linux-kernel - Re: [PATCH v1 2/2] pinctrl: nuvoton: add NPCM8XX pinctrl and GPIO driver

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Date:   Tue, 12 Jul 2022 11:50:45 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tomer Maimon <tmaimon77@...il.com>, avifishman70@...il.com,
        tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com,
        linus.walleij@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, j.neuschaefer@....net,
        zhengbin13@...wei.com
Cc:     openbmc@...ts.ozlabs.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 2/2] pinctrl: nuvoton: add NPCM8XX pinctrl and GPIO
 driver

On 10/07/2022 12:21, Tomer Maimon wrote:
> Add pinctrl and GPIO controller driver support to Arbel BMC NPCM8XX SoC.
> 
> Arbel BMC NPCM8XX pinctrl driver based on Poleg NPCM7XX, except the
> pin mux mapping difference the NPCM8XX GPIO supports adjust debounce
> period time.
> 
> Signed-off-by: Tomer Maimon <tmaimon77@...il.com>

(...)

> +
> +static int npcm8xx_pinctrl_probe(struct platform_device *pdev)
> +{
> +	struct npcm8xx_pinctrl *pctrl;
> +	int ret;
> +
> +	pctrl = devm_kzalloc(&pdev->dev, sizeof(*pctrl), GFP_KERNEL);
> +	if (!pctrl)
> +		return -ENOMEM;
> +
> +	pctrl->dev = &pdev->dev;
> +	dev_set_drvdata(&pdev->dev, pctrl);
> +
> +	pctrl->gcr_regmap =
> +		syscon_regmap_lookup_by_compatible("nuvoton,npcm845-gcr");

No. Use property. By this patchset, I would expect that you learnt from
previous mistakes around this. Why repeating the same trouble second time?

> +	if (IS_ERR(pctrl->gcr_regmap)) {
> +		dev_err(pctrl->dev, "didn't find nuvoton,npcm845-gcr\n");
> +		return PTR_ERR(pctrl->gcr_regmap);
> +	}
> +
> +	ret = npcm8xx_gpio_of(pctrl);
> +	if (ret < 0) {
> +		dev_err(pctrl->dev, "Failed to gpio dt-binding %u\n", ret);
> +		return ret;
> +	}
> +
> +	pctrl->pctldev = devm_pinctrl_register(&pdev->dev,
> +					       &npcm8xx_pinctrl_desc, pctrl);
> +	if (IS_ERR(pctrl->pctldev)) {
> +		dev_err(&pdev->dev, "Failed to register pinctrl device\n");
> +		return PTR_ERR(pctrl->pctldev);
> +	}
> +
> +	ret = npcm8xx_gpio_register(pctrl);
> +	if (ret < 0) {
> +		dev_err(pctrl->dev, "Failed to register gpio %u\n", ret);
> +		return ret;
> +	}
> +
> +	pr_info("npcm8xx Pinctrl driver probed\n");


No pr_ in devices. No success debug messages.

> +	return 0;
> +}
> +
> +static const struct of_device_id npcm8xx_pinctrl_match[] = {
> +	{ .compatible = "nuvoton,npcm845-pinctrl" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, npcm8xx_pinctrl_match);
> +
> +static struct platform_driver npcm8xx_pinctrl_driver = {
> +	.probe = npcm8xx_pinctrl_probe,
> +	.driver = {
> +		.name = "npcm8xx-pinctrl",
> +		.of_match_table = npcm8xx_pinctrl_match,
> +		.suppress_bind_attrs = true,
> +	},
> +};
> +
> +static int __init npcm8xx_pinctrl_register(void)
> +{
> +	return platform_driver_register(&npcm8xx_pinctrl_driver);
> +}
> +arch_initcall(npcm8xx_pinctrl_register);
> +
> +MODULE_LICENSE("GPL v2");
> +MODULE_AUTHOR("tomer.maimon@...oton.com");
> +MODULE_DESCRIPTION("Nuvoton NPCM8XX Pinctrl and GPIO driver");


Best regards,
Krzysztof