linux-kernel - Re: [PATCH 1/9] iommu/rockchip: Add compatible for rockchip,rk3588-iommu

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Date: Thu, 13 Jun 2024 01:37:20 +0200
From: Sebastian Reichel <sebastian.reichel@...labora.com>
To: Tomeu Vizoso <tomeu@...euvizoso.net>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Robin Murphy <robin.murphy@....com>, Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Oded Gabbay <ogabbay@...nel.org>, Tomeu Vizoso <tomeu.vizoso@...euvizoso.net>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Philipp Zabel <p.zabel@...gutronix.de>, 
	Sumit Semwal <sumit.semwal@...aro.org>, Christian König <christian.koenig@....com>, 
	iommu@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, 
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org, devicetree@...r.kernel.org, 
	dri-devel@...ts.freedesktop.org, linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH 1/9] iommu/rockchip: Add compatible for
 rockchip,rk3588-iommu

Hello Tomeu,

On Wed, Jun 12, 2024 at 03:52:54PM GMT, Tomeu Vizoso wrote:
> So far, seems to be fully compatible with the one in the RK3568.
> 
> The bindings already had this compatible, but the driver didn't
> advertise it.
> 
> Signed-off-by: Tomeu Vizoso <tomeu@...euvizoso.net>
> ---

The driver does not need to advise it, since it already handles
"rockchip,rk3568-iommu" and the correct compatible for the RK3588
IOMMU is:

compatible = "rockchip,rk3588-iommu", "rockchip,rk3568-iommu";

i.e. with the RK3568 compatible as fallback. So the kernel will
just bind to the fallback compatible. Iff differences are found
in the future, the kernel can start to make use of the more
specific compatible.

-- Sebastian

>  drivers/iommu/rockchip-iommu.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
> index 4b369419b32c..f5629515bd78 100644
> --- a/drivers/iommu/rockchip-iommu.c
> +++ b/drivers/iommu/rockchip-iommu.c
> @@ -1363,6 +1363,9 @@ static const struct of_device_id rk_iommu_dt_ids[] = {
>  	{	.compatible = "rockchip,rk3568-iommu",
>  		.data = &iommu_data_ops_v2,
>  	},
> +	{	.compatible = "rockchip,rk3588-iommu",
> +		.data = &iommu_data_ops_v2,
> +	},
>  	{ /* sentinel */ }
>  };
>  
> 
> -- 
> 2.45.2
> 
> 

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