mbox series

[0/8] video: support Rocktech RK050HR345-CT106A panel

Message ID 20260219175130.2839234-1-dario.binacchi@amarulasolutions.com
Headers
Series video: support Rocktech RK050HR345-CT106A panel |

Message

Dario Binacchi Feb. 19, 2026, 5:51 p.m. UTC 
This series adds support for the Rocktech RK050HR345-CT106A panel.
The initialization of this panel requires a 9-bit word length
configuration. To support this, I have extended the STM32 SPI driver
(including support for the STM32MP25 SoC) to implement the set_wordlen
operation.

To properly validate these changes and ensure the SPI uclass correctly
handles the word length propagation, I have also implemented the
corresponding logic in the sandbox driver and added a dedicated unit
test.

I have grouped these patches together to provide a complete overview of
the implementation and its verification.


Dario Binacchi (8):
  spi: add support for bits-per-word setting
  spi: sandbox_spi: support wordlen setup
  test: spi: add sandbox_spi_get_wordlen interface
  test: dm: spi: add testcase for spi_set_wordlen()
  spi: stm32: clean up buffer length assignment
  spi: stm32: add support for bits-per-word setting
  spi: stm32: extend support to STM32MP25
  video: support Rocktech RK050HR345-CT106A panel

 arch/sandbox/include/asm/test.h |   8 +
 drivers/spi/sandbox_spi.c       |  21 ++
 drivers/spi/spi-uclass.c        |  19 ++
 drivers/spi/stm32_spi.c         |  67 +++++-
 drivers/video/Kconfig           |   8 +
 drivers/video/Makefile          |   1 +
 drivers/video/ilitek-ili9806e.c | 354 ++++++++++++++++++++++++++++++++
 include/spi.h                   |  12 ++
 test/dm/spi.c                   |  16 ++
 9 files changed, 499 insertions(+), 7 deletions(-)
 create mode 100644 drivers/video/ilitek-ili9806e.c

Comments

Svyatoslav Ryhel Feb. 19, 2026, 6:43 p.m. UTC | #1 
чт, 19 лют. 2026 р. о 19:51 Dario Binacchi
<dario.binacchi@amarulasolutions.com> пише:
>
> This series adds support for the Rocktech RK050HR345-CT106A panel.
> The initialization of this panel requires a 9-bit word length
> configuration. To support this, I have extended the STM32 SPI driver
> (including support for the STM32MP25 SoC) to implement the set_wordlen
> operation.
>
> To properly validate these changes and ensure the SPI uclass correctly
> handles the word length propagation, I have also implemented the
> corresponding logic in the sandbox driver and added a dedicated unit
> test.
>
> I have grouped these patches together to provide a complete overview of
> the implementation and its verification.
>
>
> Dario Binacchi (8):
>   spi: add support for bits-per-word setting
>   spi: sandbox_spi: support wordlen setup
>   test: spi: add sandbox_spi_get_wordlen interface
>   test: dm: spi: add testcase for spi_set_wordlen()

Hello Dario!

You should not need to modify spi framework to support 9 bit len xfer.
dm_spi_xfer supports this already, you need only stm32 support for
non-aligned xfers.

You can refer to ssd2825 bridge as an example of 9-bit spi
communication for write and 16 bit reads.

>   spi: stm32: clean up buffer length assignment
>   spi: stm32: add support for bits-per-word setting
>   spi: stm32: extend support to STM32MP25
>   video: support Rocktech RK050HR345-CT106A panel
>
>  arch/sandbox/include/asm/test.h |   8 +
>  drivers/spi/sandbox_spi.c       |  21 ++
>  drivers/spi/spi-uclass.c        |  19 ++
>  drivers/spi/stm32_spi.c         |  67 +++++-
>  drivers/video/Kconfig           |   8 +
>  drivers/video/Makefile          |   1 +
>  drivers/video/ilitek-ili9806e.c | 354 ++++++++++++++++++++++++++++++++
>  include/spi.h                   |  12 ++
>  test/dm/spi.c                   |  16 ++
>  9 files changed, 499 insertions(+), 7 deletions(-)
>  create mode 100644 drivers/video/ilitek-ili9806e.c
>
> --
> 2.43.0
>
> base-commit: 7dca54ef4c44c82bdc6716ac6cdc84c22c66e9ed
> branch: RK050HR345-CT106A-ON-SPI

To unsubscribe from this group and stop receiving emails from it, send an email to linux-amarula+unsubscribe@amarulasolutions.com.
Dario Binacchi Feb. 21, 2026, 9:41 a.m. UTC | #2 
Hello Svyatoslav,

On Thu, Feb 19, 2026 at 7:44 PM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
>
> чт, 19 лют. 2026 р. о 19:51 Dario Binacchi
> <dario.binacchi@amarulasolutions.com> пише:
> >
> > This series adds support for the Rocktech RK050HR345-CT106A panel.
> > The initialization of this panel requires a 9-bit word length
> > configuration. To support this, I have extended the STM32 SPI driver
> > (including support for the STM32MP25 SoC) to implement the set_wordlen
> > operation.
> >
> > To properly validate these changes and ensure the SPI uclass correctly
> > handles the word length propagation, I have also implemented the
> > corresponding logic in the sandbox driver and added a dedicated unit
> > test.
> >
> > I have grouped these patches together to provide a complete overview of
> > the implementation and its verification.
> >
> >
> > Dario Binacchi (8):
> >   spi: add support for bits-per-word setting
> >   spi: sandbox_spi: support wordlen setup
> >   test: spi: add sandbox_spi_get_wordlen interface
> >   test: dm: spi: add testcase for spi_set_wordlen()
>
> Hello Dario!
>
> You should not need to modify spi framework to support 9 bit len xfer.
> dm_spi_xfer supports this already, you need only stm32 support for
> non-aligned xfers.

Thank you for the feedback.

I initially explored the approach you suggested. However, following
the STM32 driver
implementation in the Linux kernel, I found that explicitly managing
the bits-per-word
parameter was necessary.

In the current STM32MP2 driver, the word length is effectively
hardcoded to 8 bits. To
address this, I needed to implement the set_wordlen ops, which is
already declared
among the available SPI framework ops but had not yet been implemented or used.

The proof of this approach is that the driver now correctly handles
multi-word 16-bit
transfers of any buffer size, using 9-bit words as required. This is a
significant improvement
over the common implementations that often only support single 16-bit
data transfers.
I believe this provides the necessary flexibility that dm_spi_xfer
alone couldn't achieve
without a way to redefine the word boundaries.

Thanks and regards,
Dario
>
> You can refer to ssd2825 bridge as an example of 9-bit spi
> communication for write and 16 bit reads.
>
> >   spi: stm32: clean up buffer length assignment
> >   spi: stm32: add support for bits-per-word setting
> >   spi: stm32: extend support to STM32MP25
> >   video: support Rocktech RK050HR345-CT106A panel
> >
> >  arch/sandbox/include/asm/test.h |   8 +
> >  drivers/spi/sandbox_spi.c       |  21 ++
> >  drivers/spi/spi-uclass.c        |  19 ++
> >  drivers/spi/stm32_spi.c         |  67 +++++-
> >  drivers/video/Kconfig           |   8 +
> >  drivers/video/Makefile          |   1 +
> >  drivers/video/ilitek-ili9806e.c | 354 ++++++++++++++++++++++++++++++++
> >  include/spi.h                   |  12 ++
> >  test/dm/spi.c                   |  16 ++
> >  9 files changed, 499 insertions(+), 7 deletions(-)
> >  create mode 100644 drivers/video/ilitek-ili9806e.c
> >
> > --
> > 2.43.0
> >
> > base-commit: 7dca54ef4c44c82bdc6716ac6cdc84c22c66e9ed
> > branch: RK050HR345-CT106A-ON-SPI