linux-kernel - RE: [PATCH 3/7] i2c-eg20t: delete 10bit access processing

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Message-ID: <B6A520E9CD57404AAFC0831E4FB39541A98073B6D2@IRVEXCHCCR02.corp.ad.broadcom.com>
Date:	Tue, 27 Sep 2011 06:06:46 -0700
From:	"Jeffrey (Sheng-Hui) Chu" <jeffchu@...adcom.com>
To:	"Tomoya MORINAGA" <tomoya-linux@....okisemi.com>
cc:	"Jean Delvare" <khali@...ux-fr.org>,
	"Ben Dooks" <ben-linux@...ff.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Qi Wang" <qi.wang@...el.com>,
	"yong.y.wang@...el.com" <yong.y.wang@...el.com>,
	"joel.clark@...el.com" <joel.clark@...el.com>,
	"kok.howg.ewe@...el.com" <kok.howg.ewe@...el.com>,
	"toshiharu-linux@....okisemi.com" <toshiharu-linux@....okisemi.com>,
	"Aaron Smith" <aarons@...adcom.com>
Subject: RE: [PATCH 3/7] i2c-eg20t: delete 10bit access processing

http://www.engadget.com/2011/09/26/broadcom-unveils-smaller-more-power-efficient-40nm-nfc-chips/ 

-----Original Message-----
From: Tomoya MORINAGA [mailto:tomoya-linux@....okisemi.com] 
Sent: Monday, September 26, 2011 8:05 PM
To: Jeffrey (Sheng-Hui) Chu
Cc: Jean Delvare; Ben Dooks; linux-i2c@...r.kernel.org; linux-kernel@...r.kernel.org; Qi Wang; yong.y.wang@...el.com; joel.clark@...el.com; kok.howg.ewe@...el.com; toshiharu-linux@....okisemi.com; Aaron Smith
Subject: Re: [PATCH 3/7] i2c-eg20t: delete 10bit access processing

(2011/09/23 2:49), Jeffrey (Sheng-Hui) Chu wrote:
> The device is BCM20791.  Please contact Aaron Smith (aarons@...adcom.com) for evaluation.
Though googling the device, I can't find the device.
Broadcom website too.

>
> By the way, the existing handling of 10-bit address in the patch you intended to delete does not work.  You'll need to fix that before you can test with the device successfully.
>
> For the write operation, it's a easy fix:
>
> @@ -410,25 +408,16 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
>   	}
>
>   	if (msgs->flags&  I2C_M_TEN) {
> -		addr_2_msb = ((addr&  I2C_MSB_2B_MSK)>>  7);
> +		addr_2_msb = ((addr&  I2C_MSB_2B_MSK)>>  7)&  0x06;
>
>
> For the read operation, static s32 pch_i2c_readbytes(), you'll need to do a write followed by a restart and a read...  please refer to the i2c spec...
>
> Regards,

Thank you for your indication.
We will update this after supporting 10bit access.

Thanks,
tomoya