dt-bindings: mmc: st,sdhci: Convert to DT schema

Convert STMicroelectronics sdhci-st MMC/SD controller binding from
text format to YAML DT schema.
Changes during conversion:
- Preserve optional 'icn' clock and 'top-mmc-delay' register region
  via minItems: 1 on their respective properties.
- Conditionally require reg-names when two reg entries are present
  via an allOf if/then block, preventing silent runtime failure in
  devm_platform_ioremap_resource_byname().
- Constrain max-frequency to enum [200000000, 100000000, 50000000]
  with a default of 50000000, matching the driver's behaviour in
  sdhci-st.c.

Signed-off-by: Charan Pedumuru <charan.pedumuru@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>

0 files changed, 0 insertions, 0 deletions