linux-kernel - Re: [PATCH v3 6/6] riscv: dts: starfive: add Milkv Mars board device tree

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Message-ID: <CAJM55Z_BemQoQ8Qrcz_vYOJ3n+-3DKn_iu==58euv9HWa99dEw@mail.gmail.com>
Date: Fri, 19 Apr 2024 15:11:47 -0700
From: Emil Renner Berthing <emil.renner.berthing@...onical.com>
To: Jisheng Zhang <jszhang@...nel.org>, 
	Heinrich Schuchardt <heinrich.schuchardt@...onical.com>
Cc: Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Emil Renner Berthing <kernel@...il.dk>, linux-riscv@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Conor Dooley <conor@...nel.org>, Aurelien Jarno <aurelien@...el32.net>
Subject: Re: [PATCH v3 6/6] riscv: dts: starfive: add Milkv Mars board device tree

Jisheng Zhang wrote:
> On Mon, Apr 01, 2024 at 03:28:33PM +0200, Heinrich Schuchardt wrote:
> > On 3/29/24 03:31, Jisheng Zhang wrote:
> > > On Thu, Mar 28, 2024 at 10:28:28PM +0100, Heinrich Schuchardt wrote:
> > > > On 2/6/24 20:13, Conor Dooley wrote:
> > > > > On Wed, Jan 31, 2024 at 09:26:00PM +0800, Jisheng Zhang wrote:
> > > > > > The Milkv Mars is a development board based on the Starfive JH7110 SoC.
> > > > > > The board features:
> > > > > >
> > > > > > - JH7110 SoC
> > > > > > - 1/2/4/8 GiB LPDDR4 DRAM
> > > > > > - AXP15060 PMIC
> > > > > > - 40 pin GPIO header
> > > > > > - 3x USB 3.0 host port
> > > > > > - 1x USB 2.0 host port
> > > > > > - 1x M.2 E-Key
> > > > > > - 1x eMMC slot
> > > > > > - 1x MicroSD slot
> > > > > > - 1x QSPI Flash
> > > > > > - 1x 1Gbps Ethernet port
> > > > > > - 1x HDMI port
> > > > > > - 1x 2-lane DSI and 1x 4-lane DSI
> > > > > > - 1x 2-lane CSI
> > > > > >
> > > > > > Add the devicetree file describing the currently supported features,
> > > > > > namely PMIC, UART, I2C, GPIO, SD card, QSPI Flash, eMMC and Ethernet.
> > > > > >
> > > > > > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
..
> > > > > > +
> > > > > > +&mmc1 {
> > > > > > +	disable-wp;
> > > >
> > > > Due to which difference is 'disable-wp' necessary for the Mars board and not
> > > > necessary for the VisionFive 2 board?
> > >
> > > Mars doesn't have wp pin, but dunno vf2 case since I don't have a VF2
> > > board ;)

The schematic is available here:
https://doc-en.rvspace.org/VisionFive2/PDF/RV002_V1.3B_20230208.PDF

> >
> > If the Milk-V Mars does not have a WP GPIO, we should be able to drop this
> > property. The VisionFive 2 does not need it either.
>
> Nope, dropping this property would result in RO sdcard on vf2.
> >
> > > >
> > > > > > +	cd-gpios = <&sysgpio 41 GPIO_ACTIVE_LOW>;
> > > >
> > > > On my VisionFive 2 1.2B, and 1.3A boards GPIO 41 reflects if an SD-card is
> > > > inserted (as shown in U-Boot by gpio status -a). So shouldn't this value be
> > > > moved to the common include "jh7110-visionfive2-mars-common.dtsi" and
> > > > broken-cd removed from the VisionFive2 board?
> > >
> > > I tested the CD pin and can confirm it works on Mars, but I dunno whether
> > > this works on VF2 since I have no VF2 board.
> > > Could you please check whether it works or not on VF2?
> >
> > As mentioned in my prior mail the card detect GPIO is working on the
> > VisionFive 2. StarFive acknowledged my U-Boot patch:
> >
> > https://lore.kernel.org/u-boot/SHXPR01MB086314C47C281B3DDDF7BAE9E63AA@SHXPR01MB0863.CHNPR01.prod.partner.outlook.cn/
>
> Thanks for confirmation.

Actually comparing the schematic for the VF2 above and the Mars board[1] I
don't see any differences in how the SD-card is connected, so if I'm right the
mmc1 node could be fully defined in the jh7110-common.dtsi.

[1]: https://github.com/milkv-mars/mars-files/blob/main/Mars_hardware_schematics/Mars_V1.11_20230821.pdf

/Emil

>
> >
> > Best regards
> >
> > Heinrich
> >
> > >
> > > >
> > > > https://doc-en.rvspace.org/VisionFive2/PDF/SCH_RV002_V1.2A_20221216pdf
> > > > has a line
> > > >
> > > >      GPIO41 | SD_SDIO0_CD_GPIO41 | Micro SD：J10
> > > >
> > > > Best regards
> > > >
> > > > Heinrich
> > > >
> > > > > > +};
> > > > > > --
> > > > > > 2.43.0
> > > >
> >