linux-kernel - Re: [5/5] i2c: davinci: use ICPFUNC to toggle I2C as gpio for bus recovery

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Message-ID: <20141123170400.GC4431@pengutronix.de>
Date:	Sun, 23 Nov 2014 18:04:00 +0100
From:	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
To:	Grygorii Strashko <grygorii.strashko@...com>
Cc:	Wolfram Sang <wsa@...-dreams.de>, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Sekhar Nori <nsekhar@...com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Santosh Shilimkar <ssantosh@...nel.org>,
	Murali Karicheri <m-karicheri2@...com>,
	Ben Gardiner <bengardiner@...ometrics.ca>,
	Mike Looijmans <milo-software@...rs.sourceforge.net>
Subject: Re: [5/5] i2c: davinci: use ICPFUNC to toggle I2C as gpio for bus
 recovery

Hello,

On Thu, Nov 20, 2014 at 12:03:08PM +0200, Grygorii Strashko wrote:
> @@ -664,6 +759,7 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  		if (!of_property_read_u32(pdev->dev.of_node, "clock-frequency",
>  			&prop))
>  			dev->pdata->bus_freq = prop / 1000;
> +		dev->pdata->has_pfunc = true;
I don't understand this. Why does this ICPFUNC recovery work if the bus
is probed by oftree, but doesn't if not?

>  	} else if (!dev->pdata) {
>  		dev->pdata = &davinci_i2c_platform_data_default;
>  	}
> @@ -705,7 +801,9 @@ static int davinci_i2c_probe(struct platform_device *pdev)
>  	adap->timeout = DAVINCI_I2C_TIMEOUT;
>  	adap->dev.of_node = pdev->dev.of_node;
>  
> -	if (dev->pdata->scl_pin) {
> +	if (dev->pdata->has_pfunc)
> +		adap->bus_recovery_info = &davinci_i2c_scl_recovery_info;
> +	else if (dev->pdata->scl_pin) {
>  		adap->bus_recovery_info = &davinci_i2c_gpio_recovery_info;
>  		adap->bus_recovery_info->scl_gpio = dev->pdata->scl_pin;
>  		adap->bus_recovery_info->sda_gpio = dev->pdata->sda_pin;
> diff --git a/include/linux/platform_data/i2c-davinci.h b/include/linux/platform_data/i2c-davinci.h
> index 2312d19..89fd347 100644
> --- a/include/linux/platform_data/i2c-davinci.h
> +++ b/include/linux/platform_data/i2c-davinci.h
> @@ -18,6 +18,7 @@ struct davinci_i2c_platform_data {
>  	unsigned int	bus_delay;	/* post-transaction delay (usec) */
>  	unsigned int    sda_pin;        /* GPIO pin ID to use for SDA */
>  	unsigned int    scl_pin;        /* GPIO pin ID to use for SCL */
> +	bool		has_pfunc;	/*chip has a ICPFUNC register */
Space after /* please

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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