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

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Date:   Fri, 12 Mar 2021 00:42:16 +0530
From:   Pratyush Yadav <p.yadav@...com>
To:     Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Michael Walle <michael@...le.cc>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mtd@...ts.infradead.org>, <linux-spi@...r.kernel.org>
CC:     Pratyush Yadav <p.yadav@...com>, Lokesh Vutla <lokeshvutla@...com>
Subject: [RFC PATCH 6/6] arm64: dts: ti: k3-j721e-som-p0: Enable PHY calibration

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@...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@0{
 		compatible = "jedec,spi-nor";
@@ -184,6 +186,59 @@ flash@0{
 		cdns,read-delay = <0>;
 		#address-cells = <1>;
 		#size-cells = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partiiton@0 {
+				label = "ospi.tiboot3";
+				reg = <0x0 0x80000>;
+			};
+
+			partition@...00 {
+				label = "ospi.tispl";
+				reg = <0x80000 0x200000>;
+			};
+
+			partition@...000 {
+				label = "ospi.u-boot";
+				reg = <0x280000 0x400000>;
+			};
+
+			partition@...000 {
+				label = "ospi.env";
+				reg = <0x680000 0x20000>;
+			};
+
+			partition@...000 {
+				label = "ospi.env.backup";
+				reg = <0x6a0000 0x20000>;
+			};
+
+			partition@...c0000 {
+				label = "ospi.sysfw";
+				reg = <0x6c0000 0x100000>;
+			};
+
+			partition@...000 {
+				label = "ospi.rootfs";
+				reg = <0x800000 0x37e0000>;
+			};
+
+			calibration_partition: partition@...0000 {
+				compatible = "nvmem-cells";
+				label = "ospi.phypattern";
+				reg = <0x3fe0000 0x20000>;
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				ospi_calibration_data: ospi-calibration-cell@0 {
+					reg = <0x0 0x80>;
+				};
+			};
+		};
 	};
 };

--
2.30.0