linux-kernel - Re: [PATCH v4 2/2] tpm: Add TPM 2.0 support to the Nuvoton i2c driver (NPCT6xx family)

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Date:	Mon, 18 Jul 2016 21:00:24 +0300
From:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:	andrew.zamansky@...oton.com, tpmdd-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] tpm: Add TPM 2.0 support to the Nuvoton i2c
 driver (NPCT6xx family)

On Tue, Jul 12, 2016 at 11:41:50AM -0600, Jason Gunthorpe wrote:
> The command flow is exactly the same, the core simply needs to be
> told to enable TPM2 mode when the compatible string indicates a
> TPM2.
> 
> Signed-off-by: Andrew Azmansky <andrew.zamansky@...oton.com>
> Tested-by: Andrew Zamansky <andrew.zamansky@...oton.com>
> Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
> Acked-by: Rob Herring <robh@...nel.org>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

I've been on a vacation since last week and will be until Aug 8th.
That's why there might be some delay with code reviews.

/Jarkko

> ---
>  .../devicetree/bindings/i2c/trivial-devices.txt    |  1 +
>  drivers/char/tpm/tpm_i2c_nuvoton.c                 | 26 +++++++++++++++++-----
>  2 files changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/i2c/trivial-devices.txt b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> index 539874490492..d4f654276cf9 100644
> --- a/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> +++ b/Documentation/devicetree/bindings/i2c/trivial-devices.txt
> @@ -62,6 +62,7 @@ national,lm80		Serial Interface ACPI-Compatible Microprocessor System Hardware M
>  national,lm85		Temperature sensor with integrated fan control
>  national,lm92		±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
>  nuvoton,npct501		i2c trusted platform module (TPM)
> +nuvoton,npct601		i2c trusted platform module (TPM2)
>  nxp,pca9556		Octal SMBus and I2C registered interface
>  nxp,pca9557		8-bit I2C-bus and SMBus I/O port with reset
>  nxp,pcf8563		Real-time clock/calendar
> diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
> index 6e404e0211dd..e3a9155ee671 100644
> --- a/drivers/char/tpm/tpm_i2c_nuvoton.c
> +++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
> @@ -1,5 +1,5 @@
> -/******************************************************************************
> - * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501,
> + /******************************************************************************
> + * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501/NPCT6XX,
>   * based on the TCG TPM Interface Spec version 1.2.
>   * Specifications at www.trustedcomputinggroup.org
>   *
> @@ -31,6 +31,7 @@
>  #include <linux/interrupt.h>
>  #include <linux/wait.h>
>  #include <linux/i2c.h>
> +#include <linux/of_device.h>
>  #include "tpm.h"
>  
>  /* I2C interface offsets */
> @@ -52,7 +53,8 @@
>  #define TPM_I2C_RETRY_DELAY_SHORT      2       /* msec */
>  #define TPM_I2C_RETRY_DELAY_LONG       10      /* msec */
>  
> -#define I2C_DRIVER_NAME "tpm_i2c_nuvoton"
> +#define OF_IS_TPM2 ((void *)1)
> +#define I2C_IS_TPM2 1
>  
>  struct priv_data {
>  	int irq;
> @@ -165,7 +167,7 @@ static int i2c_nuvoton_get_burstcount(struct i2c_client *client,
>  }
>  
>  /*
> - * WPCT301/NPCT501 SINT# supports only dataAvail
> + * WPCT301/NPCT501/NPCT6XX SINT# supports only dataAvail
>   * any call to this function which is not waiting for dataAvail will
>   * set queue to NULL to avoid waiting for interrupt
>   */
> @@ -545,6 +547,16 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
>  	if (!priv)
>  		return -ENOMEM;
>  
> +	if (dev->of_node) {
> +		const struct of_device_id *of_id;
> +
> +		of_id = of_match_device(dev->driver->of_match_table, dev);
> +		if (of_id && of_id->data == OF_IS_TPM2)
> +			chip->flags |= TPM_CHIP_FLAG_TPM2;
> +	} else
> +		if (id->driver_data == I2C_IS_TPM2)
> +			chip->flags |= TPM_CHIP_FLAG_TPM2;
> +
>  	init_waitqueue_head(&priv->read_queue);
>  
>  	/* Default timeouts */
> @@ -620,7 +632,8 @@ static int i2c_nuvoton_remove(struct i2c_client *client)
>  }
>  
>  static const struct i2c_device_id i2c_nuvoton_id[] = {
> -	{I2C_DRIVER_NAME, 0},
> +	{"tpm_i2c_nuvoton"},
> +	{"tpm2_i2c_nuvoton", .driver_data = I2C_IS_TPM2},
>  	{}
>  };
>  MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id);
> @@ -629,6 +642,7 @@ MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id);
>  static const struct of_device_id i2c_nuvoton_of_match[] = {
>  	{.compatible = "nuvoton,npct501"},
>  	{.compatible = "winbond,wpct301"},
> +	{.compatible = "nuvoton,npct601", .data = OF_IS_TPM2},
>  	{},
>  };
>  MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match);
> @@ -641,7 +655,7 @@ static struct i2c_driver i2c_nuvoton_driver = {
>  	.probe = i2c_nuvoton_probe,
>  	.remove = i2c_nuvoton_remove,
>  	.driver = {
> -		.name = I2C_DRIVER_NAME,
> +		.name = "tpm_i2c_nuvoton",
>  		.pm = &i2c_nuvoton_pm_ops,
>  		.of_match_table = of_match_ptr(i2c_nuvoton_of_match),
>  	},
> -- 
> 2.1.4
>