On Mon, Oct 31, 2022 at 06:38:08PM +0800, Billy Tsai wrote:
> This patch add the support of Tachometer which can use to monitor the
> frequency of the input. The tach supports up to 16 channels and it's part
> function of multi-function device "pwm-tach controller".
>
> Signed-off-by: Billy Tsai <billy_tsai@xxxxxxxxxxxxxx>
> ---
> drivers/hwmon/Kconfig | 9 +
> drivers/hwmon/Makefile | 1 +
> drivers/hwmon/tach-aspeed-ast2600.c | 692 ++++++++++++++++++++++++++++
Please also provide Documentation/hwmon/tach-aspeed-ast2600.rst.
[ ... ]
> + hwmon = devm_hwmon_device_register_with_groups(dev, "aspeed_tach", priv,
> + priv->groups);
Please use the new hwmon api (devm_hwmon_device_register_with_info).
> + ret = PTR_ERR_OR_ZERO(hwmon);
> + if (ret) {
> + dev_err_probe(dev, ret, "Failed to register hwmon device\n");
> + goto err_assert_reset;
> + }
> + platform_set_drvdata(pdev, priv);
> + return 0;
> +err_assert_reset:
> + reset_control_assert(priv->reset);
> +err_disable_clk:
> + clk_disable_unprepare(priv->clk);
You should be able to use devm_clk_get_enabled() to handle
the clock. If reset handling has to come first, you could use
devm_add_action_or_reset() for it. This way you would
not need the remove function, and error cleanup would
be much simplified.
Thanks,
Guenter
> + return ret;
> +}
> +
> +static int aspeed_tach_remove(struct platform_device *pdev)
> +{
> + struct aspeed_tach_data *priv = platform_get_drvdata(pdev);
> +
> + reset_control_assert(priv->reset);
> + clk_disable_unprepare(priv->clk);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id of_stach_match_table[] = {
> + {
> + .compatible = "aspeed,ast2600-tach",
> + },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, of_stach_match_table);
> +
> +static struct platform_driver aspeed_tach_driver = {
> + .probe = aspeed_tach_probe,
> + .remove = aspeed_tach_remove,
> + .driver = {
> + .name = "aspeed_tach",
> + .of_match_table = of_stach_match_table,
> + },
> +};
> +
> +module_platform_driver(aspeed_tach_driver);
> +
> +MODULE_AUTHOR("Billy Tsai <billy_tsai@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("Aspeed ast2600 TACH device driver");
> +MODULE_LICENSE("GPL v2");
> +
> --
> 2.25.1
>
