Re: [PATCH v4 1/2] dt-bindings: arm: qcom: Document the sc7280 CRD Pro boards

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On 12/20/2022 8:00 PM, Matthias Kaehlcke wrote:
On Tue, Dec 20, 2022 at 10:30:32AM +0530, Rajendra Nayak wrote:

On 12/16/2022 7:49 PM, Matthias Kaehlcke wrote:
On Fri, Dec 16, 2022 at 04:59:17PM +0530, Rajendra Nayak wrote:
Add compatibles for the Pro SKU of the sc7280 CRD boards
which come with a Pro variant of the qcard.
The Pro qcard variant has smps9 from pm8350c ganged up with
smps7 and smps8.

Signed-off-by: Rajendra Nayak <quic_rjendra@xxxxxxxxxxx>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
---
v4 changes:
Added the zoglin-sku1536 compatible along with hoglin-sku1536.
Zoglin is same as the Hoglin variant, with the SPI Flash reduced
from 64MB to 8MB

   Documentation/devicetree/bindings/arm/qcom.yaml | 6 ++++++
   1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/qcom.yaml b/Documentation/devicetree/bindings/arm/qcom.yaml
index 1b5ac6b02bc5..07771d4c91bd 100644
--- a/Documentation/devicetree/bindings/arm/qcom.yaml
+++ b/Documentation/devicetree/bindings/arm/qcom.yaml
@@ -558,6 +558,12 @@ properties:
             - const: google,hoglin
             - const: qcom,sc7280
+      - description: Qualcomm Technologies, Inc. sc7280 CRD Pro platform (newest rev)
+        items:
+          - const: google,zoglin-sku1536
+          - const: google,hoglin-sku1536

Is there actually such a thing as a 'hoglin-sku1536', i.e. the Pro qcard
with 64MB of SPI flash, or do they all have 8MB of flash?

The SPI flash is on the CRD mother-board and not on the qcards, so if you replace
the qcards on the CRDs with 64MB flash you would need the hoglin-sku1536 to
boot on those.

With such a configuration how does the bootloader know it should pass the kernel
the device tree for 'hoglin-sku1536' (pro) and not the non-pro variant? IIUC the
device tree is selected based on pin strappings on the mother-board, not the
qcard.

The device tree is selected based on the pin strappings _and_ additional logic
to dynamically identify modem/non-modem(wifi) as well as pro/non-pro SKUs which
was added in the bootloaders.



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