[v11,11/23] iommu/mediatek: Add bclk can be supported optionally
diff mbox series

Message ID 1566615728-26388-12-git-send-email-yong.wu@mediatek.com
State Mainlined
Commit 2aa4c2597cd67139697eb3095d5b6d61074c7ffc
Headers show
Series
  • MT8183 IOMMU SUPPORT
Related show

Commit Message

Yong Wu Aug. 24, 2019, 3:01 a.m. UTC
In some SoCs, M4U doesn't have its "bclk", it will use the EMI
clock instead which has always been enabled when entering kernel.

Currently mt2712 and mt8173 have this bclk while mt8183 doesn't.

This also is a preparing patch for mt8183.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Evan Green <evgreen@chromium.org>
Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com>
---
 drivers/iommu/mtk_iommu.c | 10 +++++++---
 drivers/iommu/mtk_iommu.h |  3 +++
 2 files changed, 10 insertions(+), 3 deletions(-)

Patch
diff mbox series

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index b5a40a4..4df3cb4 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -633,9 +633,11 @@  static int mtk_iommu_probe(struct platform_device *pdev)
 	if (data->irq < 0)
 		return data->irq;
 
-	data->bclk = devm_clk_get(dev, "bclk");
-	if (IS_ERR(data->bclk))
-		return PTR_ERR(data->bclk);
+	if (data->plat_data->has_bclk) {
+		data->bclk = devm_clk_get(dev, "bclk");
+		if (IS_ERR(data->bclk))
+			return PTR_ERR(data->bclk);
+	}
 
 	larb_nr = of_count_phandle_with_args(dev->of_node,
 					     "mediatek,larbs", NULL);
@@ -763,11 +765,13 @@  static int __maybe_unused mtk_iommu_resume(struct device *dev)
 static const struct mtk_iommu_plat_data mt2712_data = {
 	.m4u_plat     = M4U_MT2712,
 	.has_4gb_mode = true,
+	.has_bclk     = true,
 };
 
 static const struct mtk_iommu_plat_data mt8173_data = {
 	.m4u_plat     = M4U_MT8173,
 	.has_4gb_mode = true,
+	.has_bclk     = true,
 };
 
 static const struct of_device_id mtk_iommu_of_ids[] = {
diff --git a/drivers/iommu/mtk_iommu.h b/drivers/iommu/mtk_iommu.h
index c281c01..821172b 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h
@@ -35,6 +35,9 @@  enum mtk_iommu_plat {
 struct mtk_iommu_plat_data {
 	enum mtk_iommu_plat m4u_plat;
 	bool                has_4gb_mode;
+
+	/* HW will use the EMI clock if there isn't the "bclk". */
+	bool                has_bclk;
 };
 
 struct mtk_iommu_domain;