linux-kernel - Re: [PATCH] mailbox, remoteproc: omap2+: fix compile testing

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Message-ID: <CABb+yY12GT6GmStDpoghwP4YL+UD+PAhTKTf1vuLjfiSpm65xw@mail.gmail.com>
Date: Sun, 22 Sep 2024 19:27:29 -0500
From: Jassi Brar <jassisinghbrar@...il.com>
To: Arnd Bergmann <arnd@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Mathieu Poirier <mathieu.poirier@...aro.org>, 
	Hari Nagalla <hnagalla@...com>, Andrew Davis <afd@...com>, Martyn Welch <martyn.welch@...labora.com>, 
	Arnd Bergmann <arnd@...db.de>, Konrad Dybcio <konradybcio@...nel.org>, linux-kernel@...r.kernel.org, 
	linux-remoteproc@...r.kernel.org
Subject: Re: [PATCH] mailbox, remoteproc: omap2+: fix compile testing

On Mon, Sep 9, 2024 at 3:38 PM Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> Selecting CONFIG_OMAP2PLUS_MBOX while compile testing
> causes a build failure:
>
> WARNING: unmet direct dependencies detected for OMAP2PLUS_MBOX
>   Depends on [n]: MAILBOX [=y] && (ARCH_OMAP2PLUS || ARCH_K3)
>   Selected by [m]:
>   - TI_K3_M4_REMOTEPROC [=m] && REMOTEPROC [=y] && (ARCH_K3 || COMPILE_TEST [=y])
>
> Using 'select' to force-enable another subsystem is generally
> a mistake and causes problems such as this one, so change the
> three drivers that link against this driver to use 'depends on'
> instead, and ensure the driver itself can be compile tested
> regardless of the platform.
>
> When compile-testing without CONFIG_TI_SCI_PROTOCOL=m, there
> is a chance for a link failure, so add a careful dependency
> on that.
>
> arm-linux-gnueabi-ld: drivers/remoteproc/ti_k3_m4_remoteproc.o: in function `k3_m4_rproc_probe':
> ti_k3_m4_remoteproc.c:(.text.k3_m4_rproc_probe+0x76): undefined reference to `devm_ti_sci_get_by_phandle'
>
> Fixes: ebcf9008a895 ("remoteproc: k3-m4: Add a remoteproc driver for M4F subsystem")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/mailbox/Kconfig        |  2 +-
>  drivers/mailbox/omap-mailbox.c |  2 +-
>  drivers/remoteproc/Kconfig     | 10 ++++------
>  3 files changed, 6 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
> index 4eed97295927..ecaf78beb934 100644
> --- a/drivers/mailbox/Kconfig
> +++ b/drivers/mailbox/Kconfig
> @@ -73,7 +73,7 @@ config ARMADA_37XX_RWTM_MBOX
>
>  config OMAP2PLUS_MBOX
>         tristate "OMAP2+ Mailbox framework support"
> -       depends on ARCH_OMAP2PLUS || ARCH_K3
> +       depends on ARCH_OMAP2PLUS || ARCH_K3 || COMPILE_TEST
>         help
>           Mailbox implementation for OMAP family chips with hardware for
>           interprocessor communication involving DSP, IVA1.0 and IVA2 in
> diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c
> index 7a87424657a1..6797770474a5 100644
> --- a/drivers/mailbox/omap-mailbox.c
> +++ b/drivers/mailbox/omap-mailbox.c
> @@ -603,7 +603,7 @@ static struct platform_driver omap_mbox_driver = {
>         .driver = {
>                 .name = "omap-mailbox",
>                 .pm = &omap_mbox_pm_ops,
> -               .of_match_table = of_match_ptr(omap_mailbox_of_match),
> +               .of_match_table = omap_mailbox_of_match,
>         },
>  };
>  module_platform_driver(omap_mbox_driver);
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 0f0862e20a93..62f8548fb46a 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -330,8 +330,7 @@ config STM32_RPROC
>  config TI_K3_DSP_REMOTEPROC
>         tristate "TI K3 DSP remoteproc support"
>         depends on ARCH_K3
> -       select MAILBOX
> -       select OMAP2PLUS_MBOX
> +       depends on OMAP2PLUS_MBOX
>         help
>           Say m here to support TI's C66x and C71x DSP remote processor
>           subsystems on various TI K3 family of SoCs through the remote
> @@ -343,8 +342,8 @@ config TI_K3_DSP_REMOTEPROC
>  config TI_K3_M4_REMOTEPROC
>         tristate "TI K3 M4 remoteproc support"
>         depends on ARCH_K3 || COMPILE_TEST
> -       select MAILBOX
> -       select OMAP2PLUS_MBOX
> +       depends on TI_SCI_PROTOCOL || (COMPILE_TEST && TI_SCI_PROTOCOL=n)
> +       depends on OMAP2PLUS_MBOX
>
TI_K3_M4_REMOTEPROC isn't in the mainline yet so this fragment doesn't
apply on my tree.
I can drop just this and apply the rest of the patch, otherwise the
patch may go via remoteproc.
Let me know.
Thanks
-Jassi