linux-kernel - Re: [PATCH] arm64: dts: ti: k3-am62d2-evm: Add support for OSPI flash

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Message-ID: <20250822183014.apyvqws4afiqiymb@specks>
Date: Fri, 22 Aug 2025 13:30:14 -0500
From: Nishanth Menon <nm@...com>
To: Paresh Bhagat <p-bhagat@...com>
CC: <vigneshr@...com>, <praneeth@...com>, <kristo@...nel.org>,
        <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <khasim@...com>, <v-singh1@...com>,
        <afd@...com>, <bb@...com>, <s-k6@...com>
Subject: Re: [PATCH] arm64: dts: ti: k3-am62d2-evm: Add support for OSPI flash

On 14:33-20250813, Paresh Bhagat wrote:
> AM62D2 EVM has S28HS512T 64 MiB Octal SPI NOR flash connected to the
> OSPI interface. Add support for the flash and describe the partition
> information as per bootloader.
> 
> Signed-off-by: Paresh Bhagat <p-bhagat@...com>
> ---
> Boot logs
> https://gist.github.com/paresh-bhagat12/262d8c64e692d22c4e48363d246fb083

We already have issues with am62d that needs fixing:
cpu cpu0: _of_add_opp_table_v2: no supported OPPs
cpu cpu0: OPP table can't be empty

and

Please enable defconfig for this device
arch/arm64/boot/dts/ti/k3-am62d2-evm.dts:       typec_pd0: usb-power-controller@3f {

We can look at adding features for am62d after the above are done.
> 
> Tech Ref Manual-https://www.ti.com/lit/pdf/sprujd4
> Schematics Link-https://www.ti.com/lit/zip/sprcal5
> 
>  arch/arm64/boot/dts/ti/k3-am62d2-evm.dts | 86 ++++++++++++++++++++++++
>  1 file changed, 86 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts b/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
> index daea18b0bc61..aa943ef52fb5 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
> +++ b/arch/arm64/boot/dts/ti/k3-am62d2-evm.dts
> @@ -25,6 +25,7 @@ aliases {
>  		rtc0 = &wkup_rtc0;
>  		ethernet0 = &cpsw_port1;
>  		ethernet1 = &cpsw_port2;
> +		spi0 = &ospi0;
>  	};
>  
>  	chosen {
> @@ -367,6 +368,26 @@ usr_led_pins_default: usr-led-default-pins {
>  			AM62DX_IOPAD(0x0244, PIN_INPUT, 7) /* (D18) MMC1_SDWP.GPIO1_49 */
>  		>;
>  	};
> +
> +	ospi0_pins_default: ospi0-default-pins {
> +		pinctrl-single,pins = <
> +			AM62DX_IOPAD(0x0000, PIN_OUTPUT, 0) /* (L22) OSPI0_CLK */
> +			AM62DX_IOPAD(0x002c, PIN_OUTPUT, 0) /* (H21) OSPI0_CSn0 */
> +			AM62DX_IOPAD(0x0030, PIN_OUTPUT, 0) /* (G19) OSPI0_CSn1 */
> +			AM62DX_IOPAD(0x0034, PIN_OUTPUT, 0) /* (K20) OSPI0_CSn2 */
> +			AM62DX_IOPAD(0x0038, PIN_OUTPUT, 0) /* (G20) OSPI0_CSn3 */
> +			AM62DX_IOPAD(0x000c, PIN_INPUT, 0) /* (J21) OSPI0_D0 */
> +			AM62DX_IOPAD(0x0010, PIN_INPUT, 0) /* (J18) OSPI0_D1 */
> +			AM62DX_IOPAD(0x0014, PIN_INPUT, 0) /* (J19) OSPI0_D2 */
> +			AM62DX_IOPAD(0x0018, PIN_INPUT, 0) /* (H18) OSPI0_D3 */
> +			AM62DX_IOPAD(0x001c, PIN_INPUT, 0) /* (K21) OSPI0_D4 */
> +			AM62DX_IOPAD(0x0020, PIN_INPUT, 0) /* (H19) OSPI0_D5 */
> +			AM62DX_IOPAD(0x0024, PIN_INPUT, 0) /* (J20) OSPI0_D6 */
> +			AM62DX_IOPAD(0x0028, PIN_INPUT, 0) /* (J22) OSPI0_D7 */
> +			AM62DX_IOPAD(0x0008, PIN_INPUT, 0) /* (L21) OSPI0_DQS */
> +		>;
> +		bootph-all;
> +	};
>  };
>  
>  &mcu_gpio0 {
> @@ -613,3 +634,68 @@ &c7x_0 {
>  &main_rti4 {
>  	status = "reserved";
>  };
> +
> +&fss {
> +	status = "okay";
> +};
> +
> +&ospi0 {
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&ospi0_pins_default>;
> +	status = "okay";
> +
> +	flash@0{
> +		compatible = "jedec,spi-nor";
> +		reg = <0x0>;
> +		spi-tx-bus-width = <8>;
> +		spi-rx-bus-width = <8>;
> +		spi-max-frequency = <25000000>;
> +		cdns,tshsl-ns = <60>;
> +		cdns,tsd2d-ns = <60>;
> +		cdns,tchsh-ns = <60>;
> +		cdns,tslch-ns = <60>;
> +		cdns,read-delay = <4>;
> +
> +		partitions {
> +			compatible = "fixed-partitions";
> +			#address-cells = <1>;
> +			#size-cells = <1>;
> +
> +			partition@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 0x40000>;
> +			};
> +
> +			partition@...000 {
> +				label = "ospi.env.backup";
> +				reg = <0x6c0000 0x40000>;
> +			};
> +
> +			partition@...000 {
> +				label = "ospi.rootfs";
> +				reg = <0x800000 0x37c0000>;
> +			};
> +
> +			partition@...0000 {
> +				label = "ospi.phypattern";
> +				reg = <0x3fc0000 0x40000>;
> +				bootph-all;
> +			};
> +		};
> +	};
> +};
> -- 
> 2.34.1
> 
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D
https://ti.com/opensource