Re: [PATCH v2 2/2] iommu/rockchip: Use devm_clk_bulk_get_all() to get multiple iface clock

[Shawn Lin]

在 2025/11/28 星期五 15:13, Chaoyi Chen 写道:
> From: Chaoyi Chen <chaoyi.chen@xxxxxxxxxxxxxx>
>
> The iommu found on RK3576 NPU and RK3576 RKVDEC contain 4 clock.
>
> Just use devm_clk_bulk_get_all() to get all the clocks and use them.

Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>

> Signed-off-by: Chaoyi Chen <chaoyi.chen@xxxxxxxxxxxxxx>
> ---
>
> Changes in v2:
> - Change comment.
>
>   drivers/iommu/rockchip-iommu.c | 20 ++++----------------
>   1 file changed, 4 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 0861dd469bd8..76f71fb679f8 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -93,11 +93,6 @@ struct rk_iommu_domain {
>   	struct iommu_domain domain;
>   };
>   
> -/* list of clocks required by IOMMU */
> -static const char * const rk_iommu_clocks[] = {
> -	"aclk", "iface",
> -};
> -
>   struct rk_iommu_ops {
>   	phys_addr_t (*pt_address)(u32 dte);
>   	u32 (*mk_dtentries)(dma_addr_t pt_dma);
> @@ -1236,25 +1231,18 @@ static int rk_iommu_probe(struct platform_device *pdev)
>   	iommu->reset_disabled = device_property_read_bool(dev,
>   					"rockchip,disable-mmu-reset");
>   
> -	iommu->num_clocks = ARRAY_SIZE(rk_iommu_clocks);
> -	iommu->clocks = devm_kcalloc(iommu->dev, iommu->num_clocks,
> -				     sizeof(*iommu->clocks), GFP_KERNEL);
> -	if (!iommu->clocks)
> -		return -ENOMEM;
> -
> -	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);
> +	err = devm_clk_bulk_get_all(dev, &iommu->clocks);
>   	if (err == -ENOENT)
>   		iommu->num_clocks = 0;
> -	else if (err)
> +	else if (err < 0)
>   		return err;
> +	else
> +		iommu->num_clocks = err;
>   
>   	err = clk_bulk_prepare(iommu->num_clocks, iommu->clocks);
>   	if (err)