Re: [PATCH v1] arm64: dts: ti: verdin-am62: mallow: add TPM device

[Andrew Davis <afd@ti.com>]

On 1/26/24 10:51 AM, Francesco Dolcini wrote:
> From: Francesco Dolcini <francesco.dolcini@toradex.com>
> 
> Add TPM device to Mallow device tree file, the device is connected to
> the SoC with SPI1/CS1, the same SPI interface is also available on an
> extension header together with an additional CS0 signal.
> 
> Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
> ---
>   arch/arm64/boot/dts/ti/k3-am62-verdin-mallow.dtsi | 10 ++++++++++
>   1 file changed, 10 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-verdin-mallow.dtsi b/arch/arm64/boot/dts/ti/k3-am62-verdin-mallow.dtsi
> index 17b93534f658..77b1beb638ad 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-verdin-mallow.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-verdin-mallow.dtsi
> @@ -127,6 +127,16 @@ &main_spi1 {
>   		    <&pinctrl_qspi1_cs2_gpio>;
>   	cs-gpios = <0>, <&main_gpio0 12 GPIO_ACTIVE_LOW>;
>   	status = "okay";
> +
> +	tpm@1 {
> +		compatible = "infineon,slb9670", "tcg,tpm_tis-spi";
> +		reg = <1>;
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&pinctrl_qspi1_dqs_gpio>;
> +		interrupt-parent = <&main_gpio1>;
> +		interrupts = <18 IRQ_TYPE_EDGE_FALLING>;

Just a heads-up, the SLB9670 datasheet says this device uses
an active low interrupt (IRQ_TYPE_LEVEL_LOW). Using TYPE_EDGE
here can cause missed interrupts if the line stays low for
multiple interrupts.

Andrew

> +		spi-max-frequency = <18500000>;
> +	};
>   };
>   
>   /* Verdin UART_3 */