From: Sean Anderson <seanga2@gmail.com>
To: "Wladimir J. van der Laan" <laanwj@gmail.com>,
Carlos Eduardo de Paula <me@carlosedp.com>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>,
Anup Patel <Anup.Patel@wdc.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
"linux-riscv@lists.infradead.org"
<linux-riscv@lists.infradead.org>,
Paul Walmsley <paul.walmsley@sifive.com>
Subject: Re: [PATCH 08/10] riscv: Add Kendryte K210 device tree
Date: Wed, 19 Feb 2020 17:28:04 -0500
Message-ID: <cabd9527-3df3-4e5a-4669-5c14ed44e94d@gmail.com> (raw)
In-Reply-To: <20200219090612.7onbaoygy6waumnw@aurora.visucore.com>
On 2/19/20 4:06 AM, Wladimir J. van der Laan wrote:
> 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 :)
Ah, I didn't notice that, thanks.
>>
>> 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.
Do you have a link to that section?
--Sean
next prev parent 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
2020-02-19 22:28 ` Sean Anderson [this message]
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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