回复: 回复: [PATCH v1] mailbox: add i.MX Messaging Unit (MU) driver

[Alice Guo (OSS)]

> -----邮件原件-----
> 发件人: Marek Vasut <marex at denx.de>
> 发送时间: 2025年3月4日 10:58
> 收件人: Alice Guo (OSS) <alice.guo at oss.nxp.com>; trini at konsulko.com;
> sbabic at denx.de; festevam at gmail.com; dl-uboot-imx <uboot-imx at nxp.com>;
> lukma at denx.de; seanga2 at gmail.com; sjg at chromium.org;
> alpernebiyasak at gmail.com
> 抄送: u-boot at lists.denx.de; Peng Fan <peng.fan at nxp.com>; Viorel Suman
> <viorel.suman at nxp.com>; Ye Li <ye.li at nxp.com>
> 主题: Re: 回复: [PATCH v1] mailbox: add i.MX Messaging Unit (MU) driver
> 
> On 3/4/25 3:35 AM, Alice Guo (OSS) wrote:
> 
> [...]
> 
> >>> +static const struct udevice_id ids[] = {
> >>> +	{ .compatible = "fsl,imx6sx-mu", .data =
> (ulong)&imx_mu_cfg_imx6sx },
> >>> +	{ .compatible = "fsl,imx7ulp-mu", .data =
> (ulong)&imx_mu_cfg_imx7ulp },
> >>> +	{ .compatible = "fsl,imx8ulp-mu", .data =
> (ulong)&imx_mu_cfg_imx8ulp },
> >>> +	{ .compatible = "fsl,imx95-mu", .data = (ulong)&imx_mu_cfg_imx95
> >>> +},
> >> Wouldn't it be useful to include also fsl,imx95-mu-ele and
> >> fsl,imx95-mu-v2x for
> >> iMX95 ? Esp. the ELE is something which surely is present due to the
> >> AHAB container, right ?
> >
> > The compatible " fsl,imx8ulp-mu" used by i.MX8ULP MU is incorrect. Will
> modify it in the next version.
> 
> OK
> 
> > The driver of i.MX95 ELE MU is in drivers/misc/imx_ele/ele_mu.c.
> 
> Why does Linux use MU driver for the ELE , while U-Boot has some separate
> driver ?

In drivers/firmware/scmi/mailbox_agent.c, some APIs provided by common mailbox framework are used. So, the driver of i.MX 95 MU for SCMI exchanges needs to use common mailbox framework.

In drivers/misc/imx_ele/ele_api.c, APIs provided by drivers/misc/misc-uclass.c are used. So, the driver of i.MX MU for ELE needs to use UCLASS_MISC.

> > No need to add the driver for i.MX95 MU V2X in U-Boot.
> 
> How so ?

Because we do not use i.MX95 MU V2X in U-Boot.