Thread (7 messages) read the whole thread 7 messages, 3 authors, 2016-12-26
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[PATCH v8 1/5] Documentation: synopsys-dw-mshc: add binding for fifo quirks

From: Jun Nie <hidden>
Date: 2016-12-22 04:57:33
Also in: linux-mmc
Subsystem: multimedia card (mmc), secure digital (sd) and sdio subsystem, open firmware and flattened device tree bindings, the rest · Maintainers: Ulf Hansson, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds

Add fifo-addr property and fifo-watermark-quirk property to
synopsys-dw-mshc bindings. It is intended to provide more
dt interface to support SoCs specific configuration.

Signed-off-by: Jun Nie <redacted>
---
 Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)
diff --git a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
index 7fd17c3..bca30b6 100644
--- a/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
+++ b/Documentation/devicetree/bindings/mmc/synopsys-dw-mshc.txt
@@ -75,6 +75,17 @@ Optional properties:
 * card-detect-delay: Delay in milli-seconds before detecting card after card
   insert event. The default value is 0.
 
+* data-addr: Override fifo address with value provided by DT. The default FIFO reg
+  offset is assumed as 0x100 (version < 0x240A) and 0x200(version >= 0x240A) by
+  driver. If the controller does not follow this rule, please use this property
+  to set fifo address in device tree.
+
+* fifo-watermark-aligned: Data done irq is expected if data length is less than
+  watermark in PIO mode. But fifo watermark is requested to be aligned with data
+  length in some SoC so that TX/RX irq can be generated with data done irq. Add this
+  watermark quirk to mark this requirement and force fifo watermark setting
+  accordingly.
+
 * vmmc-supply: The phandle to the regulator to use for vmmc.  If this is
   specified we'll defer probe until we can find this regulator.
 
@@ -102,6 +113,8 @@ board specific portions as listed below.
 		interrupts = <0 75 0>;
 		#address-cells = <1>;
 		#size-cells = <0>;
+		data-addr = <0x200>;
+		fifo-watermark-aligned;
 		resets = <&rst 20>;
 		reset-names = "reset";
 	};
-- 
1.9.1
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