linux-kernel - Re: [PATCH v4 4/8] reset: imx8mp-audiomix: Drop unneeded macros

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Message-ID: <5535d4dbf94b01fe775b5f905afea8c860f9c03a.camel@pengutronix.de>
Date: Wed, 05 Nov 2025 16:10:38 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>, Abel Vesa	
 <abelvesa@...nel.org>, Michael Turquette <mturquette@...libre.com>, Stephen
 Boyd <sboyd@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley	 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Fabio
 Estevam	 <festevam@...il.com>, Daniel Baluta <daniel.baluta@....com>,
 Shengjiu Wang	 <shengjiu.wang@....com>, Frank Li <Frank.Li@....com>
Cc: 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 v4 4/8] reset: imx8mp-audiomix: Drop unneeded macros

On Di, 2025-11-04 at 04:02 -0800, Laurentiu Mihalcea wrote:
> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> 
> The macros defining the mask values for the EARC, EARC PHY resets,
> and the DSP RUN_STALL signal can be dropped as they are not and will
> not be used anywhere else except to set the value of the "mask" field
> from "struct imx8mp_reset_map". In this particular case, based on the
> name of the "mask" field, you can already deduce what these values are
> for, which is why defining macros for them doesn't offer any new
> information, nor does it help with the code readability.
> 
> Reviewed-by: Daniel Baluta <daniel.baluta@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>
> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> ---
>  drivers/reset/reset-imx8mp-audiomix.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
> index eceb37ff5dc5..e9643365a62c 100644
> --- a/drivers/reset/reset-imx8mp-audiomix.c
> +++ b/drivers/reset/reset-imx8mp-audiomix.c
> @@ -14,11 +14,7 @@
>  #include <linux/reset-controller.h>
>  
>  #define IMX8MP_AUDIOMIX_EARC_RESET_OFFSET	0x200
> -#define IMX8MP_AUDIOMIX_EARC_RESET_MASK		BIT(0)
> -#define IMX8MP_AUDIOMIX_EARC_PHY_RESET_MASK	BIT(1)
> -
>  #define IMX8MP_AUDIOMIX_DSP_RUNSTALL_OFFSET	0x108
> -#define IMX8MP_AUDIOMIX_DSP_RUNSTALL_MASK	BIT(5)
>  
>  struct imx8mp_reset_map {
>  	unsigned int offset;
> @@ -29,17 +25,17 @@ struct imx8mp_reset_map {
>  static const struct imx8mp_reset_map reset_map[] = {
>  	[IMX8MP_AUDIOMIX_EARC_RESET] = {
>  		.offset	= IMX8MP_AUDIOMIX_EARC_RESET_OFFSET,
> -		.mask	= IMX8MP_AUDIOMIX_EARC_RESET_MASK,
> +		.mask = BIT(0),

Since the masks are all single-bit, and you make that mandatory in the
next patch, I suggest storing the bit offset in the reset map instead:

-		.mask	= IMX8MP_AUDIOMIX_EARC_RESET_MASK,
+		.bit = 0,

and so on. That way it's clear that no reset control ever manipulates
multiple bits at the same time.

Either way, either in this patch or the next, add an

  #include <linux/bits.h>

for BIT().

regards
Philipp