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iommu/rockchip: Make clock handling optional

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iommu clocks are optional, so the driver should not fail if they are not
present. Instead just set the number of clocks to 0, which the clk-blk APIs
can handle just fine.

Fixes: f2e3a5f557ad ("iommu/rockchip: Control clocks needed to access the IOMMU")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Heiko Stuebner 2018-04-17 14:09:15 +02:00 committed by Joerg Roedel
parent 94c793acca
commit 2f8c7f2e76
1 changed files with 8 additions and 1 deletions
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9
drivers/iommu/rockchip-iommu.c
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@ -1175,8 +1175,15 @@ static int rk_iommu_probe(struct platform_device *pdev)
for (i = 0; i < iommu->num_clocks; ++i)
iommu->clocks[i].id = rk_iommu_clocks[i];
/*
* iommu clocks should be present for all new devices and devicetrees
* but there are older devicetrees without clocks out in the wild.
* So clocks as optional for the time being.
*/
err = devm_clk_bulk_get(iommu->dev, iommu->num_clocks, iommu->clocks);
if (err)
if (err == -ENOENT)
iommu->num_clocks = 0;
else if (err)
return err;
err = clk_bulk_prepare(iommu->num_clocks, iommu->clocks);