Only a couple of comments below. Otherwise, the patch looks fine to me.
On Thu, Jan 26, 2017 at 09:00:31PM +0800, Baoyou Xie wrote:
<snip>
> +static int zx2967_i2c_flush_fifos(struct zx2967_i2c_info *zx_i2c)
> +{
> + u32 val;
> + u32 offset;
> +
> + if (zx_i2c->msg_rd) {
> + offset = REG_RDCONF;
> + val = I2C_RFIFO_RESET;
> + } else {
> + offset = REG_WRCONF;
> + val = I2C_WFIFO_RESET;
> + }
> +
> + val |= zx2967_i2c_readl(zx_i2c, offset);
> + zx2967_i2c_writel(zx_i2c, val, offset);
> +
> + return 0;
Since the function will never return other values than 0, should we
simply define the return type as void?
> +}
<snip>
> +static int zx2967_i2c_probe(struct platform_device *pdev)
> +{
> + struct zx2967_i2c_info *zx_i2c;
> + void __iomem *reg_base;
> + struct resource *res;
> + struct clk *clk;
> + int ret;
> +
> + zx_i2c = devm_kzalloc(&pdev->dev, sizeof(*zx_i2c), GFP_KERNEL);
> + if (!zx_i2c)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + reg_base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(reg_base))
> + return PTR_ERR(reg_base);
> +
> + clk = devm_clk_get(&pdev->dev, NULL);
> + if (IS_ERR(clk)) {
> + dev_err(&pdev->dev, "missing controller clock");
> + return PTR_ERR(clk);
> + }
> +
> + ret = clk_prepare_enable(clk);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to enable i2c_clk\n");
> + return ret;
> + }
> +
> + ret = platform_get_irq(pdev, 0);
> + if (ret < 0)
> + return ret;
> + zx_i2c->irq = ret;
> +
> + ret = device_property_read_u32(&pdev->dev, "clock-frequency",
> + &zx_i2c->clk_freq);
> + if (ret) {
> + dev_err(&pdev->dev, "missing clock-frequency");
> + return ret;
> + }
> +
> + zx_i2c->reg_base = reg_base;
> + zx_i2c->clk = clk;
> + zx_i2c->dev = &pdev->dev;
> +
> + zx_i2c->pin_ctrl = devm_pinctrl_get_select_default(&pdev->dev);
> + if (IS_ERR(zx_i2c->pin_ctrl)) {
> + if (PTR_ERR(zx_i2c->pin_ctrl) == -EPROBE_DEFER)
> + return -EPROBE_DEFER;
> + dev_info(&pdev->dev, "no pinctrl handle\n");
> + }
You do not need this boilerplate code for request "default" pin state,
since device core will automatically issue the call. See section "Pin
control requests from drivers" in Documentation/pinctrl.txt for more
info.
Shawn
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