8mp_reset_map reset_map[] = {
> +struct imx8mp_reset_info {
> +	const struct imx8mp_reset_map *map;
> +	int num_lines;
> +};
> +
> +static const struct imx8mp_reset_map imx8mp_reset_map[] = {
>  	[IMX8MP_AUDIOMIX_EARC_RESET] = {
>  		.offset	= IMX8MP_AUDIOMIX_EARC_RESET_OFFSET,
>  		.mask = BIT(0),
> @@ -45,10 +50,16 @@ static const struct imx8mp_reset_map reset_map[] = {
>  	},
>  };
>
> +static const struct imx8mp_reset_info imx8mp_reset_info = {
> +	.map = imx8mp_reset_map,
> +	.num_lines = ARRAY_SIZE(imx8mp_reset_map),
> +};
> +
>  struct imx8mp_audiomix_reset {
>  	struct reset_controller_dev rcdev;
>  	void __iomem *base;
>  	struct regmap *regmap;
> +	const struct imx8mp_reset_info *rinfo;
>  };
>
>  static struct imx8mp_audiomix_reset *to_imx8mp_audiomix_reset(struct reset_controller_dev *rcdev)
> @@ -60,6 +71,7 @@ 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);
> +	const struct imx8mp_reset_map *reset_map = priv->rinfo->map;
>  	unsigned int mask, offset, active_low, shift, val;
>
>  	mask = reset_map[id].mask;
> @@ -144,7 +156,8 @@ static int imx8mp_audiomix_reset_probe(struct auxiliary_device *adev,
>  		return -ENOMEM;
>
>  	priv->rcdev.owner     = THIS_MODULE;
> -	priv->rcdev.nr_resets = ARRAY_SIZE(reset_map);
> +	priv->rinfo           = (const struct imx8mp_reset_info *)id->driver_data;

needn't force convert from void*

Frank

> +	priv->rcdev.nr_resets = priv->rinfo->num_lines;
>  	priv->rcdev.ops       = &imx8mp_audiomix_reset_ops;
>  	priv->rcdev.of_node   = dev->parent->of_node;
>  	priv->rcdev.dev	      = dev;
> @@ -168,6 +181,7 @@ static int imx8mp_audiomix_reset_probe(struct auxiliary_device *adev,
>  static const struct auxiliary_device_id imx8mp_audiomix_reset_ids[] = {
>  	{
>  		.name = "clk_imx8mp_audiomix.reset",
> +		.driver_data = (kernel_ulong_t)&imx8mp_reset_info,
>  	},
>  	{ }
>  };
> --
> 2.43.0
>