linux-kernel - [PATCH v2 1/2] iommu/mediatek-v1: Allow building as module

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Message-ID: <20210326032337.24578-1-yong.wu@mediatek.com>
Date:   Fri, 26 Mar 2021 11:23:36 +0800
From:   Yong Wu <yong.wu@...iatek.com>
To:     Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Will Deacon <will@...nel.org>
CC:     Robin Murphy <robin.murphy@....com>,
        Tomasz Figa <tfiga@...omium.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <iommu@...ts.linux-foundation.org>,
        Krzysztof Kozlowski <krzk@...nel.org>, <yong.wu@...iatek.com>,
        <youlin.pei@...iatek.com>, Nicolas Boichat <drinkcat@...omium.org>,
        <anan.sun@...iatek.com>, <chao.hao@...iatek.com>
Subject: [PATCH v2 1/2] iommu/mediatek-v1: Allow building as module

This patch only adds support for building the IOMMU-v1 driver as module.
Correspondingly switch the config to tristate and update the iommu_ops's
owner to THIS_MODULE.

Signed-off-by: Yong Wu <yong.wu@...iatek.com>
---
v2: change note:
    a) Update iommu_ops's owner to THIS_MODULE
    b) Fix typo in the title from "Alloc" to "Allow"

v1: rebase on v5.12-rc2
---
 drivers/iommu/Kconfig        |  2 +-
 drivers/iommu/mtk_iommu_v1.c | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index 192ef8f61310..bc93da48bed0 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -364,7 +364,7 @@ config MTK_IOMMU
 	  If unsure, say N here.
 
 config MTK_IOMMU_V1
-	bool "MTK IOMMU Version 1 (M4U gen1) Support"
+	tristate "MediaTek IOMMU Version 1 (M4U gen1) Support"
 	depends on ARM
 	depends on ARCH_MEDIATEK || COMPILE_TEST
 	select ARM_DMA_USE_IOMMU
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 82ddfe9170d4..be1b20e3f20e 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -20,6 +20,7 @@
 #include <linux/iommu.h>
 #include <linux/iopoll.h>
 #include <linux/list.h>
+#include <linux/module.h>
 #include <linux/of_address.h>
 #include <linux/of_iommu.h>
 #include <linux/of_irq.h>
@@ -529,6 +530,7 @@ static const struct iommu_ops mtk_iommu_ops = {
 	.def_domain_type = mtk_iommu_def_domain_type,
 	.device_group	= generic_device_group,
 	.pgsize_bitmap	= ~0UL << MT2701_IOMMU_PAGE_SHIFT,
+	.owner          = THIS_MODULE,
 };
 
 static const struct of_device_id mtk_iommu_of_ids[] = {
@@ -691,9 +693,7 @@ static struct platform_driver mtk_iommu_driver = {
 		.pm = &mtk_iommu_pm_ops,
 	}
 };
+module_platform_driver(mtk_iommu_driver);
 
-static int __init m4u_init(void)
-{
-	return platform_driver_register(&mtk_iommu_driver);
-}
-subsys_initcall(m4u_init);
+MODULE_DESCRIPTION("IOMMU API for MediaTek M4U v1 implementations");
+MODULE_LICENSE("GPL v2");
-- 
2.18.0