On Thu, May 6, 2021 at 10:14 PM Steven Lee [off-list ref] wrote:

The 05/07/2021 09:13, Rob Herring wrote:

quoted

On Thu, May 06, 2021 at 06:03:08PM +0800, Steven Lee wrote:

quoted

AST2600-A2 EVB has the reference design for enabling SD bus
power and toggling SD bus signal voltage by GPIO pins.

In the reference design, GPIOV0 of AST2600-A2 EVB is connected to
power load switch that providing 3.3v to SD1 bus vdd. GPIOV1 is
connected to a 1.8v and a 3.3v power load switch that providing
signal voltage to
SD1 bus.

If GPIOV0 is active high, SD1 bus is enabled. Otherwise, SD1 bus is
disabled.
If GPIOV1 is active high, 3.3v power load switch is enabled, SD1
signal voltage is 3.3v. Otherwise, 1.8v power load switch will be
enabled, SD1 signal voltage becomes 1.8v.

AST2600-A2 EVB also support toggling signal voltage for SD2 bus.
The design is the same as SD1 bus. It uses GPIOV2 as power-gpio and
GPIOV3 as power-switch-gpio.

Signed-off-by: Steven Lee <redacted>
---
 .../devicetree/bindings/mmc/aspeed,sdhci.yaml | 101 +++++++++++++++++-
 1 file changed, 97 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
index 987b287f3bff..de7e61b3d37a 100644
--- a/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml
+++ b/Documentation/devicetree/bindings/mmc/aspeed,sdhci.yaml

@@ -45,10 +45,16 @@ patternProperties:

     properties:
       compatible:
-        enum:
-          - aspeed,ast2400-sdhci
-          - aspeed,ast2500-sdhci
-          - aspeed,ast2600-sdhci
+        oneOf:
+          - items:
+              - enum:
+                  - aspeed,ast2400-sdhci
+                  - aspeed,ast2500-sdhci
+                  - aspeed,ast2600-sdhci
+          - items:
+              - enum:
+                  - aspeed,ast2600-sdhci
+              - const: sdhci

Why are you adding 'sdhci'. That's not useful as a compatible given how
many quirks different implementations have.

It is for passing the dtbs_check of the second example.
Without this definition, many device trees have the following
error:

['aspeed,ast2600-sdhci', 'sdhci'] is too long
Additional items are not allowed ('sdhci' was unexpected)

I would probably fix the dts files then. Does anything depend on 'sdhci'?

Rob

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