linux-kernel - RE: [PATCH V2 1/3] reset: imx7: Support module build

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Message-ID: <DB3PR0402MB39169C591725C7ABAA121DCAF57B0@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Mon, 20 Jul 2020 13:52:42 +0000
From:   Anson Huang <anson.huang@....com>
To:     Philipp Zabel <p.zabel@...gutronix.de>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Leo Li <leoyang.li@....com>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "geert+renesas@...der.be" <geert+renesas@...der.be>,
        "olof@...om.net" <olof@...om.net>,
        "treding@...dia.com" <treding@...dia.com>,
        "gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
        "amurray@...goodpenguin.co.uk" <amurray@...goodpenguin.co.uk>,
        "vidyas@...dia.com" <vidyas@...dia.com>,
        "xiaowei.bao@....com" <xiaowei.bao@....com>,
        "jonnyc@...zon.com" <jonnyc@...zon.com>,
        "hayashi.kunihiko@...ionext.com" <hayashi.kunihiko@...ionext.com>,
        "eswara.kota@...ux.intel.com" <eswara.kota@...ux.intel.com>,
        "krzk@...nel.org" <krzk@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH V2 1/3] reset: imx7: Support module build

Hi, Philipp


> Subject: Re: [PATCH V2 1/3] reset: imx7: Support module build
> 
> On Mon, 2020-06-29 at 23:05 +0800, Anson Huang wrote:
> > Add module device table, author, description and license to support
> > module build, and CONFIG_RESET_IMX7 is changed to default 'y' ONLY for
> > i.MX7D, other platforms need to select it in defconfig.
> >
> > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > ---
> > Changes since V1:
> > 	- make it default 'y' for SOC_IMX7D;
> > 	- add module author, description;
> > 	- use device_initcall instead of builtin_platform_driver() to support
> > 	  module unload.
> > ---
> >  drivers/reset/Kconfig      |  5 +++--
> >  drivers/reset/reset-imx7.c | 14 ++++++++++++--
> >  2 files changed, 15 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index
> > d9efbfd..19f9773 100644
> > --- a/drivers/reset/Kconfig
> > +++ b/drivers/reset/Kconfig
> > @@ -65,9 +65,10 @@ config RESET_HSDK
> >  	  This enables the reset controller driver for HSDK board.
> >
> >  config RESET_IMX7
> > -	bool "i.MX7/8 Reset Driver" if COMPILE_TEST
> > +	tristate "i.MX7/8 Reset Driver"
> >  	depends on HAS_IOMEM
> > -	default SOC_IMX7D || (ARM64 && ARCH_MXC)
> > +	depends on SOC_IMX7D || (ARM64 && ARCH_MXC) || COMPILE_TEST
> > +	default y if SOC_IMX7D
> >  	select MFD_SYSCON
> >  	help
> >  	  This enables the reset controller driver for i.MX7 SoCs.
> > diff --git a/drivers/reset/reset-imx7.c b/drivers/reset/reset-imx7.c
> > index d170fe6..c710f789 100644
> > --- a/drivers/reset/reset-imx7.c
> > +++ b/drivers/reset/reset-imx7.c
> > @@ -8,7 +8,7 @@
> >   */
> >
> >  #include <linux/mfd/syscon.h>
> > -#include <linux/mod_devicetable.h>
> > +#include <linux/module.h>
> >  #include <linux/of_device.h>
> >  #include <linux/platform_device.h>
> >  #include <linux/reset-controller.h>
> > @@ -386,6 +386,7 @@ static const struct of_device_id imx7_reset_dt_ids[]
> = {
> >  	{ .compatible = "fsl,imx8mp-src", .data = &variant_imx8mp },
> >  	{ /* sentinel */ },
> >  };
> > +MODULE_DEVICE_TABLE(of, imx7_reset_dt_ids);
> >
> >  static struct platform_driver imx7_reset_driver = {
> >  	.probe	= imx7_reset_probe,
> > @@ -394,4 +395,13 @@ static struct platform_driver imx7_reset_driver = {
> >  		.of_match_table	= imx7_reset_dt_ids,
> >  	},
> >  };
> > -builtin_platform_driver(imx7_reset_driver);
> > +
> > +static int __init imx7_reset_init(void) {
> > +	return platform_driver_register(&imx7_reset_driver);
> > +}
> > +device_initcall(imx7_reset_init);
> 
> Shouldn't this use module_platform_driver instead?

Agreed, module_platform_driver() is better, will improve it in V3.

Thanks,
Anson