linux-kernel - Re: [PATCH] mfd: rz-mtu3: link time dependencies

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Message-ID: <ZLlMAZPzEmSlzlbV@orome>
Date:   Thu, 20 Jul 2023 17:00:17 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     William Breathitt Gray <william.gray@...aro.org>,
        Lee Jones <lee@...nel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Biju Das <biju.das.jz@...renesas.com>,
        Arnd Bergmann <arnd@...db.de>,
        Peter Robinson <pbrobinson@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pwm@...r.kernel.org
Subject: Re: [PATCH] mfd: rz-mtu3: link time dependencies

On Wed, Jul 19, 2023 at 11:02:23AM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The new set of drivers for RZ/G2L MTU3a tries to enable compile-testing the
> individual client drivers even when the MFD portion is disabled but gets it
> wrong, causing a link failure when the core is in a loadable module but the
> other drivers are built-in:
> 
> x86_64-linux-ld: drivers/pwm/pwm-rz-mtu3.o: in function `rz_mtu3_pwm_apply':
> pwm-rz-mtu3.c:(.text+0x4bf): undefined reference to `rz_mtu3_8bit_ch_write'
> x86_64-linux-ld: pwm-rz-mtu3.c:(.text+0x509): undefined reference to `rz_mtu3_disable'
> 
> arm-linux-gnueabi-ld: drivers/counter/rz-mtu3-cnt.o: in function `rz_mtu3_cascade_counts_enable_get':
> rz-mtu3-cnt.c:(.text+0xbec): undefined reference to `rz_mtu3_shared_reg_read'
> 
> It seems better not to add the extra complexity here but instead just use
> a normal hard dependency, so remove the #else portion in the header along
> with the "|| COMPILE_TEST". This could also be fixed by having slightly more
> elaborate Kconfig dependencies or using the cursed 'IS_REACHABLE()' helper,
> but in practice it's already possible to compile-test all these drivers
> by enabling the mtd portion.
> 
> Fixes: 254d3a727421c ("pwm: Add Renesas RZ/G2L MTU3a PWM driver")
> Fixes: 0be8907359df4 ("counter: Add Renesas RZ/G2L MTU3a counter driver")
> Fixes: 654c293e1687b ("mfd: Add Renesas RZ/G2L MTU3a core driver")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/counter/Kconfig     |  2 +-
>  drivers/pwm/Kconfig         |  2 +-
>  include/linux/mfd/rz-mtu3.h | 66 -------------------------------------
>  3 files changed, 2 insertions(+), 68 deletions(-)

Assuming that Lee will pick this up:

Acked-by: Thierry Reding <thierry.reding@...il.com>

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