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From: "Wladimir J. van der Laan" <laanwj@gmail.com>
To: Carlos Eduardo de Paula <me@carlosedp.com>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
	Anup Patel <Anup.Patel@wdc.com>,
	Sean Anderson <seanga2@gmail.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	"linux-riscv@lists.infradead.org"
	<linux-riscv@lists.infradead.org>
Subject: Re: [PATCH 08/10] riscv: Add Kendryte K210 device tree
Date: Wed, 19 Feb 2020 10:06:12 +0100
Message-ID: <20200219090612.7onbaoygy6waumnw@aurora.visucore.com> (raw)
In-Reply-To: <CADnnUqenadntSrngNGjnu40inxZWK1Nm3T64BnyY114hEwC_Og@mail.gmail.com>

On Tue, Feb 18, 2020 at 04:26:17PM -0300, Carlos Eduardo de Paula wrote:
> On Tue, Feb 18, 2020 at 2:48 PM Sean Anderson <seanga2@gmail.com> wrote:
> >
> > So the LCD connector is supposed to be for a ST7789V controller, but
> > there doesn't appear to be a driver in Linux for it. I don't have an
> > appropriate LCD screen, so I will not be able to write a driver.
> >
> 
> Actually there is a driver and config DRM_PANEL_SITRONIX_ST7789V, in
> gpu/drm/panel/panel-sitronix-st7789v.c and also FB_TFT_ST7789V and
> CONFIG_FB_TFT_ST7789V with the driver a in
> staging/fbtft/fb_st7789v.c. Might be easier :)
> 
> Weird that the Kendryte SDK refers to the LCD as NT35310
> (https://github.com/kendryte/kendryte-standalone-demo/tree/develop/lcd).

I remember checking the datasheet for both a while ago and NT35310 and ST7789V
seem to be more or less compatible, with only register differences
for more obscure functionality.

The more involved part is likely to adapt the spi-dw driver, apart from making the
ctrlr0 shifts configurable, there's the "OCTAL" mode that is used and extra
register that isn't set in the Linux driver (spi_ctrlr0 / 0xf4) concerning
"instruction address translation mode" and other things that needs to
be set correctly for LCD transfers to work.

> > There is no need for GPIOs. The datasheet shows SPI0 as hooked up to the
> > SD card, but the default pinconf doesn't have it hooked up. In addition,
> > the dedicated SPI0 data lines are already connected to the LCD. For

Yes - apparently only if you set sysctl spi_dvp_data_enable to route the
SPI0_0-7 pins to to the LCD data pins (bypassing FPIOA).

BTW speaking of which, does anyone know what's up with the K210's DMA
controller? It looks like it can only transfer 32-bit values from and to
peripherals? At least the kendryte-standalone-sdk goes to great lengths to
first allocate a 32-bit buffer then manually copy it to say, bytes or 16-bit
words. Seems quite a silly workaround with a lot of overhead.

Wladimir



  reply index

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-12 10:34 [PATCH 00/10] Kendryte k210 SoC boards support Damien Le Moal
2020-02-12 10:34 ` [PATCH 01/10] riscv: Fix gitignore Damien Le Moal
2020-02-20  0:15   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 02/10] riscv: Force flat memory model with no-mmu Damien Le Moal
2020-02-14 20:18   ` Sean Anderson
2020-02-15  2:15     ` Damien Le Moal
2020-02-15  2:26       ` Sean Anderson
2020-02-15  2:40         ` Damien Le Moal
2020-03-02  3:48   ` Anup Patel
2020-03-04 18:38   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 03/10] riscv: Unaligned load/store handling for M_MODE Damien Le Moal
2020-03-02  3:57   ` Anup Patel
2020-03-04 19:28   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 04/10] riscv: Add BUILTIN_DTB support Damien Le Moal
2020-03-02  3:58   ` Anup Patel
2020-03-04 19:28   ` Palmer Dabbelt
2020-03-05  4:58     ` Anup Patel
2020-03-05  5:14       ` Damien Le Moal
2020-03-05  5:37         ` Anup Patel
2020-03-05  6:13           ` Damien Le Moal
2020-03-08  6:10             ` Anup Patel
2020-03-05  8:18         ` Atish Patra
2020-03-07  0:02           ` Sean Anderson
2020-03-07  1:51             ` Atish Patra
2020-03-07  2:08               ` Sean Anderson
2020-03-06 23:56         ` Sean Anderson
2020-02-12 10:34 ` [PATCH 05/10] riscv: Add SOC early init support Damien Le Moal
2020-03-04 19:28   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 06/10] riscv: Add Kendryte K210 SoC support Damien Le Moal
2020-02-14 20:31   ` Sean Anderson
2020-03-04 19:38   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 07/10] riscv: Select required drivers for Kendryte SOC Damien Le Moal
2020-03-02  3:59   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 08/10] riscv: Add Kendryte K210 device tree Damien Le Moal
2020-02-14 20:51   ` Sean Anderson
2020-02-15  2:34     ` Damien Le Moal
2020-02-15  2:48       ` Sean Anderson
2020-02-15  3:00         ` Damien Le Moal
2020-02-18 14:12           ` Carlos Eduardo de Paula
2020-02-18 14:18             ` Sean Anderson
2020-02-18 14:30               ` Carlos Eduardo de Paula
2020-02-18 17:48                 ` Sean Anderson
2020-02-18 19:26                   ` Carlos Eduardo de Paula
2020-02-19  9:06                     ` Wladimir J. van der Laan [this message]
2020-02-19 22:28                       ` Sean Anderson
2020-02-20 10:48                         ` Wladimir J. van der Laan
2020-02-22 19:07                       ` Wladimir J. van der Laan
2020-04-01 17:55                         ` Drew Fustini
2020-04-02  2:24                           ` Damien Le Moal
2020-02-19  8:50                   ` Wladimir J. van der Laan
2020-02-27 19:43       ` Sean Anderson
2020-03-02  4:06   ` Anup Patel
2020-03-02  4:15     ` Damien Le Moal
2020-03-02  4:22       ` Anup Patel
2020-03-02  4:51         ` Damien Le Moal
2020-03-02  5:05           ` Anup Patel
2020-03-02  5:08             ` Damien Le Moal
2020-03-07  0:18               ` Sean Anderson
2020-03-07  4:11                 ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 09/10] riscv: Kendryte K210 default config Damien Le Moal
2020-03-02  4:07   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-12 10:34 ` [PATCH 10/10] riscv: create a loader.bin for the kendryte kflash.py tool Damien Le Moal
2020-03-02  4:08   ` Anup Patel
2020-03-04 19:44   ` Palmer Dabbelt
2020-02-14 15:05 ` [PATCH 00/10] Kendryte k210 SoC boards support Carlos Eduardo de Paula
2020-02-15  2:02   ` Damien Le Moal
2020-02-17 13:28     ` Carlos Eduardo de Paula
2020-02-26 21:31       ` Carlos Eduardo de Paula
2020-02-27  2:18         ` Damien Le Moal
2020-02-28 20:32 ` Sean Anderson
2020-03-02  3:01   ` Damien Le Moal
2020-03-02  3:53     ` Sean Anderson
2020-03-02  4:11       ` Damien Le Moal
2020-03-02  4:18         ` Sean Anderson
2020-03-02  4:54           ` Damien Le Moal
2020-03-02  4:56             ` Sean Anderson
2020-03-02  5:03               ` Damien Le Moal
2020-03-02  4:17       ` Anup Patel
2020-03-02  4:21         ` Sean Anderson
2020-03-02  4:48         ` Damien Le Moal
2020-03-02  4:51           ` Damien Le Moal
2020-03-02  5:02           ` Sean Anderson
2020-03-02  5:11             ` Damien Le Moal
2020-03-02  5:25               ` Sean Anderson
2020-03-02  5:43                 ` Damien Le Moal
2020-03-04 19:44 ` Palmer Dabbelt

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