drivers: serial: stm32: expand DMAT errata test.

I manually checked the errata sheets for all STM32Hxx/STM32Uxx parts to
confirm the defect's presence or absence. It appears to have been resolved
in silicon on newer parts (e.g., STM32U3xx family), so hopefully this test
will not need grow further (knock on wood).

Co-authored-by: Nicolas Zuluaga <[email protected]>
Signed-off-by: Samuel Coleman <[email protected]>

Author: 2 people

drivers/serial/Kconfig.stm32

@@ -25,18 +25,30 @@ config UART_STM32
 
 if UART_STM32
 
-if SOC_STM32U575XX || SOC_STM32U585XX || \
-		   SOC_STM32H562XX || SOC_STM32H563XX || SOC_STM32H573XX
+config UART_STM32U5_ERRATA_DMAT_AFFECTED
+	bool
+	default y
+	depends on SOC_STM32H503XX || \
+		SOC_STM32H523XX || SOC_STM32H533XX || \
+		SOC_STM32H562XX || SOC_STM32H563XX || SOC_STM32H573XX || \
+		SOC_STM32U575XX || SOC_STM32U585XX
+	help
+	  Affected by the DMAT errata. See UART_STM32U5_ERRATA_DMAT.
+
+if UART_STM32U5_ERRATA_DMAT_AFFECTED
 
 choice UART_STM32U5_ERRATA_DMAT
 	prompt "Workaround for DMAT errata on selected devices"
 	default UART_STM32U5_ERRATA_DMAT_LOWPOWER if PM
 	default UART_STM32U5_ERRATA_DMAT_NOCLEAR if !PM
 	help
 	  Handles erratum "USART does not generate DMA requests after
-	  setting/clearing DMAT bit".
-	  Seen in Errata Sheet 0499 § 2.19.2 and §2.20.1 for stm32u57x/u58x,
-	          Errata Sheet 0565 § 2.14.1 and §2.15.1 for stm32h56x/h57x
+	  setting/clearing DMAT bit" as described in the errata sheets:
+
+	  - STM32H503xx: ES0561 rev. 4, sections 2.11.2 and 2.12.1
+	  - STM32H523xx/H533xx: ES0621 rev. 2, sections 2.14.2 and 2.15.1
+	  - STM32H562xx/H563xx/H573xx: ES0565 rev. 7, sections 2.16.2 and 2.17.1
+	  - STM32U575xx/U585xx: ES0499 rev. 10, sections 2.21.2 and 2.22.1
 
 config UART_STM32U5_ERRATA_DMAT_LOWPOWER
 	bool "Send first byte by polling"
@@ -51,8 +63,8 @@ config UART_STM32U5_ERRATA_DMAT_NOCLEAR
 	  This option keeps DMAT bit set. This may cause additional power
 	  consumption in STOP low-power modes.
 
-endchoice
+endchoice # UART_STM32U5_ERRATA_DMAT
 
-endif # U575 || U585 || H562 || H563 || H573
+endif # UART_STM32U5_ERRATA_DMAT_AFFECTED
 
 endif # UART_STM32