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[1/3] dt: spi: Add Renesas RZ/N1 binding documentation

Message ID 1568376720-7402-2-git-send-email-gareth.williams.jx@renesas.com (mailing list archive)
State Superseded
Headers show
Series spi: dw: Add basic runtime PM support | expand

Commit Message

Gareth Williams Sept. 13, 2019, 12:11 p.m. UTC 
From: Phil Edworthy <phil.edworthy@renesas.com>

The Renesas RZ/N1 SPI Controller is based on the Synopsys DW SSI, but has
additional registers for software CS control and DMA. This patch does not
address the changes required for DMA support, it simply adds the compatible
string. The CS functionality is not very useful and also not needed as
Linux can use gpios for the CS signals.

Add a compatible string to handle any unforeseen issues that may arise, and
pave the way for DMA support.

Signed-off-by: Gareth Williams <gareth.williams.jx@renesas.com>
Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
---
Note: All the other manufacturers detail their compatible strings in
snps,dw-apb-ssi.txt. I think it makes sense for rzn1 to be in it's own file
due to the changes made to the peripheral for DMA support.
---
 Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt
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Patch

diff --git a/Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt b/Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt
new file mode 100644
index 0000000..fb1a672
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/renesas,rzn1-spi.txt
@@ -0,0 +1,11 @@ 
+Renesas RZ/N1 SPI Controller
+
+This controller is based on the Synopsys DW Synchronous Serial Interface and
+inherits all properties defined in snps,dw-apb-ssi.txt except for the
+compatible property.
+
+Required properties:
+- compatible : The device specific string followed by the generic RZ/N1 string.
+   Therefore it must be one of:
+   "renesas,r9a06g032-spi", "renesas,rzn1-spi"
+   "renesas,r9a06g033-spi", "renesas,rzn1-spi"