RE: [PATCH v10 2/2] i2c: aspeed: support ast2600 i2c new register mode driver

[Ryan Chen]

Hello Andi,
> 
> On Sat, Apr 15, 2023 at 09:28:48AM +0800, Ryan Chen wrote:
> > Add i2c new register mode driver to support AST2600 i2c new register
> > mode. AST2600 i2c controller have legacy and new register mode. The
> > new register mode have global register support 4 base clock for scl
> > clock selection, and new clock divider mode. The i2c new register mode
> > have separate register set to control i2c master and slave.
> 
> This commit message is a bit messy, could you please write it more clear?
> 
> [...]
> 
The more statement is in cover letter.
https://patchwork.ozlabs.org/project/linux-aspeed/cover/20230415012848.1777768-1-ryan_chen@xxxxxxxxxxxxxx/


> > +static int ast2600_i2c_probe(struct platform_device *pdev) {
> > +	struct device_node *np = pdev->dev.of_node;
> > +	struct device *dev = &pdev->dev;
> > +	struct ast2600_i2c_bus *i2c_bus;
> > +	struct resource *res;
> > +	u32 global_ctrl;
> > +	int ret = 0;
> > +
> > +	i2c_bus = devm_kzalloc(dev, sizeof(*i2c_bus), GFP_KERNEL);
> > +	if (!i2c_bus)
> > +		return -ENOMEM;
> 
> Let's use dev_err_probe whenever possible, at least we keep a coherent style.

Will modify dev_err_probe to next patch
> 
> [...]
> 
> > +	ret = devm_request_irq(dev, i2c_bus->irq, ast2600_i2c_bus_irq, 0,
> > +			       dev_name(dev), i2c_bus);
> 
> isn't it better to use threaded irq? You have quite an elaborate irq handler, you
> may want to use a thread for it.

Thanks, but I would prefer to stick currently implement of the IRQ request. Thank you for your input.

> 
> > +	if (ret < 0)
> > +		return dev_err_probe(dev, ret, "Unable to request irq %d\n",
> > +i2c_bus->irq);
> > +
> > +	if (of_property_read_bool(dev->of_node, "smbus-alert")) {
> > +		i2c_bus->alert_enable = 1;
> 
> true;

> 
> alert_enable is boolean, make it bool.

Will modify dev_err_probe to next patch

> 
> > +		i2c_bus->ara = i2c_new_smbus_alert_device(&i2c_bus->adap,
> &i2c_bus->alert_data);
> > +		if (!i2c_bus->ara)
> > +			dev_warn(dev, "Failed to register ARA client\n");
> > +
> > +		writel(AST2600_I2CM_PKT_DONE | AST2600_I2CM_BUS_RECOVER |
> AST2600_I2CM_SMBUS_ALT,
> > +		       i2c_bus->reg_base + AST2600_I2CM_IER);
> > +	} else {
> > +		i2c_bus->alert_enable = 0;
> 
> false;

Will modify dev_err_probe to next patch

> 
> I'm not going to review any further, please send the patch after you have run
> checkpatch.pl on it. Thanks!

Sure. 

Thanks, your review.
Ryan Chen.