linux-kernel - Re: [PATCH v5 4/5] pinctrl: meson: Add driver support for Amlogic A4 SoCs

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Message-ID: <5913d10c-cf85-407b-948a-db082b0789ac@linaro.org>
Date: Tue, 12 Nov 2024 14:33:11 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: xianwei.zhao@...ogic.com, Linus Walleij <linus.walleij@...aro.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Kevin Hilman <khilman@...libre.com>,
 Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-amlogic@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 4/5] pinctrl: meson: Add driver support for Amlogic A4
 SoCs

Hi,

On 12/11/2024 11:26, Xianwei Zhao via B4 Relay wrote:
> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
> 
> Add a new pinctrl driver for Amlogic A4 SoCs which share
> the same register layout as the previous Amlogic S4.
> 
> Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
> ---
>   drivers/pinctrl/meson/Kconfig              |    6 +
>   drivers/pinctrl/meson/Makefile             |    1 +
>   drivers/pinctrl/meson/pinctrl-amlogic-a4.c | 1335 ++++++++++++++++++++++++++++
>   3 files changed, 1342 insertions(+)
> 

<snip>

> +
> +static int a4_of_gpio_xlate(struct gpio_chip *gc,
> +			    const struct of_phandle_args *gpiospec,
> +			    u32 *flags)
> +{
> +	int gpio_num;
> +
> +	u32 bank  = gpiospec->args[0];
> +	u32 offset = gpiospec->args[1];
> +
> +	if (gc->of_gpio_n_cells < 3) {
> +		WARN_ON(1);
> +		return -EINVAL;
> +	}

This check is unnecessary, drop it, it's already done by of_xlate_and_get_gpiod_flags(),
and if you _really_ want to keep it, move it before accessing gpiospec->args array.

> +
> +	if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
> +		return -EINVAL;

This one aswell, drop it.

> +
> +	switch (bank) {

Just use: switch (gpiospec->args[0]) {

You can even simplify further by dropping offset and using:

int gpio_num = gpiospec->args[1];

and then:

> +	case AMLOGIC_GPIO_B:
> +		if (offset >= GPIOB_NUM)

if (gpio_num >= GPIOB_NUM)

> +			return -EINVAL;
> +		gpio_num = GPIOB_0 + offset;

gpio_num += GPIOB_0;

> +		break;
> +
> +	case AMLOGIC_GPIO_D:
> +		if (offset >= GPIOD_NUM)
> +			return -EINVAL;
> +		gpio_num = GPIOD_0 + offset;
> +		break;
> +
> +	case AMLOGIC_GPIO_E:
> +		if (offset >= GPIOE_NUM)
> +			return -EINVAL;
> +		gpio_num = GPIOE_0 + offset;
> +		break;
> +
> +	case AMLOGIC_GPIO_X:
> +		if (offset >= GPIOX_NUM)
> +			return -EINVAL;
> +		gpio_num = GPIOX_0 + offset;
> +		break;
> +
> +	case AMLOGIC_GPIO_T:
> +		if (offset >= GPIOT_NUM)
> +			return -EINVAL;
> +		gpio_num = GPIOT_0 + offset;
> +		break;
> +
> +	case AMLOGIC_GPIO_TEST_N:
> +		if (offset != 0)
> +			return -EINVAL;
> +		gpio_num = GPIO_TEST_N;
> +		break;
> +
> +	case AMLOGIC_GPIO_AO:
> +		if (offset >= GPIOAO_NUM)
> +			return -EINVAL;
> +		gpio_num = GPIOAO_0 + offset;
> +		break;
> +
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	if (flags)
> +		*flags = gpiospec->args[2];
> +
> +	return gpio_num;
> +}
> +
> +static const struct meson_pinctrl_data a4_periphs_pinctrl_data = {
> +	.name		= "periphs-banks",
> +	.pins		= a4_periphs_pins,
> +	.groups		= a4_periphs_groups,
> +	.funcs		= a4_periphs_functions,
> +	.banks		= a4_periphs_banks,
> +	.num_pins	= ARRAY_SIZE(a4_periphs_pins),
> +	.num_groups	= ARRAY_SIZE(a4_periphs_groups),
> +	.num_funcs	= ARRAY_SIZE(a4_periphs_functions),
> +	.num_banks	= ARRAY_SIZE(a4_periphs_banks),
> +	.pmx_ops	= &meson_axg_pmx_ops,
> +	.pmx_data	= &a4_periphs_pmx_banks_data,
> +	.parse_dt	= &meson_a1_parse_dt_extra,
> +	.of_gpio_n_cells = 3,
> +	.of_xlate	= &a4_of_gpio_xlate,
> +};
> +
> +static const struct meson_pinctrl_data a4_aobus_pinctrl_data = {
> +	.name		= "aobus-banks",
> +	.pins		= a4_aobus_pins,
> +	.groups		= a4_aobus_groups,
> +	.funcs		= a4_aobus_functions,
> +	.banks		= a4_aobus_banks,
> +	.num_pins	= ARRAY_SIZE(a4_aobus_pins),
> +	.num_groups	= ARRAY_SIZE(a4_aobus_groups),
> +	.num_funcs	= ARRAY_SIZE(a4_aobus_functions),
> +	.num_banks	= ARRAY_SIZE(a4_aobus_banks),
> +	.pmx_ops	= &meson_axg_pmx_ops,
> +	.pmx_data	= &a4_aobus_pmx_banks_data,
> +	.parse_dt	= &meson_a1_parse_dt_extra,
> +	.of_gpio_n_cells = 3,
> +	.of_xlate	= &a4_of_gpio_xlate,
> +};
> +
> +static const struct of_device_id a4_pinctrl_dt_match[] = {
> +	{
> +		.compatible = "amlogic,a4-periphs-pinctrl",
> +		.data = &a4_periphs_pinctrl_data,
> +	},
> +	{
> +		.compatible = "amlogic,a4-aobus-pinctrl",
> +		.data = &a4_aobus_pinctrl_data,
> +	},
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, a4_pinctrl_dt_match);
> +
> +static struct platform_driver a4_pinctrl_driver = {
> +	.probe  = meson_pinctrl_probe,
> +	.driver = {
> +		.name	= "amlogic-a4-pinctrl",
> +		.of_match_table = a4_pinctrl_dt_match,
> +	},
> +};
> +
> +module_platform_driver(a4_pinctrl_driver);
> +
> +MODULE_AUTHOR("Xianwei Zhao <xianwei.zhao@...ogic.com>");
> +MODULE_DESCRIPTION("Pin controller and GPIO driver for Amlogic A4 SoC");
> +MODULE_LICENSE("Dual BSD/GPL");
> 

Thanks,
Neil