Fix up WS2812 SPI driver on F072. (qmk#13022)

Author: tzarc

docs/ws2812_driver.md

@@ -72,7 +72,9 @@ WS2812_DRIVER = spi
 Configure the hardware via your config.h:
 ```c
 #define WS2812_SPI SPID1 // default: SPID1
-#define WS2812_SPI_MOSI_PAL_MODE 5 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 5
+#define WS2812_SPI_MOSI_PAL_MODE 5 // MOSI pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 5
+#define WS2812_SPI_SCK_PIN B3 // Required for F072, may be for others -- SCK pin, see the respective datasheet for the appropriate values for your MCU. default: unspecified
+#define WS2812_SPI_SCK_PAL_MODE 5 // SCK pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 5
 ```
 
 You must also turn on the SPI feature in your halconf.h and mcuconf.h
@@ -100,11 +102,11 @@ Only divisors of 2, 4, 8, 16, 32, 64, 128 and 256 are supported by hardware.
 
 While not an exhaustive list, the following table provides the scenarios that have been partially validated:
 
-| | SPI1 | SPI2 | SPI3 |
-|-|-|-|-|
-| f072 | ? | B15 :heavy_check_mark: | N/A |
-| f103 | A7 :heavy_check_mark: | B15 :heavy_check_mark: | N/A |
-| f303 | A7 :heavy_check_mark: B5 :heavy_check_mark:  | B15 :heavy_check_mark: | B5 :heavy_check_mark: |
+|      | SPI1                                        | SPI2                                    | SPI3                  |
+|------|---------------------------------------------|-----------------------------------------|-----------------------|
+| f072 | ?                                           | B15 :heavy_check_mark: (needs SCK: B13) | N/A                   |
+| f103 | A7 :heavy_check_mark:                       | B15 :heavy_check_mark:                  | N/A                   |
+| f303 | A7 :heavy_check_mark: B5 :heavy_check_mark: | B15 :heavy_check_mark:                  | B5 :heavy_check_mark: |
 
 *Other supported ChibiOS boards and/or pins may function, it will be highly chip and configuration dependent.*
 

drivers/chibios/ws2812_spi.c

@@ -16,19 +16,23 @@
 #    define WS2812_SPI_MOSI_PAL_MODE 5
 #endif
 
+#ifndef WS2812_SPI_SCK_PAL_MODE
+#    define WS2812_SPI_SCK_PAL_MODE 5
+#endif
+
 // Push Pull or Open Drain Configuration
 // Default Push Pull
 #ifndef WS2812_EXTERNAL_PULLUP
 #    if defined(USE_GPIOV1)
-#        define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+#        define WS2812_MOSI_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
 #    else
-#        define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
+#        define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
 #    endif
 #else
 #    if defined(USE_GPIOV1)
-#        define WS2812_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
+#        define WS2812_MOSI_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_OPENDRAIN
 #    else
-#        define WS2812_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN
+#        define WS2812_MOSI_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_MOSI_PAL_MODE) | PAL_STM32_OTYPE_OPENDRAIN
 #    endif
 #endif
 
@@ -63,6 +67,12 @@
 #    define WS2812_SPI_BUFFER_MODE 0  // normal buffer
 #endif
 
+#if defined(USE_GPIOV1)
+#    define WS2812_SCK_OUTPUT_MODE PAL_MODE_STM32_ALTERNATE_PUSHPULL
+#else
+#    define WS2812_SCK_OUTPUT_MODE PAL_MODE_ALTERNATE(WS2812_SPI_SCK_PAL_MODE) | PAL_STM32_OTYPE_PUSHPULL
+#endif
+
 #define BYTES_FOR_LED_BYTE 4
 #define NB_COLORS 3
 #define BYTES_FOR_LED (BYTES_FOR_LED_BYTE * NB_COLORS)
@@ -109,7 +119,11 @@ static void set_led_color_rgb(LED_TYPE color, int pos) {
 }
 
 void ws2812_init(void) {
-    palSetLineMode(RGB_DI_PIN, WS2812_OUTPUT_MODE);
+    palSetLineMode(RGB_DI_PIN, WS2812_MOSI_OUTPUT_MODE);
+
+#ifdef WS2812_SPI_SCK_PIN
+    palSetLineMode(WS2812_SPI_SCK_PIN, WS2812_SCK_OUTPUT_MODE);
+#endif  // WS2812_SPI_SCK_PIN
 
     // TODO: more dynamic baudrate
     static const SPIConfig spicfg = {WS2812_SPI_BUFFER_MODE, NULL, PAL_PORT(RGB_DI_PIN), PAL_PAD(RGB_DI_PIN), WS2812_SPI_DIVISOR};