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Date:   Tue, 28 Mar 2023 16:48:20 +0530
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Subject: Re: [PATCH V3 1/2] arm64: dts: ti: k3-j721s2-mcu-wakeup: Fix IO
 PADCONFIG size for wakeup domain
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To:     Sinthu Raja <sinthu.raja@mistralsolutions.com>,
        Nishanth Menon <nm@ti.com>, Tero Kristo <kristo@kernel.org>,
        Rob Herring <robh+dt@kernel.org>
CC:     Vignesh Raghavendra <vigneshr@ti.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        Sinthu Raja <sinthu.raja@ti.com>,
        Vaishnav Achath <vaishnav.a@ti.com>
References: <20230316114102.3602-1-sinthu.raja@ti.com>
 <20230316114102.3602-2-sinthu.raja@ti.com>
From:   Vaishnav Achath <vaishnav.a@ti.com>
In-Reply-To: <20230316114102.3602-2-sinthu.raja@ti.com>
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Hi Sinthu,

On 16/03/23 17:11, Sinthu Raja wrote:
> From: Sinthu Raja <sinthu.raja@ti.com>
> 
> The size of wkup domain I/O PADCONFIG register set is incorrect for J721S2.
> Therefore, update the PADCONFIG total offset size to the correct value for
> J721S22 SoC.
> 
> Fixes: b8545f9d3a54 ("arm64: dts: ti: Add initial support for J721S2 SoC")
> Signed-off-by: Sinthu Raja <sinthu.raja@ti.com>
> ---
> 
> Changes in V3:
> - Added Fix tag
> 
> Changes in V2:
> - Update commit description.
> - Update the offset value to 0x194 because 0x190 is the last register of the
>   IO PADCONFIG register set.
> 

The existing PADCONFIG register region descriptions in the pinctrl nodes seems
to be incorrect for j721s2-main and j721s2-mcu-wakeup due to non-addressable
holes in the region which causes bus aborts when the registers are read and
causes system crash if we read something like,
/sys/kernel/debug/pinctrl/4301c000.pinctrl-pinctrl-single/pins

This is what I saw from inspection of the datasheet:

* WKUP_PADCONFIG13, WKUP_PADCONFIG25 missing in WKUP_PADCONFIG region
* MAIN_PADCONFIG 64-68 missing in MAIN_PADCONFIG region

I have verified that your patch does not introduce new issues, but since it is a
Fix patch, I will defer the decision to the maintainers on whether we should
split the nodes to avoid non-addressable regions and fix it completely here or
later do a fix for the split.

Thanks and Regards,
Vaishnav

>  arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> index 0af242aa9816..b10f1e8b98e6 100644
> --- a/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-j721s2-mcu-wakeup.dtsi
> @@ -50,7 +50,7 @@ mcu_ram: sram@41c00000 {
>  	wkup_pmx0: pinctrl@4301c000 {
>  		compatible = "pinctrl-single";
>  		/* Proxy 0 addressing */
> -		reg = <0x00 0x4301c000 0x00 0x178>;
> +		reg = <0x00 0x4301c000 0x00 0x194>;
>  		#pinctrl-cells = <1>;
>  		pinctrl-single,register-width = <32>;
>  		pinctrl-single,function-mask = <0xffffffff>;

-- 
Regards,
Vaishnav