[RFC PATCH 6/6] arm64: dts: ti: k3-j721e-som-p0: Enable PHY calibration

[Pratyush Yadav]

For running the flash in 8D-8D-8D mode at 166 MHz (controller ref clock
speed), PHY calibration procedure needs to run to calculate the proper
line delays.

To perform this calibration, the controller needs to know the location
of the pre-determined calibration pattern on the flash. Add a fixed
partition table that contains the calibration partition, along with the
rest of the partitions for the platform. Also add a nvmem cell that
points to the calibration partition.

Signed-off-by: Pratyush Yadav <p.yadav at ti.com>
---

Based on patch
https://patchwork.kernel.org/project/linux-arm-kernel/patch/20210305153926.3479-2-p.yadav@ti.com/

 arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi | 55 +++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
index 2fee2906183d..6013ebb45517 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-som-p0.dtsi
@@ -170,6 +170,8 @@ J721E_WKUP_IOPAD(0x002c, PIN_OUTPUT, 0) /* MCU_OSPI0_CSn0 */
 &ospi0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&mcu_fss0_ospi0_pins_default>;
+	nvmem-cells = <&ospi_calibration_data>;
+	nvmem-cell-names = "calibration";

 	flash at 0{
 		compatible = "jedec,spi-nor";
@@ -184,6 +186,59 @@ flash at 0{
 		cdns,read-delay = <0>;
 		#address-cells = <1>;
 		#size-cells = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partiiton at 0 {
+				label = "ospi.tiboot3";
+				reg = <0x0 0x80000>;
+			};
+
+			partition at 80000 {
+				label = "ospi.tispl";
+				reg = <0x80000 0x200000>;
+			};
+
+			partition at 280000 {
+				label = "ospi.u-boot";
+				reg = <0x280000 0x400000>;
+			};
+
+			partition at 680000 {
+				label = "ospi.env";
+				reg = <0x680000 0x20000>;
+			};
+
+			partition at 6a0000 {
+				label = "ospi.env.backup";
+				reg = <0x6a0000 0x20000>;
+			};
+
+			partition at 0x6c0000 {
+				label = "ospi.sysfw";
+				reg = <0x6c0000 0x100000>;
+			};
+
+			partition at 800000 {
+				label = "ospi.rootfs";
+				reg = <0x800000 0x37e0000>;
+			};
+
+			calibration_partition: partition at 3fe0000 {
+				compatible = "nvmem-cells";
+				label = "ospi.phypattern";
+				reg = <0x3fe0000 0x20000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				ospi_calibration_data: ospi-calibration-cell at 0 {
+					reg = <0x0 0x80>;
+				};
+			};
+		};
 	};
 };

--
2.30.0