linux-kernel - Re: [PATCH v4 5/6] i2c: at91: print hardware version

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20150603151921.GA2873@katana>
Date:	Thu, 4 Jun 2015 00:19:22 +0900
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Cyrille Pitchen <cyrille.pitchen@...el.com>
Cc:	ludovic.desroches@...el.com, nicolas.ferre@...el.com,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	robh+dt@...nel.org
Subject: Re: [PATCH v4 5/6] i2c: at91: print hardware version

On Wed, Jun 03, 2015 at 11:04:26AM +0200, Cyrille Pitchen wrote:
> The probe() function now prints the hardware version of the I2C
> controller.
> 
> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@...el.com>

Kernel has already very much printout, so I don't see the gain in adding
another one. At least, combine it with the other printout we have
already, but I wonder what new information will be in here? We should
know from the compatible binding which version we serve? Is it really
needed? Helpful for the user?

> ---
>  drivers/i2c/busses/i2c-at91.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
> index 67b4f15..cbe6684 100644
> --- a/drivers/i2c/busses/i2c-at91.c
> +++ b/drivers/i2c/busses/i2c-at91.c
> @@ -85,6 +85,8 @@
>  #define	AT91_TWI_ACR_DATAL(len)	((len) & 0xff)
>  #define	AT91_TWI_ACR_DIR	BIT(8)
>  
> +#define	AT91_TWI_VER		0x00fc	/* Version Register */
> +
>  struct at91_twi_pdata {
>  	unsigned clk_max_div;
>  	unsigned clk_offset;
> @@ -872,6 +874,8 @@ static int at91_twi_probe(struct platform_device *pdev)
>  			return rc;
>  	}
>  
> +	dev_info(dev->dev, "version: %#x\n", at91_twi_read(dev, AT91_TWI_VER));
> +
>  	rc = of_property_read_u32(dev->dev->of_node, "clock-frequency",
>  			&bus_clk_rate);
>  	if (rc)
> -- 
> 1.8.2.2
> 

Download attachment "signature.asc" of type "application/pgp-signature" (820 bytes)