diff options
| author | Yong Wu <yong.wu@mediatek.com> | 2021-01-11 14:18:59 +0300 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2021-02-01 14:31:18 +0300 |
| commit | baf94e6ebff9622f60c4a87ff59c85bf756b7e20 (patch) | |
| tree | 2d8ec019c85b7e1aa894ae7ac4f5e65fd1f15566 /drivers/iommu/mtk_iommu.c | |
| parent | 986d9ec5f176ff1a539e849d57b3d6ecc937c4a6 (diff) | |
| download | linux-baf94e6ebff9622f60c4a87ff59c85bf756b7e20.tar.xz | |
iommu/mediatek: Add device link for smi-common and m4u
In the lastest SoC, M4U has its special power domain. thus, If the engine
begin to work, it should help enable the power for M4U firstly.
Currently if the engine work, it always enable the power/clocks for
smi-larbs/smi-common. This patch adds device_link for smi-common and M4U.
then, if smi-common power is enabled, the M4U power also is powered on
automatically.
Normally M4U connect with several smi-larbs and their smi-common always
are the same, In this patch it get smi-common dev from the last smi-larb
device, then add the device_link.
Signed-off-by: Yong Wu <yong.wu@mediatek.com>
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Link: https://lore.kernel.org/r/20210111111914.22211-19-yong.wu@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>
Diffstat (limited to 'drivers/iommu/mtk_iommu.c')
| -rw-r--r-- | drivers/iommu/mtk_iommu.c | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 189165e7a2ab..0fe7c1617dc3 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -20,6 +20,7 @@ #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> +#include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/slab.h> #include <linux/spinlock.h> @@ -633,6 +634,9 @@ static int mtk_iommu_probe(struct platform_device *pdev) { struct mtk_iommu_data *data; struct device *dev = &pdev->dev; + struct device_node *larbnode, *smicomm_node; + struct platform_device *plarbdev; + struct device_link *link; struct resource *res; resource_size_t ioaddr; struct component_match *match = NULL; @@ -699,8 +703,6 @@ static int mtk_iommu_probe(struct platform_device *pdev) return larb_nr; for (i = 0; i < larb_nr; i++) { - struct device_node *larbnode; - struct platform_device *plarbdev; u32 id; larbnode = of_parse_phandle(dev->of_node, "mediatek,larbs", i); @@ -727,12 +729,28 @@ static int mtk_iommu_probe(struct platform_device *pdev) compare_of, larbnode); } + /* Get smi-common dev from the last larb. */ + smicomm_node = of_parse_phandle(larbnode, "mediatek,smi", 0); + if (!smicomm_node) + return -EINVAL; + + plarbdev = of_find_device_by_node(smicomm_node); + of_node_put(smicomm_node); + data->smicomm_dev = &plarbdev->dev; + + link = device_link_add(data->smicomm_dev, dev, + DL_FLAG_STATELESS | DL_FLAG_PM_RUNTIME); + if (!link) { + dev_err(dev, "Unable link %s.\n", dev_name(data->smicomm_dev)); + return -EINVAL; + } + platform_set_drvdata(pdev, data); ret = iommu_device_sysfs_add(&data->iommu, dev, NULL, "mtk-iommu.%pa", &ioaddr); if (ret) - return ret; + goto out_link_remove; iommu_device_set_ops(&data->iommu, &mtk_iommu_ops); iommu_device_set_fwnode(&data->iommu, &pdev->dev.of_node->fwnode); @@ -762,6 +780,8 @@ out_list_del: iommu_device_unregister(&data->iommu); out_sysfs_remove: iommu_device_sysfs_remove(&data->iommu); +out_link_remove: + device_link_remove(data->smicomm_dev, dev); return ret; } @@ -776,6 +796,7 @@ static int mtk_iommu_remove(struct platform_device *pdev) bus_set_iommu(&platform_bus_type, NULL); clk_disable_unprepare(data->bclk); + device_link_remove(data->smicomm_dev, &pdev->dev); devm_free_irq(&pdev->dev, data->irq, data); component_master_del(&pdev->dev, &mtk_iommu_com_ops); return 0; |