linux-kernel - Re: [PATCH v16 2/3] i2c: aspeed: support AST2600 i2c new register mode driver

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Message-ID: <ee0f5b583aadb42e7557e1afc49c5b9af594d2c3.camel@pengutronix.de>
Date: Mon, 24 Feb 2025 09:54:27 +0100
From: Philipp Zabel <p.zabel@...gutronix.de>
To: Ryan Chen <ryan_chen@...eedtech.com>, benh@...nel.crashing.org, 
 joel@....id.au, andi.shyti@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
  conor+dt@...nel.org, andrew@...econstruct.com.au, 
 andriy.shevchenko@...ux.intel.com, linux-i2c@...r.kernel.org, 
 openbmc@...ts.ozlabs.org, devicetree@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-aspeed@...ts.ozlabs.org, 
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v16 2/3] i2c: aspeed: support AST2600 i2c new register
 mode driver

On Mo, 2025-02-24 at 13:59 +0800, Ryan Chen wrote:
> Add i2c new register mode driver to support AST2600 i2c
> new register mode. AST2600 i2c controller have legacy and
> new register mode. The new register mode have global register
> support 4 base clock for scl clock selection, and new clock
> divider mode. The new register mode have separate register
> set to control i2c controller and target. This patch is for i2c
> controller mode driver.
> 
> Signed-off-by: Ryan Chen <ryan_chen@...eedtech.com>
> ---
>  drivers/i2c/busses/Kconfig       |   11 +
>  drivers/i2c/busses/Makefile      |    1 +
>  drivers/i2c/busses/i2c-ast2600.c | 1036 ++++++++++++++++++++++++++++++
>  3 files changed, 1048 insertions(+)
>  create mode 100644 drivers/i2c/busses/i2c-ast2600.c
> 
[...]
> diff --git a/drivers/i2c/busses/i2c-ast2600.c b/drivers/i2c/busses/i2c-ast2600.c
> new file mode 100644
> index 000000000000..bfac507693dd
> --- /dev/null
> +++ b/drivers/i2c/busses/i2c-ast2600.c
> @@ -0,0 +1,1036 @@
[...]
> +static int ast2600_i2c_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct ast2600_i2c_bus *i2c_bus;
> +	struct resource *res;
> +	u32 global_ctrl;
> +	int ret;
> +
> +	i2c_bus = devm_kzalloc(dev, sizeof(*i2c_bus), GFP_KERNEL);
> +	if (!i2c_bus)
> +		return -ENOMEM;
> +
> +	i2c_bus->reg_base = devm_platform_ioremap_resource(pdev, 0);
> +	if (IS_ERR(i2c_bus->reg_base))
> +		return PTR_ERR(i2c_bus->reg_base);
> +
> +	i2c_bus->rst = devm_reset_control_get_shared(dev, NULL);
> +	if (IS_ERR(i2c_bus->rst))
> +		return dev_err_probe(dev, PTR_ERR(i2c_bus->rst), "Missing reset ctrl\n");
> +
> +	reset_control_deassert(i2c_bus->rst);

No reset_control_assert() in the error paths below? You could get that
and simplify this by using devm_reset_control_get_shared_deasserted().

regards
Philipp