Re: [PATCH v5 5/6] dt-bindings: spi: Convert cadence-quadspi.txt to cadence-quadspi.yaml

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Hi,

On 5/11/2020 3:14 pm, Linus Walleij wrote:
On Thu, Oct 29, 2020 at 8:39 AM Ramuthevar,Vadivel MuruganX
<vadivel.muruganx.ramuthevar@xxxxxxxxxxxxxxx> wrote:

From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@xxxxxxxxxxxxxxx>

Convert the cadence-quadspi.txt documentation to cadence-quadspi.yaml
remove the cadence-quadspi.txt from Documentation/devicetree/bindings/spi/

Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@xxxxxxxxxxxxxxx>

+  cdns,is-decoded-cs:
+    type: boolean
+    description:
+      Flag to indicate whether decoder is used or not.

Please elaborate a bit on what kind of decoder this is.
I am curious! :)
Sure, I will elaborate more about decoder for chip select.

QSPI controller has in-built chip select decoder instead of external decder circuit, it supports multiple chip selection by 2-to-4 decoder, the below combinations
CS0 - 1110
CS1 - 1101
CS2 - 1011
CS3 - 0111

when in direct access mode, each chip selection has it's own specified memory region as well.

Regards
Vadivel

Yours,
Linus Walleij




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