linux-kernel - Re: [PATCH v7 2/3] rtc: sophgo: add rtc support for Sophgo CV1800 SoC

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Message-ID: <90ae0cad-34a8-4e19-a72f-5e497b72b45c@linaro.org>
Date: Mon, 22 Jan 2024 09:29:15 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Jingbao Qiu <qiujingbao.dlmu@...il.com>, alexandre.belloni@...tlin.com,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 chao.wei@...hgo.com, unicorn_wang@...look.com, paul.walmsley@...ive.com,
 palmer@...belt.com, aou@...s.berkeley.edu
Cc: linux-rtc@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
 dlan@...too.org
Subject: Re: [PATCH v7 2/3] rtc: sophgo: add rtc support for Sophgo CV1800 SoC

On 22/01/2024 09:06, Jingbao Qiu wrote:
> Implement the RTC driver for CV1800, which able to provide time alarm
> and calibrate functionality.
> 
> Signed-off-by: Jingbao Qiu <qiujingbao.dlmu@...il.com>
> ---
> 
> Depends on https://lore.kernel.org/all/IA1PR20MB4953C774D41EDF1EADB6EC18BB6D2@IA1PR20MB4953.namprd20.prod.outlook.com/
> 

Why?

How could a RTC driver depend on clock driver or clock bindings? This
looks wrong and it prevents your driver being merged via easy path.

> diff --git a/drivers/rtc/rtc-cv1800.c b/drivers/rtc/rtc-cv1800.c
> new file mode 100644
> index 000000000000..fbf2e575ea94
> --- /dev/null
> +++ b/drivers/rtc/rtc-cv1800.c
> @@ -0,0 +1,406 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * rtc-cv1800.c: RTC driver for Sophgo cv1800 RTC
> + *
> + * Author: Jingbao Qiu <qiujingbao.dlmu@...il.com>
> + */
> +#include <linux/kernel.h>
> +#include <linux/clk.h>
> +#include <linux/module.h>
> +#include <linux/irq.h>
> +#include <linux/delay.h>
> +#include <linux/rtc.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/syscon.h>

Drop

> +#include <linux/regmap.h>
> +#include <linux/of.h>

Keep the includes sorted, prefferably alphabetically.

..

> +
> +static int cv1800_rtc_probe(struct platform_device *pdev)
> +{
> +	struct cv1800_rtc_priv *rtc;
> +	uint32_t ctrl_val;
> +	void __iomem *base;
> +	int ret;
> +
> +	rtc = devm_kzalloc(&pdev->dev, sizeof(struct cv1800_rtc_priv),

sizeof(*)

> +			   GFP_KERNEL);
> +	if (!rtc)
> +		return -ENOMEM;
> +
> +	base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(base))
> +		return PTR_ERR(base);
> +
> +	rtc->rtc_map =

Unneeded blank line. Don't wrap at =.

> +		devm_regmap_init_mmio(&pdev->dev, base, &cv1800_rtc_regmap_config);
> +	if (IS_ERR(rtc->rtc_map))
> +		return PTR_ERR(rtc->rtc_map);
> +
> +	rtc->irq = platform_get_irq(pdev, 0);
> +	if (rtc->irq < 0)
> +		return rtc->irq;
> +
> +	ret = devm_request_irq(&pdev->dev, rtc->irq, cv1800_rtc_irq_handler,
> +			       IRQF_TRIGGER_HIGH, "alarm", &pdev->dev);
> +	if (ret)
> +		return dev_err_probe(&pdev->dev, ret,
> +				     "cannot register interrupt handler\n");
> +
> +	rtc->clk = devm_clk_get_enabled(&pdev->dev, NULL);
> +	if (IS_ERR(rtc->clk))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(rtc->clk),
> +				     "clk not found\n");
> +
> +	rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev);
> +	if (IS_ERR(rtc->rtc_dev))
> +		return PTR_ERR(rtc->rtc_dev);
> +
> +	platform_set_drvdata(pdev, rtc);
> +
> +	rtc->rtc_dev->ops = &cv1800_rtc_ops;
> +	rtc->rtc_dev->range_max = U32_MAX;
> +
> +	/* if use internal clk,so coarse calibrate rtc */
> +	regmap_read(rtc->rtc_map, CTRL, &ctrl_val);
> +	ctrl_val &= CTRL_MODE_MASK;


Best regards,
Krzysztof