linux-kernel - Re: [PATCHv3 1/2] i2c: designware: introduce a custom scl recovery for SoCFPGA platforms

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Date:   Wed, 15 Jun 2022 13:23:53 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Dinh Nguyen <dinguyen@...nel.org>
Cc:     jarkko.nikula@...ux.intel.com, mika.westerberg@...ux.intel.com,
        robh+dt@...nel.org, krzk+dt@...nel.org, linux-i2c@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCHv3 1/2] i2c: designware: introduce a custom scl recovery
 for SoCFPGA platforms

On Wed, Jun 15, 2022 at 01:18:55PM +0300, Andy Shevchenko wrote:
> On Mon, Jun 13, 2022 at 04:00:31PM -0500, Dinh Nguyen wrote:


The below won't fly, see my corrections below.

> static int i2c_dw_init_socfpga_recovery_info(struct dw_i2c_dev *dev,
> 					     struct i2c_bus_recovery_info *rinfo)
> {
> 	rinfo->recover_bus = i2c_socfpga_scl_recovery;
> 	return 0;

	return 1;

> }
> 
> static int i2c_dw_init_generic_recovery_info(struct dw_i2c_dev *dev,
> 					     struct i2c_bus_recovery_info *rinfo)
> {
> 	struct i2c_adapter *adap = &dev->adapter;
> 	struct gpio_desc *gpio;
> 
> 	gpio = devm_gpiod_get_optional(dev->dev, "scl", GPIOD_OUT_HIGH);
> 	if (IS_ERR_OR_NULL(gpio))
> 		return PTR_ERR_OR_ZERO(gpio);
> 
> 	rinfo->scl_gpiod = gpio;
> 
> 	gpio = devm_gpiod_get_optional(dev->dev, "sda", GPIOD_IN);
> 	if (IS_ERR(gpio))
> 		return PTR_ERR(gpio);
> 	rinfo->sda_gpiod = gpio;
> 
> 	rinfo->recover_bus = i2c_generic_scl_recovery;
> 
> 	dev_info(dev->dev, "running with gpio recovery mode! scl%s",
> 		 rinfo->sda_gpiod ? ",sda" : "");
> 
> 	return 0;

	return 1;

> }
> 
> static int i2c_dw_init_recovery_info(struct dw_i2c_dev *dev)
> {
> 	struct i2c_bus_recovery_info *rinfo = &dev->rinfo;
> 	struct i2c_adapter *adap = &dev->adapter;
> 	int ret;
> 
> 	switch (dev->flags & MODEL_MASK) {
> 	case MODEL_SOCFPGA:
> 		ret = i2c_dw_init_socfpga_recovery_info(dev, rinfo);
> 		break;
> 	default:
> 		ret = i2c_dw_init_generic_recovery_info(dev, rinfo);
> 		break;
> 	}
> 	if (ret)

	/* The recovery is optional, that's why 0 should be returned to the caller */
	if (ret <= 0)

> 		return ret;
> 
> 	rinfo->prepare_recovery = i2c_dw_prepare_recovery;
> 	rinfo->unprepare_recovery = i2c_dw_unprepare_recovery;
> 	adap->bus_recovery_info = rinfo;
> 
> 	return 0;
> }

-- 
With Best Regards,
Andy Shevchenko