On 10/06/2019 14:17, Yong Wu wrote:
> 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...@mediatek.com>
> Reviewed-by: Evan Green <evgr...@chromium.org>
Reviewed-by: Matthias Brugger <matthias....@gmail.com>
> ---
> 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 aff5004..264dda4 100644
> --- a/drivers/iommu/mtk_iommu.c
> +++ b/drivers/iommu/mtk_iommu.c
> @@ -611,9 +611,11 @@ 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);
> @@ -741,11 +743,13 @@ 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 d7a001a..63e235e 100644
> --- a/drivers/iommu/mtk_iommu.h
> +++ b/drivers/iommu/mtk_iommu.h
> @@ -43,6 +43,9 @@ 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;
>
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