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iommu/mediatek: Add bclk can be supported optionally 

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>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yong Wu 2019-08-24 11:01:56 +08:00 committed by Joerg Roedel
parent b4dad40e4f
commit 2aa4c2597c
2 changed files with 10 additions and 3 deletions
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10
drivers/iommu/mtk_iommu.c
View File

@ -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 const struct dev_pm_ops mtk_iommu_pm_ops = {
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[] = {

3
drivers/iommu/mtk_iommu.h
View File

@ -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;