linux-kernel - RE: [PATCH] arm64: dts: renesas: rzt2h/rzn2h-evk: add note about SD1 1.8V modes

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Message-ID:
 <TYYPR01MB13955C3E9A7B48C7704EA3C8D85D5A@TYYPR01MB13955.jpnprd01.prod.outlook.com>
Date: Fri, 21 Nov 2025 10:09:02 +0000
From: Cosmin-Gabriel Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
To: Geert Uytterhoeven <geert+renesas@...der.be>
CC: magnus.damm <magnus.damm@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
	"linux-renesas-soc@...r.kernel.org" <linux-renesas-soc@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Cosmin-Gabriel
 Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
Subject: RE: [PATCH] arm64: dts: renesas: rzt2h/rzn2h-evk: add note about SD1
 1.8V modes

Hello Geert, could you please review / pick this patch up too?

> -----Original Message-----
> From: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
> Sent: Wednesday, October 22, 2025 10:32 AM
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>; magnus.damm <magnus.damm@...il.com>; Rob Herring
> <robh@...nel.org>; Krzysztof Kozlowski <krzk+dt@...nel.org>; Conor Dooley <conor+dt@...nel.org>; linux-
> renesas-soc@...r.kernel.org; devicetree@...r.kernel.org; linux-kernel@...r.kernel.org; Cosmin-Gabriel
> Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
> Subject: [PATCH] arm64: dts: renesas: rzt2h/rzn2h-evk: add note about SD1 1.8V modes
> 
> 1.8V operation of SD1 requires the jumper to be placed on the correct
> pins of a connector on these Evaluation Kits. 1.8V is needed to achieve
> the higher rated speeds like SDR104. Add a note about it to make sure no
> one else spends too much time figuring this out.
> 
> Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@...esas.com>
> ---
>  arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts | 3 +++
>  arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts | 3 +++
>  2 files changed, 6 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
> b/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
> index e94b84393bd9..7269bca8c8cc 100644
> --- a/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
> +++ b/arch/arm64/boot/dts/renesas/r9a09g077m44-rzt2h-evk.dts
> @@ -26,6 +26,9 @@
>   * P17_4 = SD1_CD; SW2[3] = ON
>   * P08_5 = SD1_PWEN; SW2[3] = ON
>   * P08_6 = SD1_IOVS; SW2[3] = ON; SW5[3] = OFF; SW5[4] = ON
> + * To enable proper operation in 1.8V modes, CN77 must have pins 2 and 3
> + * connected by the jumper. This connects SD1 power-supply control IC output
> + * back to VCC1833_7.
>   */
>  #define SD1_MICRO_SD	1
> 
> diff --git a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
> b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
> index d27da157c6d6..c87cb6510edc 100644
> --- a/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
> +++ b/arch/arm64/boot/dts/renesas/r9a09g087m44-rzn2h-evk.dts
> @@ -30,6 +30,9 @@
>  /*
>   * P17_4 = SD1_CD; DSW5[3] = ON; DSW19[1] = OFF; DSW19[2] = ON
>   * P08_6 = SD1_IOVS; DSW5[3] = ON
> + * To enable proper operation in 1.8V modes, JP21 must have pins 2 and 3
> + * connected by the jumper. This connects SD1 power-supply control IC output
> + * back to VCC1833_7.
>   */
>  #define SD1_MICRO_SD	1
> 
> --
> 2.51.1.dirty