linux-kernel - Re: [PATCH v1] arm64: dts: imx8mm-verdin: add TPM device

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Date: Mon, 17 Jun 2024 09:18:42 +0200
From: Francesco Dolcini <francesco@...cini.it>
To: Shawn Guo <shawnguo2@...h.net>
Cc: Vitor Soares <ivitro@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Vitor Soares <vitor.soares@...adex.com>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] arm64: dts: imx8mm-verdin: add TPM device

Hello Shawn,

On Mon, Jun 17, 2024 at 10:33:50AM +0800, Shawn Guo wrote:
> On Thu, Jun 13, 2024 at 02:41:50PM +0100, Vitor Soares wrote:
> > From: Vitor Soares <vitor.soares@...adex.com>
> > 
> > Add TPM device found on Verdin iMX8M Mini PID4 0090 variant.
> > 
> > Signed-off-by: Vitor Soares <vitor.soares@...adex.com>
> > ---
> >  arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi | 16 +++++++++++-----
> >  1 file changed, 11 insertions(+), 5 deletions(-)
> > 
> > diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > index 4768b05fd765..c9ae5f0bb526 100644
> > --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
> > @@ -227,15 +227,16 @@ &ecspi2 {
> >  	pinctrl-0 = <&pinctrl_ecspi2>;
> >  };
> >  
> > -/* Verdin CAN_1 (On-module) */
> > +/* On-module SPI */
> >  &ecspi3 {
> >  	#address-cells = <1>;
> >  	#size-cells = <0>;
> > -	cs-gpios = <&gpio5 25 GPIO_ACTIVE_LOW>;
> > +	cs-gpios = <&gpio5 25 GPIO_ACTIVE_LOW>, <&gpio4 19 GPIO_ACTIVE_LOW>;
> >  	pinctrl-names = "default";
> > -	pinctrl-0 = <&pinctrl_ecspi3>;
> > +	pinctrl-0 = <&pinctrl_ecspi3>, <&pinctrl_pmic_tpm_ena>;
> 
> Would it make more sense to have tpm pinctrl in node tpm@1 below?
It's the pinctrl of the SPI Chip Select pin, not something about the
TPM, I think it's correct to have it into the ecspi node.


> > +	verdin_som_tpm: tpm@1 {
> > +		compatible = "atmel,attpm20p", "tcg,tpm_tis-spi";
> > +		reg = <0x1>;
> > +		spi-max-frequency = <36000000>;
> > +	};
> >  };

Francesco