linux-kernel - Re: [PATCH v2 3/5] i2c: at91: add support for new alternative command mode

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Message-ID: <20150601175154.GN4710@piout.net>
Date:	Mon, 1 Jun 2015 19:51:54 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Cyrille Pitchen <cyrille.pitchen@...el.com>
Cc:	ludovic.desroches@...el.com, nicolas.ferre@...el.com,
	linux-i2c@...r.kernel.org, wsa@...-dreams.de, mark.rutland@....com,
	devicetree@...r.kernel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, linux-kernel@...r.kernel.org,
	robh+dt@...nel.org, galak@...eaurora.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 3/5] i2c: at91: add support for new alternative
 command mode

Hi,

On 01/06/2015 at 17:49:13 +0200, Cyrille Pitchen wrote :
> @@ -504,8 +589,22 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num)
>  		at91_twi_write(dev, AT91_TWI_IADR, internal_address);
>  	}
>  
> -	at91_twi_write(dev, AT91_TWI_MMR, (m_start->addr << 16) | int_addr_flag
> -		       | ((m_start->flags & I2C_M_RD) ? AT91_TWI_MREAD : 0));
> +	is_read = (m_start->flags & I2C_M_RD);
> +	if (dev->pdata->has_alt_cmd) {
> +		if (m_start->len > 0) {
> +			at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_ACMEN);
> +			at91_twi_write(dev, AT91_TWI_ACR,
> +				       AT91_TWI_ACR_DATAL(m_start->len) |
> +				       ((is_read) ? AT91_TWI_ACR_DIR : 0));
> +			use_alt_cmd = true;
> +		} else
> +			at91_twi_write(dev, AT91_TWI_CR, AT91_TWI_ACMDIS);

braces {} should be used on all arms of this statement



-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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