[PATCH 0/6] [Disco SRU] Use gpiolib for chipselect in DW SPI driver

[Kleber Souza]

On 5/6/19 11:19 AM, Ike Panhc wrote:
> BugLink: https://bugs.launchpad.net/bugs/1826142
> 
> Current spi-dw-mmio driver needs hardware description from devicetree
> or acpitables for chipselect but only support devicetree. Here are
> patches to enable ACPI support for DW SPI driver so that the TPM
> module can be supported on ACPI machines.
> 
> The first patch for spi core provides new method to set gpio pin with
> gpiolib if use_gpio_descriptors=true and legacy method is still
> available if use_gpio_descriptors=false.
> 
> The 2nd patch is to switch DW SPI driver to use gpiolib for
> chipselect so the duplicate devicetree code can be removed.
> 
> The rest of patches are minor regression fixes collected from 
> mainline about unused variable and default polarity of gpio pin.
> 
> 
> Anders Roxell (1):
>   spi: dw: fix warning unused variable 'ret'
> 
> Linus Walleij (5):
>   spi: Optionally use GPIO descriptors for CS GPIOs
>   spi: dw: Convert to use CS GPIO descriptors
>   spi: Support high CS when using descriptors
>   spi: dw: Fix default polarity of native chipselect
>   gpio: of: Fix logic inversion
> 
>  drivers/gpio/gpiolib-of.c |   2 +-
>  drivers/spi/spi-dw-mmio.c |  22 --------
>  drivers/spi/spi-dw.c      |  15 ++----
>  drivers/spi/spi.c         | 109 ++++++++++++++++++++++++++++++++++----
>  include/linux/spi/spi.h   |  23 ++++++--
>  5 files changed, 122 insertions(+), 49 deletions(-)
> 

Hi Ike,

There is another commit upstream that states to fix f3186dd876697e69
("spi: Optionally use GPIO descriptors for CS GPIOs"):

commit 1723fdec5fcbc4de3d26bbb23a9e1704ee258955
Author: Geert Uytterhoeven <geert+renesas at glider.be>
Date:   Wed Apr 3 16:46:56 2019 +0200
    spi: Add missing error handling for CS GPIOs

Is this commit needed as well?


Thanks,
Kleber