[NOT,FOR,MERGE,16/15] arm: dts: k3-j721e: Update OSPI settings for octal DTR mode
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Message ID 20200226125606.22684-17-p.yadav@ti.com
State Superseded
Delegated to: Jagannadha Sutradharudu Teki
Headers show
Series
  • mtd: spi-nor-core: add xSPI Octal DTR support
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Commit Message

Pratyush Yadav Feb. 26, 2020, 12:56 p.m. UTC
The Cypress Semper flash supports octal DTR mode, so update the device
tree settings to use 8 data lines for both Rx and Tx and allow using DTR
mode on both lines.

The read delay is set to 4. The calibration sequence yields a value of 2
but since the sequence is run before the flash is switched to octal DTR
mode, it gets that value for legacy mode. In octal DTR mode the flash
needs a read delay of 4. Setting read delay here over-rides the
calibrated value.

Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
---
These are the DT changes made on top of u-boot-ti/next to test these
changes.

 arch/arm/dts/k3-j721e-som-p0.dtsi | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--
2.25.0

Patch
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diff --git a/arch/arm/dts/k3-j721e-som-p0.dtsi b/arch/arm/dts/k3-j721e-som-p0.dtsi
index 8497ff3e3e..3e5fefd426 100644
--- a/arch/arm/dts/k3-j721e-som-p0.dtsi
+++ b/arch/arm/dts/k3-j721e-som-p0.dtsi
@@ -85,14 +85,16 @@ 
 	flash@0{
 		compatible = "jedec,spi-nor";
 		reg = <0x0>;
-		spi-tx-bus-width = <1>;
+		spi-tx-bus-width = <8>;
 		spi-rx-bus-width = <8>;
-		spi-max-frequency = <40000000>;
+		spi-tx-dtr = <1>;
+		spi-rx-dtr = <1>;
+		spi-max-frequency = <25000000>;
 		cdns,tshsl-ns = <60>;
 		cdns,tsd2d-ns = <60>;
 		cdns,tchsh-ns = <60>;
 		cdns,tslch-ns = <60>;
-		cdns,read-delay = <0>;
+		cdns,read-delay = <4>;
 		#address-cells = <1>;
 		#size-cells = <1>;
 	};