[PATCH v4 07/18] iommu/mediatek: Add bclk can be supported optionally
From: Yong Wu <hidden>
Date: 2018-12-08 08:41:59
Also in:
linux-arm-kernel, linux-iommu, linux-mediatek, lkml
Subsystem:
iommu subsystem, mediatek iommu driver, the rest · Maintainers:
Joerg Roedel, Will Deacon, Yong Wu, Linus Torvalds
In some SoCs, M4U doesn't have its "bclk", it will use the EMI clock instead which has always been enabled when entering kernel. This also is a preparing patch for mt8183. Signed-off-by: Yong Wu <yong.wu-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org> --- drivers/iommu/mtk_iommu.c | 10 +++++++--- drivers/iommu/mtk_iommu.h | 3 +++ 2 files changed, 10 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 8eb110e..eda062a 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c@@ -610,9 +610,11 @@ 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);
@@ -736,11 +738,13 @@ 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 5890e55..b8749ac 100644
--- a/drivers/iommu/mtk_iommu.h
+++ b/drivers/iommu/mtk_iommu.h@@ -44,6 +44,9 @@ 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;
--
1.9.1