linux-kernel - Re: [v3 3/3] hwmon: Add Aspeed ast2600 TACH support

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Date:   Wed, 2 Nov 2022 10:37:20 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Billy Tsai <billy_tsai@...eedtech.com>
Cc:     jdelvare@...e.com, linux@...ck-us.net, robh+dt@...nel.org,
        joel@....id.au, andrew@...id.au, lee.jones@...aro.org,
        thierry.reding@...il.com, u.kleine-koenig@...gutronix.de,
        p.zabel@...gutronix.de, 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-pwm@...r.kernel.org, BMC-SW@...eedtech.com,
        garnermic@...a.com
Subject: Re: [v3 3/3] hwmon: Add Aspeed ast2600 TACH support

Le 02/11/2022 à 09:36, Billy Tsai a écrit :
> 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@...eedtech.com>
> Reported-by: kernel test robot <lkp@...el.com>
> ---
>   Documentation/hwmon/index.rst               |   1 +
>   Documentation/hwmon/tach-aspeed-ast2600.rst |  28 ++
>   drivers/hwmon/Kconfig                       |   9 +
>   drivers/hwmon/Makefile                      |   1 +
>   drivers/hwmon/tach-aspeed-ast2600.c         | 476 ++++++++++++++++++++
>   5 files changed, 515 insertions(+)
>   create mode 100644 Documentation/hwmon/tach-aspeed-ast2600.rst
>   create mode 100644 drivers/hwmon/tach-aspeed-ast2600.c
> 

[...]

> +static int aspeed_tach_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np, *child;
> +	struct aspeed_tach_data *priv;
> +	struct device *hwmon;
> +	struct platform_device *parent_dev;
> +	int ret;
> +
> +	np = dev->parent->of_node;
> +	if (!of_device_is_compatible(np, "aspeed,ast2600-pwm-tach"))
> +		return dev_err_probe(dev, -ENODEV,
> +				     "Unsupported tach device binding\n");
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +	priv->dev = &pdev->dev;
> +	priv->tach_channel =
> +		devm_kcalloc(dev, TACH_ASPEED_NR_TACHS,
> +			     sizeof(*priv->tach_channel), GFP_KERNEL);

Hi,
the error handling is still missing:

	if (!priv->tach_channel)
		return -ENOMEM;

CJ

> +
> +	priv->regmap = syscon_node_to_regmap(np);
> +	if (IS_ERR(priv->regmap))
> +		return dev_err_probe(dev, PTR_ERR(priv->regmap),
> +				     "Couldn't get regmap\n");
> +	parent_dev = of_find_device_by_node(np);
> +	priv->clk = devm_clk_get_enabled(&parent_dev->dev, NULL);
> +	if (IS_ERR(priv->clk))
> +		return dev_err_probe(dev, PTR_ERR(priv->clk),
> +				     "Couldn't get clock\n");
> +

[...]