linux-kernel - Re: [PATCH v6 10/12] reset: Add Nuvoton ma35d1 reset driver support

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Date:   Mon, 24 Apr 2023 22:02:53 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Jacky Huang <ychuang570808@...il.com>
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lee@...nel.org, mturquette@...libre.com, sboyd@...nel.org,
        gregkh@...uxfoundation.org, jirislaby@...nel.org,
        devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        arnd@...db.de, schung@...oton.com, mjchen@...oton.com,
        Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH v6 10/12] reset: Add Nuvoton ma35d1 reset driver support

Hi Jacky,

On Tue, Mar 28, 2023 at 02:19:10AM +0000, Jacky Huang wrote:
> From: Jacky Huang <ychuang3@...oton.com>
> 
> This driver supports individual IP reset for ma35d1. The reset
> control registers is a subset of system control registers.
> 
> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
> ---
>  drivers/reset/Kconfig        |   6 ++
>  drivers/reset/Makefile       |   1 +
>  drivers/reset/reset-ma35d1.c | 152 +++++++++++++++++++++++++++++++++++
>  3 files changed, 159 insertions(+)
>  create mode 100644 drivers/reset/reset-ma35d1.c
> 
[...]
> diff --git a/drivers/reset/reset-ma35d1.c b/drivers/reset/reset-ma35d1.c
> new file mode 100644
> index 000000000000..221299e7b873
> --- /dev/null
> +++ b/drivers/reset/reset-ma35d1.c
> @@ -0,0 +1,152 @@
[...]
> +static int ma35d1_reset_update(struct reset_controller_dev *rcdev,
> +			       unsigned long id, bool assert)
> +{
> +	unsigned int reg;
> +	int ret;
> +	int offset = (id / RST_PRE_REG) * 4;
> +	struct ma35d1_reset_data *data =
> +			container_of(rcdev, struct ma35d1_reset_data, rcdev);
> +
> +	ret = regmap_read(data->regmap, REG_SYS_IPRST0 + offset, &reg);
> +	if (ret < 0)
> +		return ret;
> +	if (assert)
> +		reg |= 1 << (id % RST_PRE_REG);
> +	else
> +		reg &= ~(1 << (id % RST_PRE_REG));
> +
> +	return regmap_write(data->regmap, REG_SYS_IPRST0 + offset, reg);

This should use regmap_update_bits().

[...]
> +static int ma35d1_reset_status(struct reset_controller_dev *rcdev,
> +			      unsigned long id)
> +{
> +	int reg, ret;
> +	int offset = id / RST_PRE_REG;

Should this be

	int offset = (id / RST_PRE_REG) * 4;

?

> +static int ma35d1_reset_probe(struct platform_device *pdev)
> +{
> +	int err;
> +	struct device *dev = &pdev->dev;
> +	struct device_node *parent;
> +	struct ma35d1_reset_data *reset_data;
> +	struct ma35d1_reboot_data *reboot_data;
> +
> +	if (!pdev->dev.of_node) {
> +		dev_err(&pdev->dev, "Device tree node not found\n");
> +		return -EINVAL;
> +	}
> +
> +	reset_data = devm_kzalloc(dev, sizeof(*reset_data), GFP_KERNEL);
> +	if (!reset_data)
> +		return -ENOMEM;
> +
> +	reboot_data = devm_kzalloc(dev, sizeof(*reboot_data), GFP_KERNEL);
> +	if (!reboot_data)
> +		return -ENOMEM;

These structures could be combined into one.

regards
Philipp