hammer: Add staff board

hammer corresponds to poppy, and staff corresponds to soraka.

Current differences (hammer/staff):
 - USB id (5022/502b)
 - PWM frequency (10kHz/100Hz):
   - On staff, driving PWM at 10kHz leads to an actual duty cycle
     around 30-40%, with a PWM output at 1% (long rise/fall time).
     100Hz looks better, we get ~1.45% duty with 1% PWM output.

BRANCH=none
BUG=b:38277869
TEST=Flash staff, boots fine.
TEST=pwm 0 1 shows quite dim backlight on staff.

Change-Id: I66ba2adf89fbee8578ee473afb28e3e242b4d111
Reviewed-on: https://chromium-review.googlesource.com/505855
Commit-Ready: Nicolas Boichat <drinkcat@chromium.org>
Tested-by: Nicolas Boichat <drinkcat@chromium.org>
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>

board/hammer/board.c

@@ -54,9 +54,15 @@ const struct i2c_port_t i2c_ports[] = {
 };
 const unsigned int i2c_ports_used = ARRAY_SIZE(i2c_ports);
 
+#ifdef BOARD_STAFF
+#define KBLIGHT_PWM_FREQ 100 /* Hz */
+#else
+#define KBLIGHT_PWM_FREQ 10000 /* Hz */
+#endif
+
 /* PWM channels. Must be in the exactly same order as in enum pwm_channel. */
 const struct pwm_t pwm_channels[] = {
-	{STM32_TIM(TIM_KBLIGHT), STM32_TIM_CH(1), 0, 10000 /* Hz */ },
+	{STM32_TIM(TIM_KBLIGHT), STM32_TIM_CH(1), 0, KBLIGHT_PWM_FREQ},
 };
 BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT);
 

board/hammer/board.h

@@ -77,7 +77,13 @@
 
 /* USB Configuration */
 #define CONFIG_USB
+#ifdef BOARD_STAFF
+#define CONFIG_USB_PID 0x502b
+#elif defined(BOARD_HAMMER)
 #define CONFIG_USB_PID 0x5022
+#else
+#error "Invalid board"
+#endif
 #define CONFIG_STREAM_USB
 #define CONFIG_USB_UPDATE
 

board/staff

@@ -0,0 +1 @@
+hammer

util/flash_ec

@@ -74,6 +74,7 @@ BOARDS_STM32=(
 	ryu
 	samus_pd
 	snoball
+	staff
 	strago_pd
 	zinger
 )