@@ -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[] = {
@@ -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;
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@mediatek.com> --- drivers/iommu/mtk_iommu.c | 10 +++++++--- drivers/iommu/mtk_iommu.h | 3 +++ 2 files changed, 10 insertions(+), 3 deletions(-)