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

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Message-ID: <TYWPR01MB877550F95CF000B63E9AD022C238A@TYWPR01MB8775.jpnprd01.prod.outlook.com>
Date:   Tue, 18 Jul 2023 12:13:01 +0000
From:   Fabrizio Castro <fabrizio.castro.jz@...esas.com>
To:     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>
CC:     Biju Das <biju.das.jz@...renesas.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
Subject: RE: [PATCH v2] pwm: fix pwm-rz-mtu3.c build errors

Hi Randy,

> From: Randy Dunlap <rd.dunlab@...il.com>
> 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

Isn't this a tautology?

Cheers,
Fab

>  	depends on HAS_IOMEM
>  	help
>  	  This driver exposes the MTU3a PWM Timer controller found in
> Renesas