stm32f7: enable existing ltdc

This uses the existing f4 code as a new shared common base code.

lib/stm32/common/ltdc_common_f47.c

@@ -1,8 +1,6 @@
-/** @defgroup ltdc_file LTDC
+/** @defgroup ltdc_file LTDC peripheral API
  *
- * @ingroup STM32F4xx
- *
- * @brief <b>libopencm3 STM32F4xx LTDC</b>
+ * @ingroup peripheral_apis
  *
  * @version 1.0.0
  *
@@ -11,12 +9,8 @@
  *
  * @date 5 December 2014
  *
- * This library supports the LCD controller (LTDC) in the STM32F4
- * series of ARM Cortex Microcontrollers by ST Microelectronics.
- *
- * For the STM32F4xx, LTDC is described in LCD-TFT Controller (LTDC)
- * section 16 of the STM32F4xx Reference Manual (RM0090,Rev8).
- *
+ * This library supports the LCD controller (LTDC) in the STM32F4xx and
+ * STM32F7xx series of ARM Cortex Microcontrollers by ST Microelectronics.
  *
  * LGPL License Terms @ref lgpl_license
  */
@@ -40,7 +34,9 @@
  * along with this library.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <libopencm3/stm32/f4/ltdc.h>
+/**@{*/
+
+#include <libopencm3/stm32/common/ltdc_common_f47.h>
 
 void ltdc_set_tft_sync_timings(uint16_t sync_width,    uint16_t sync_height,
 			       uint16_t h_back_porch,  uint16_t v_back_porch,
@@ -87,3 +83,5 @@ void ltdc_setup_windowing(uint8_t  layer_number,
 				     (v_back_porch << 0);
 }
 
+/**@}*/
+

lib/stm32/f4/Makefile

@@ -54,7 +54,7 @@ OBJS		+= gpio_common_all.o gpio_common_f0234.o gpio.o
 OBJS		+= hash_common_f24.o
 OBJS		+= i2c_common_v1.o
 OBJS		+= iwdg_common_all.o
-OBJS		+= ltdc.o 
+OBJS		+= ltdc_common_f47.o
 OBJS		+= pwr_common_v1.o pwr.o
 OBJS		+= rcc_common_all.o rcc.o
 OBJS		+= rng_common_v1.o

lib/stm32/f7/Makefile

@@ -54,6 +54,7 @@ OBJS		+= fmc_common_f47.o
 OBJS		+= gpio.o gpio_common_all.o gpio_common_f0234.o
 OBJS		+= i2c_common_v2.o
 OBJS		+= iwdg_common_all.o
+OBJS		+= ltdc_common_f47.o 
 OBJS		+= pwr.o rcc.o
 OBJS		+= rcc_common_all.o
 OBJS		+= rng_common_v1.o