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Message-ID: <aPehfKuDCnW5sEcn@lizhi-Precision-Tower-5810>
Date: Tue, 21 Oct 2025 11:06:36 -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 7/8] reset: imx8mp-audiomix: Support i.MX8ULP SIM LPAV
On Tue, Oct 21, 2025 at 06:16:41AM -0700, Laurentiu Mihalcea wrote:
>
> On 10/20/2025 7:50 AM, Frank Li wrote:
> > On Mon, Oct 20, 2025 at 07:29:28AM -0700, Laurentiu Mihalcea wrote:
> >> On 10/17/2025 7:57 AM, Frank Li wrote:
> >>> On Fri, Oct 17, 2025 at 04:20:24AM -0700, Laurentiu Mihalcea wrote:
> >>>> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> >>>>
> >>>> Support i.MX8ULP's SIM LPAV by adding its reset map definition.
> >>>>
> >>>> Reviewed-by: Daniel Baluta <daniel.baluta@....com>
> >>>> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> >>>> ---
> >>>> drivers/reset/reset-imx8mp-audiomix.c | 51 +++++++++++++++++++++++++++
> >>>> 1 file changed, 51 insertions(+)
> >>>>
> >>>> diff --git a/drivers/reset/reset-imx8mp-audiomix.c b/drivers/reset/reset-imx8mp-audiomix.c
> >>>> index c370913107f5..b333d7c1442a 100644
> >>>> --- a/drivers/reset/reset-imx8mp-audiomix.c
> >>>> +++ b/drivers/reset/reset-imx8mp-audiomix.c
> >>>> @@ -3,6 +3,7 @@
> >>>> * Copyright 2024 NXP
> >>>> */
> >>>>
> >>>> +#include <dt-bindings/reset/fsl,imx8ulp-sim-lpav.h>
> >>>> #include <dt-bindings/reset/imx8mp-reset-audiomix.h>
> >>>>
> >>>> #include <linux/auxiliary_bus.h>
> >>>> @@ -17,6 +18,8 @@
> >>>> #define IMX8MP_AUDIOMIX_EARC_RESET_OFFSET 0x200
> >>>> #define IMX8MP_AUDIOMIX_DSP_RUNSTALL_OFFSET 0x108
> >>>>
> >>>> +#define IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET 0x8
> >>>> +
> >>>> struct imx8mp_reset_map {
> >>>> unsigned int offset;
> >>>> unsigned int mask;
> >>>> @@ -55,6 +58,50 @@ static const struct imx8mp_reset_info imx8mp_reset_info = {
> >>>> .num_lines = ARRAY_SIZE(imx8mp_reset_map),
> >>>> };
> >>>>
> >>>> +static const struct imx8mp_reset_map imx8ulp_reset_map[] = {
> >>>> + [IMX8ULP_SIM_LPAV_HIFI4_DSP_DBG_RST] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(25),
> >>> Register defination still perfer use macro. If not, let me know.
> >> I see no value in adding defines for the masks (see patch 4 commit message)
> >>
> >> in this particular scenario.
> >>
> >>
> >> Is the assignment of the "mask" field for the "struct imx8mp_reset_map" item found
> >>
> >> at index IMX8ULP_SIM_LPAV_HIFI4_DSP_DBG_RST not enough to deduce that the
> >>
> >> constant we're using is the mask for the DSP_DBG_RST bit?
> > This bit is NOT software choose bit, which must be align hardware spec.
> > Define macro help map name to spec and easy to look for spec by use macro.
>
>
> yeah, we already have the DT binding macros for that which perfectly match the name
>
> of the corresponding bit in the SYSCTRL0 register. I don't see how adding 6 more macros
>
> with the SAME name as the DT binding macros and the "_MASK" suffix would help you in
>
> this regard?
Okay, make sense.
Frank
>
>
> >
> > There are over thousand result to seach bit 25.
> >
> > eventhough search SYSCTRL0, may have many SYSCTRL0 in RM.
> >
> > Frank
> >>
> >>> Frank
> >>>> + .shift = 25,
> >>>> + .active_low = false,
> >>>> + },
> >>>> + [IMX8ULP_SIM_LPAV_HIFI4_DSP_RST] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(16),
> >>>> + .shift = 16,
> >>>> + .active_low = false,
> >>>> + },
> >>>> + [IMX8ULP_SIM_LPAV_HIFI4_DSP_STALL] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(13),
> >>>> + .shift = 13,
> >>>> + .active_low = false,
> >>>> + },
> >>>> + [IMX8ULP_SIM_LPAV_DSI_RST_BYTE_N] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(5),
> >>>> + .shift = 5,
> >>>> + .active_low = true,
> >>>> + },
> >>>> + [IMX8ULP_SIM_LPAV_DSI_RST_ESC_N] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(4),
> >>>> + .shift = 4,
> >>>> + .active_low = true,
> >>>> + },
> >>>> + [IMX8ULP_SIM_LPAV_DSI_RST_DPI_N] = {
> >>>> + .offset = IMX8ULP_SIM_LPAV_SYSCTRL0_OFFSET,
> >>>> + .mask = BIT(3),
> >>>> + .shift = 3,
> >>>> + .active_low = true,
> >>>> + },
> >>>> +};
> >>>> +
> >>>> +static const struct imx8mp_reset_info imx8ulp_reset_info = {
> >>>> + .map = imx8ulp_reset_map,
> >>>> + .num_lines = ARRAY_SIZE(imx8ulp_reset_map),
> >>>> +};
> >>>> +
> >>>> struct imx8mp_audiomix_reset {
> >>>> struct reset_controller_dev rcdev;
> >>>> void __iomem *base;
> >>>> @@ -183,6 +230,10 @@ static const struct auxiliary_device_id imx8mp_audiomix_reset_ids[] = {
> >>>> .name = "clk_imx8mp_audiomix.reset",
> >>>> .driver_data = (kernel_ulong_t)&imx8mp_reset_info,
> >>>> },
> >>>> + {
> >>>> + .name = "clk_imx8ulp_sim_lpav.reset",
> >>>> + .driver_data = (kernel_ulong_t)&imx8ulp_reset_info,
> >>>> + },
> >>>> { }
> >>>> };
> >>>> MODULE_DEVICE_TABLE(auxiliary, imx8mp_audiomix_reset_ids);
> >>>> --
> >>>> 2.43.0
> >>>>
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