[PATCH 2/2] iommu/rockchip: make clock handling optional

[Robin Murphy]

On 10/04/18 10:26, Heiko Stuebner wrote:
> 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 at sntech.de>
> ---
>   drivers/iommu/rockchip-iommu.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 5fc8656c60f9..7215c683cb8f 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -1176,8 +1176,12 @@ static int rk_iommu_probe(struct platform_device *pdev)
>   		iommu->clocks[i].id = rk_iommu_clocks[i];
>   
>   	err = devm_clk_bulk_get(iommu->dev, iommu->num_clocks, iommu->clocks);
> -	if (err)
> -		return err;
> +	if (err) {
> +		if (err == -ENOENT)
> +			iommu->num_clocks = 0;
> +		else
> +			return err;
> +	}

Nit: this might be a bit nicer as:

	if (err == -ENOENT)
		iommu->num_clocks = 0;
	else if (err)
		return err;

Either way,

Reviewed-by: Robin Murphy <robin.murphy at arm.com>

Thanks,
Robin.