linux-kernel - Re: [PATCH] reset: meson: make it possible to build as a module

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Message-ID: <7hd01h295j.fsf@baylibre.com>
Date:   Fri, 16 Oct 2020 13:44:24 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Neil Armstrong <narmstrong@...libre.com>, p.zabel@...gutronix.de
Cc:     linux-amlogic@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Neil Armstrong <narmstrong@...libre.com>
Subject: Re: [PATCH] reset: meson: make it possible to build as a module

Neil Armstrong <narmstrong@...libre.com> writes:

> In order to reduce the kernel Image size on multi-platform distributions,
> make it possible to build the reset controller driver as a module.
>
> This partially reverts 8290924e ("reset: meson: make it explicitly non-modular")
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
> ---
>  drivers/reset/Kconfig       | 4 ++--
>  drivers/reset/reset-meson.c | 7 ++++++-
>  2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig
> index d9efbfd29646..ab315617565f 100644
> --- a/drivers/reset/Kconfig
> +++ b/drivers/reset/Kconfig
> @@ -94,8 +94,8 @@ config RESET_LPC18XX
>  	  This enables the reset controller driver for NXP LPC18xx/43xx SoCs.
>  
>  config RESET_MESON
> -	bool "Meson Reset Driver" if COMPILE_TEST
> -	default ARCH_MESON
> +	tristate "Meson Reset Driver"
> +	default ARCH_MESON || COMPILE_TEST
>  	help
>  	  This enables the reset driver for Amlogic Meson SoCs.
>  
> diff --git a/drivers/reset/reset-meson.c b/drivers/reset/reset-meson.c
> index 94d7ba88d7d2..434d5c0f877e 100644
> --- a/drivers/reset/reset-meson.c
> +++ b/drivers/reset/reset-meson.c
> @@ -9,6 +9,7 @@
>  #include <linux/init.h>
>  #include <linux/io.h>
>  #include <linux/of.h>
> +#include <linux/module.h>
>  #include <linux/platform_device.h>
>  #include <linux/reset-controller.h>
>  #include <linux/slab.h>
> @@ -142,4 +143,8 @@ static struct platform_driver meson_reset_driver = {
>  		.of_match_table	= meson_reset_dt_ids,
>  	},
>  };
> -builtin_platform_driver(meson_reset_driver);
> +module_platform_driver(meson_reset_driver);

I tried this as as a module, and it never probed because it's missing
this on the compatible table:

   MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);

With that minor change:

Reviewed-by: Kevin Hilman <khilman@...libre.com>
Tested-by: Kevin Hilman <khilman@...libre.com>

Kevin