Convert various legacy .txt bindings for Microchip (formerly Atmel) AT91/SAMA
family system peripherals to proper YAML schemas. This includes:

- CHIPID (SoC ID register block)
- PIT (Period Interval Timer, old style)
- PIT64B (64-bit Period Interval Timer, newer parts)
- ST (System Timer, including watchdog subnode)
- RAMC/SDRAMC/DDRAMC/UDDRC (SDRAM/DDR memory controller

Signed-off-by: Akhila YS <redacted>
---
Changes in v4:
- atmel,at91rm9200-sdramc: remove "- items enum:" and replace it with "- enum:" for compatible property.
- Link to v3: https://lore.kernel.org/r/20260226-arm-microchip-v3-0-0bda15abd922@gmail.com (local)

Changes in v3:
- Change email for maintainers.
- atmel,at91rm9200-st: redefine watchdog node as a pattern property.
- Remove corresponding binding node from txt document for every yaml patch. 
- Link to v2: https://lore.kernel.org/r/20260224-arm-microchip-v2-0-8bedacd2cdcb@gmail.com (local)

Changes in v2:
- Change email for maintainers.
- microchip,sam9x60-pit64b: modify compatible and clock-names in properties.  
- Link to v1: https://lore.kernel.org/r/20260217-arm-microchip-v1-0-ae5d907e10e3@gmail.com (local)

---
Akhila YS (5):
      dt-bindings: arm: microchip,sama7g5-chipid : convert to DT schema
      dt-bindings: arm: atmel,at91sam9260-pit: convert to DT schema
      dt-bindings: arm: microchip,sam9x60-pit64b : convert to DT schema
      dt-bindings: arm: atmel,at91rm9200-st: convert to DT schema
      dt-bindings: arm: atmel,at91rm9200-sdramc: convert to DT schema

 .../bindings/arm/atmel,at91rm9200-sdramc.yaml      | 66 +++++++++++++++++++++
 .../bindings/arm/atmel,at91rm9200-st.yaml          | 69 ++++++++++++++++++++++
 .../bindings/arm/atmel,at91sam9260-pit.yaml        | 49 +++++++++++++++
 .../devicetree/bindings/arm/atmel-sysregs.txt      | 48 ---------------
 .../bindings/arm/microchip,sam9x60-pit64b.yaml     | 68 +++++++++++++++++++++
 .../bindings/arm/microchip,sama7g5-chipid.yaml     | 41 +++++++++++++
 6 files changed, 293 insertions(+), 48 deletions(-)
---
base-commit: ca3a02fda4da8e2c1cb6baee5d72352e9e2cfaea
change-id: 20260128-arm-microchip-c0c0515024e6

Best regards,
-- 
Akhila YS [off-list ref]