linux-kernel - Re: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors

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Date:   Tue, 18 Jul 2023 13:43:44 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Biju Das <biju.das.jz@...renesas.com>
Cc:     Randy Dunlap <rd.dunlab@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors

On Tue, Jul 18, 2023 at 11:26:28AM +0000, Biju Das wrote:
> Hi Randy,
> 
> > -----Original Message-----
> > From: Randy Dunlap <rd.dunlab@...il.com>
> > Sent: Tuesday, July 18, 2023 7:41 AM
> > To: linux-kernel@...r.kernel.org; linux-pwm@...r.kernel.org
> > Cc: Biju Das <biju.das.jz@...renesas.com>; Thierry Reding
> > <thierry.reding@...il.com>; Uwe Kleine-König <u.kleine-
> > koenig@...gutronix.de>
> > Subject: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors
> > 
> > From: Randy Dunlap <rd.dunlab@...il.com>
> > 
> > When (MFD) RZ_MTU3=m and PWM_RZ_MTU3=y, there are numerous build errors:
> > 
> > ld: vmlinux.o: in function `rz_mtu3_pwm_config':
> > drivers/pwm/pwm-rz-mtu3.c:374: undefined reference to `rz_mtu3_disable'
> > ld: drivers/pwm/pwm-rz-mtu3.c:377: undefined reference to
> > `rz_mtu3_8bit_ch_write'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_write_tgr_registers':
> > drivers/pwm/pwm-rz-mtu3.c:110: undefined reference to
> > `rz_mtu3_16bit_ch_write'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_config':
> > drivers/pwm/pwm-rz-mtu3.c:382: undefined reference to
> > `rz_mtu3_8bit_ch_write'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_write_tgr_registers':
> > drivers/pwm/pwm-rz-mtu3.c:110: undefined reference to
> > `rz_mtu3_16bit_ch_write'
> > ld: drivers/pwm/pwm-rz-mtu3.c:111: undefined reference to
> > `rz_mtu3_16bit_ch_write'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_config':
> > drivers/pwm/pwm-rz-mtu3.c:397: undefined reference to `rz_mtu3_enable'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_disable':
> > drivers/pwm/pwm-rz-mtu3.c:259: undefined reference to
> > `rz_mtu3_8bit_ch_write'
> > ld: drivers/pwm/pwm-rz-mtu3.c:264: undefined reference to
> > `rz_mtu3_disable'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_enable':
> > drivers/pwm/pwm-rz-mtu3.c:230: undefined reference to
> > `rz_mtu3_8bit_ch_write'
> > ld: drivers/pwm/pwm-rz-mtu3.c:234: undefined reference to
> > `rz_mtu3_8bit_ch_write'
> > ld: drivers/pwm/pwm-rz-mtu3.c:238: undefined reference to `rz_mtu3_enable'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_is_ch_enabled':
> > drivers/pwm/pwm-rz-mtu3.c:155: undefined reference to `rz_mtu3_is_enabled'
> > ld: drivers/pwm/pwm-rz-mtu3.c:162: undefined reference to
> > `rz_mtu3_8bit_ch_read'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_read_tgr_registers':
> > drivers/pwm/pwm-rz-mtu3.c:102: undefined reference to
> > `rz_mtu3_16bit_ch_read'
> > ld: drivers/pwm/pwm-rz-mtu3.c:102: undefined reference to
> > `rz_mtu3_16bit_ch_read'
> > ld: drivers/pwm/pwm-rz-mtu3.c:103: undefined reference to
> > `rz_mtu3_16bit_ch_read'
> > ld: vmlinux.o: in function `rz_mtu3_pwm_get_state':
> > drivers/pwm/pwm-rz-mtu3.c:296: undefined reference to
> > `rz_mtu3_8bit_ch_read'
> > 
> > Modify the dependencies of PWM_RZ_MTU3 so that COMPILE_TEST is still
> > allowed but PWM_RZ_MTU3 depends on RZ_MTU3 if it is being built but also
> > allow the latter not to be built.
> > 
> > Fixes: 254d3a727421 ("pwm: Add Renesas RZ/G2L MTU3a PWM driver")
> > Signed-off-by: Randy Dunlap <rd.dunlab@...il.com
> > Cc: Biju Das <biju.das.jz@...renesas.com>
> > Cc: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
> > Cc: Thierry Reding <thierry.reding@...il.com>
> > Cc: linux-pwm@...r.kernel.org
> > ---
> > v2: fix typo in Subject;
> >     correct my email address while infradead.org is down;
> > 
> >  drivers/pwm/Kconfig |    3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> > 
> > diff -- a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> > --- a/drivers/pwm/Kconfig
> > +++ b/drivers/pwm/Kconfig
> > @@ -505,7 +505,8 @@ config PWM_ROCKCHIP
> > 
> >  config PWM_RZ_MTU3
> >  	tristate "Renesas RZ/G2L MTU3a PWM Timer support"
> > -	depends on RZ_MTU3 || COMPILE_TEST
> > +	depends on COMPILE_TEST
> > +	depends on RZ_MTU3 || RZ_MTU3=n
> >  	depends on HAS_IOMEM
> >  	help
> >  	  This driver exposes the MTU3a PWM Timer controller found in
> 
> 
> The below patch also works fine,
> 
> diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
> index 1c8dbb064ee5..56ab2f4b91fe 100644
> --- a/drivers/pwm/Kconfig
> +++ b/drivers/pwm/Kconfig
> @@ -505,7 +505,7 @@ config PWM_ROCKCHIP
>  
>  config PWM_RZ_MTU3
>         tristate "Renesas RZ/G2L MTU3a PWM Timer support"
> -       depends on RZ_MTU3 || COMPILE_TEST
> +       depends on RZ_MTU3 || (COMPILE_TEST && RZ_MTU3)

That's a bit pointless, isn't it? That effectively reduces to just:

	depends on RZ_MTU3

Thierry

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