From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yong Wu Subject: [PATCH v5 07/20] iommu/mediatek: Add bclk can be supported optionally Date: Tue, 1 Jan 2019 11:55:39 +0800 Message-ID: <1546314952-15990-8-git-send-email-yong.wu@mediatek.com> References: <1546314952-15990-1-git-send-email-yong.wu@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1546314952-15990-1-git-send-email-yong.wu@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: Joerg Roedel , Matthias Brugger , Robin Murphy , Rob Herring Cc: Tomasz Figa , Will Deacon , linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, iommu@lists.linux-foundation.org, arnd@arndb.de, yingjoe.chen@mediatek.com, yong.wu@mediatek.com, youlin.pei@mediatek.com, Nicolas Boichat List-Id: iommu@lists.linux-foundation.org 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 --- 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 ae1aa5a..847082c 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -613,9 +613,11 @@ 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); @@ -739,11 +741,13 @@ 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