[PATCH v2] sandbox: cros-ec: Add tests for the Chrome OS PWM driver

[Simon Glass]

Hi Alpher,

On Wed, 19 May 2021 at 09:30, Alper Nebi Yasak <alpernebiyasak at gmail.com> wrote:
>
> This patch adds a limited pulse-width modulator to sandbox's Chrome OS
> Embedded Controller emulation. The emulated PWM device supports multiple
> channels but can only set a duty cycle for each, as the actual EC
> doesn't expose any functionality or information other than that. Though
> the EC supports specifying the PWM channel by its type (e.g. display
> backlight, keyboard backlight), this is not implemented in the emulation
> as nothing in U-Boot uses this type specification.
>
> This emulated PWM device is then used to test the Chrome OS PWM driver

Typically we use "Chromium OS" for open-source software.

> in sandbox. Adding the required device node to the sandbox test
> device-tree unfortunately makes it the first PWM device, so this also
> touches some other tests to make sure they still use the sandbox PWM.
>
> Signed-off-by: Alper Nebi Yasak <alpernebiyasak at gmail.com>
> ---
> This depends on a small fix [1] for cros-ec-pwm which otherwise fails to
> build.
>
> [1] https://patchwork.ozlabs.org/project/uboot/patch/20210514134840.19380-1-alpernebiyasak@gmail.com/
>
> Changes in v2:
> - Try to clarify commit message
>
> v1: https://patchwork.ozlabs.org/project/uboot/patch/20210516154144.141945-1-alpernebiyasak@gmail.com/
>
>  arch/sandbox/dts/test.dts          |  6 +++
>  arch/sandbox/include/asm/test.h    | 10 +++++
>  configs/sandbox64_defconfig        |  1 +
>  configs/sandbox_defconfig          |  1 +
>  configs/sandbox_flattree_defconfig |  1 +
>  configs/sandbox_noinst_defconfig   |  1 +
>  configs/sandbox_spl_defconfig      |  1 +
>  drivers/misc/cros_ec_sandbox.c     | 47 +++++++++++++++++++++++
>  test/cmd/pwm.c                     | 32 +++++++++++++++-
>  test/dm/Makefile                   |  1 +
>  test/dm/cros_ec_pwm.c              | 60 ++++++++++++++++++++++++++++++
>  test/dm/panel.c                    |  2 +-
>  test/dm/pwm.c                      |  6 ++-
>  13 files changed, 164 insertions(+), 5 deletions(-)
>  create mode 100644 test/dm/cros_ec_pwm.c

Reviewed-by: Simon Glass <sjg at chromium.org>