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Message-ID: <dccb808a2ba6ccb0fd0b4e7ccfe40cd871886b6b.camel@pengutronix.de>
Date: Wed, 24 Jan 2024 10:45:59 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Billy Tsai <billy_tsai@...eedtech.com>, jdelvare@...e.com,
linux@...ck-us.net, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
conor+dt@...nel.org, joel@....id.au, andrew@...econstruct.com.au,
corbet@....net, u.kleine-koenig@...gutronix.de,
naresh.solanki@...ements.com, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-aspeed@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org, linux-pwm@...r.kernel.org,
BMC-SW@...eedtech.com, patrick@...cx.xyz
Subject: Re: [PATCH v13 3/3] hwmon: (aspeed-g6-pwm-tacho): Support for
ASPEED g6 PWM/Fan tach
On Mi, 2024-01-24 at 14:07 +0800, Billy Tsai wrote:
[...]
> +static int aspeed_pwm_tach_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev, *hwmon;
> + int ret;
> + struct device_node *child;
> + struct aspeed_pwm_tach_data *priv;
> +
> + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> + if (!priv)
> + return -ENOMEM;
> + priv->dev = dev;
> + priv->base = devm_platform_ioremap_resource(pdev, 0);
> + if (IS_ERR(priv->base))
> + return PTR_ERR(priv->base);
> +
> + priv->clk = devm_clk_get_enabled(dev, NULL);
> + if (IS_ERR(priv->clk))
> + return dev_err_probe(dev, PTR_ERR(priv->clk),
> + "Couldn't get clock\n");
> + priv->clk_rate = clk_get_rate(priv->clk);
> + priv->reset = devm_reset_control_get_exclusive(dev, NULL);
> + if (IS_ERR(priv->reset))
> + return dev_err_probe(dev, PTR_ERR(priv->reset),
> + "Couldn't get reset control\n");
> +
> + ret = reset_control_deassert(priv->reset);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Couldn't deassert reset control\n");
Consider using devm_add_action_or_reset() to assert the reset in the
error paths and on driver unbind.
> +
> + priv->chip.dev = dev;
> + priv->chip.ops = &aspeed_pwm_ops;
> + priv->chip.npwm = PWM_ASPEED_NR_PWMS;
> +
> + ret = devm_pwmchip_add(dev, &priv->chip);
> + if (ret < 0) {
> + reset_control_assert(priv->reset);
Then this ...
> + return dev_err_probe(dev, ret, "Failed to add PWM chip\n");
> + }
> +
> + for_each_child_of_node(dev->of_node, child) {
> + ret = aspeed_tach_create_fan(dev, child, priv);
> + if (ret < 0) {
> + of_node_put(child);
> + dev_warn(dev, "Failed to create fan %d", ret);
> + return 0;
> + }
> + }
> +
> + of_platform_populate(dev->of_node, NULL, NULL, dev);
> +
> + hwmon = devm_hwmon_device_register_with_info(dev, "aspeed_tach", priv,
> + &aspeed_tach_chip_info, NULL);
> + ret = PTR_ERR_OR_ZERO(hwmon);
> + if (ret) {
> + reset_control_assert(priv->reset);
.. and this ...
> + return dev_err_probe(dev, ret,
> + "Failed to register hwmon device\n");
> + }
> +
> + return 0;
> +}
> +
> +static int aspeed_pwm_tach_remove(struct platform_device *pdev)
> +{
> + struct aspeed_pwm_tach_data *priv = platform_get_drvdata(pdev);
> +
> + reset_control_assert(priv->reset);
> +
> + return 0;
> +}
.. and this could be dropped.
regards
Philipp
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