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Repurpose config->pwm to mean the particular PWM device (we use PWM1 on nyan), and add code to program the PWM device. BUG=none TEST=emerge-nyan chromeos-coreboot-nyan, regenerate bootimage, and boot. See that the backlight comes up in the bootloader, and brightness can be adjusted via pwm_bl driver in the kernel. Original-Change-Id: I2db047e5ef23c0e8fb66dd05ad6339d60918d493 Original-Signed-off-by: Andrew Chew <achew@nvidia.com> Original-Reviewed-on: https://chromium-review.googlesource.com/185772 Original-Reviewed-by: Andrew Bresticker <abrestic@chromium.org> (cherry picked from commit 0dee98dd0c8510ecd630b5c6cb9ea49724dc8b55) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: Ie53610f3afa30b2d8f484685fb0e8c0b12cd8241 Reviewed-on: http://review.coreboot.org/7402 Tested-by: build bot (Jenkins) Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>