This patch adds a limited pulse-width modulator to sandbox's Chromium 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 Chromium OS PWM driver 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 <alpernebiya...@gmail.com> Reviewed-by: Simon Glass <s...@chromium.org> --- 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-alpernebiya...@gmail.com/ Changes in v3: - Add tag: "Reviewed-by: Simon Glass <s...@chromium.org>" - Replace instances of "Chrome OS" with "Chromium OS" in commit message - Add missing "EC" in the subject line v2: https://patchwork.ozlabs.org/project/uboot/patch/20210519153017.12544-1-alpernebiya...@gmail.com/ Changes in v2: - Try to clarify commit message v1: https://patchwork.ozlabs.org/project/uboot/patch/20210516154144.141945-1-alpernebiya...@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 Applied to u-boot-dm/next, thanks!
