stm32h7: Add stm32h7_adc_enable_tsense()

Author: andoma

src/platform/stm32h7/stm32h7_adc.c

@@ -105,6 +105,10 @@ stm32h7_adc_init(uint32_t base, uint32_t pcsel, uint32_t difsel)
 	 reg_rd(base + ADC3_CALFACT));
 }
 
+void stm32h7_adc_enable_tsense(void)
+{
+  reg_set_bit(ADC3_BASE + ADC3_CCR, 23);
+}
 
 void
 stm32h7_adc_set_smpr(uint32_t base, uint32_t channel, uint32_t value)

src/platform/stm32h7/stm32h7_adc.h

@@ -48,6 +48,7 @@
 
 #define ADC3_DIFSEL   0xb0
 #define ADC3_CALFACT  0xb4
+#define ADC3_CCR      0x308
 
 #define ADCX_CSR      0x40022300
 #define ADCX_CCR      0x40022308
@@ -56,6 +57,8 @@
 
 void stm32h7_adc_init(uint32_t base, uint32_t pcsel, uint32_t difsel);
 
+void stm32h7_adc_enable_tsense(void);
+
 void stm32h7_adc_set_smpr(uint32_t base, uint32_t channel, uint32_t value);
 
 void stm32h7_set_seq_channel(uint32_t base, uint32_t seq, uint32_t channel);