linux-kernel - Re: [PATCH-v3 02/11] i2c: pxa: No need to set slave addr for i2c master mode reset

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Message-ID: <20150710081148.GB1528@katana>
Date:	Fri, 10 Jul 2015 10:11:48 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	robert.jarzmik@...e.fr, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, robh+dt@...nel.org,
	"Jett.Zhou" <jtzhou@...vell.com>
Subject: Re: [PATCH-v3 02/11] i2c: pxa: No need to set slave addr for i2c
 master mode reset

On Tue, Jul 07, 2015 at 12:54:46AM +0530, Vaibhav Hiremath wrote:
> Normally i2c controller works as master, so slave addr is not needed, or it
> will impact some slave device (eg. ST NFC chip) i2c accesses, because it has
> the same i2c address with controller.

Just to make sure: Does it? As I read the code, slave interrupts are
enabled later only when slave mode is selected? Is that a HW bug? And if
so, can't the code just be moved into this #ifdef block later?

> 
> Signed-off-by: Jett.Zhou <jtzhou@...vell.com>
> Signed-off-by: Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
> Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>
> ---
>  drivers/i2c/busses/i2c-pxa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
> index f4ac8c5..023e59f 100644
> --- a/drivers/i2c/busses/i2c-pxa.c
> +++ b/drivers/i2c/busses/i2c-pxa.c
> @@ -459,7 +459,7 @@ static void i2c_pxa_reset(struct pxa_i2c *i2c)
>  	writel(I2C_ISR_INIT, _ISR(i2c));
>  	writel(readl(_ICR(i2c)) & ~ICR_UR, _ICR(i2c));
>  
> -	if (i2c->reg_isar)
> +	if (i2c->reg_isar && IS_ENABLED(CONFIG_I2C_PXA_SLAVE))
>  		writel(i2c->slave_addr, _ISAR(i2c));
>  
>  	/* set control register values */
> -- 
> 1.9.1
> 

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