Hi Alpher,
On Wed, 19 May 2021 at 09:30, Alper Nebi Yasak alpernebiyasak@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@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-alpe...
Changes in v2:
- Try to clarify commit message
v1: https://patchwork.ozlabs.org/project/uboot/patch/20210516154144.141945-1-alp...
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@chromium.org