Re: [PATCH v4 08/22] arm64: dts: mt8192: Add infracfg_rst node

From: "Nícolas F. R. A. Prado" <nfraprado@collabora.com>
To: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>,
	Project_Global_Chrome_Upstream_Group@mediatek.com,
	devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org,
	Chen-Yu Tsai <wenst@chromium.org>,
	Ryder Lee <ryder.lee@kernel.org>, Hui Liu <hui.liu@mediatek.com>
Subject: Re: [PATCH v4 08/22] arm64: dts: mt8192: Add infracfg_rst node
Date: Tue, 22 Mar 2022 17:57:54 -0400	[thread overview]
Message-ID: <20220322215754.j2hzutm775hvr25n@notapiano> (raw)
In-Reply-To: <20220318144534.17996-9-allen-kh.cheng@mediatek.com>

Hi Allen,

please see my comment below.

On Fri, Mar 18, 2022 at 10:45:20PM +0800, Allen-KH Cheng wrote:
> Add infracfg_rst node for mt8192 SoC.
>  - Add simple-mfd to allow probing the ti,syscon-reset node.
> 
> Signed-off-by: Allen-KH Cheng <allen-kh.cheng@mediatek.com>
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
> ---
>  arch/arm64/boot/dts/mediatek/mt8192.dtsi | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/mediatek/mt8192.dtsi b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> index 40cf6dacca3e..82de1af3f6aa 100644
> --- a/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> +++ b/arch/arm64/boot/dts/mediatek/mt8192.dtsi
> @@ -12,6 +12,7 @@
>  #include <dt-bindings/pinctrl/mt8192-pinfunc.h>
>  #include <dt-bindings/phy/phy.h>
>  #include <dt-bindings/power/mt8192-power.h>
> +#include <dt-bindings/reset/ti-syscon.h>
>  
>  / {
>  	compatible = "mediatek,mt8192";
> @@ -267,10 +268,23 @@
>  			#clock-cells = <1>;
>  		};
>  
> -		infracfg: syscon@10001000 {
> -			compatible = "mediatek,mt8192-infracfg", "syscon";
> +		infracfg: infracfg@10001000 {
> +			compatible = "mediatek,mt8192-infracfg", "syscon", "simple-mfd";
>  			reg = <0 0x10001000 0 0x1000>;
>  			#clock-cells = <1>;
> +
> +			infracfg_rst: reset-controller {
> +				compatible = "ti,syscon-reset";
> +				#reset-cells = <1>;
> +
> +				ti,reset-bits = <
> +					0x120 0 0x124 0 0 0	(ASSERT_SET | DEASSERT_SET | STATUS_NONE) /* 0: lvts_ap */
> +					0x730 12 0x734 12 0 0	(ASSERT_SET | DEASSERT_SET | STATUS_NONE) /* 1: lvts_mcu */
> +					0x140 15 0x144 15 0 0	(ASSERT_SET | DEASSERT_SET | STATUS_NONE) /* 2: pcie phy */
> +					0x730 1 0x734 1 0 0	(ASSERT_SET | DEASSERT_SET | STATUS_NONE) /* 3: pcie top */
> +					0x150 5 0x154 5 0 0	(ASSERT_SET | DEASSERT_SET | STATUS_NONE) /* 4: svs */
> +				>;

If you see [1], Rob has previously said that there shouldn't be new users of the
ti,reset-bits property. I suggest doing like proposed on [2]: moving these bit
definitions to the reset-ti-syscon driver, and have them selected through the
compatible. You'd need to add a mt8192 specific compatible here too for that.

[1] https://lore.kernel.org/all/CAL_JsqJq6gqoXtvG1U7UDsOQpz7oMLMunZHq2njN6nvPr8PZMA@mail.gmail.com/
[2] https://lore.kernel.org/all/CAATdQgA5pKhjOf5gxo+h7cs7kCts3DeKGU5axeX2t+OaJFHyBg@mail.gmail.com/

Thanks,
Nícolas

> +			};
>  		};
>  
>  		pericfg: syscon@10003000 {
> -- 
> 2.18.0
> 
> 