linux-kernel - Re: [PATCH v3 4/4] pinctrl: nuvoton: Add ma35d1 pinctrl and GPIO driver

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Date: Sun, 28 Jan 2024 08:52:12 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Jacky Huang <ychuang570808@...il.com>, linus.walleij@...aro.org,
 robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 p.zabel@...gutronix.de, j.neuschaefer@....net
Cc: linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 ychuang3@...oton.com, schung@...oton.com
Subject: Re: [PATCH v3 4/4] pinctrl: nuvoton: Add ma35d1 pinctrl and GPIO
 driver

Le 23/01/2024 à 09:06, Jacky Huang a écrit :
> From: Jacky Huang <ychuang3@...oton.com>
> 
> Add common pinctrl and GPIO driver for Nuvoton MA35 series SoC, and
> add support for ma35d1 pinctrl.
> 
> Signed-off-by: Jacky Huang <ychuang3@...oton.com>
> ---

Hi,

Should there be a v4, a few nits below.

CJ

> +static int ma35_pinctrl_dt_node_to_map_func(struct pinctrl_dev *pctldev,
> +					    struct device_node *np,
> +					    struct pinctrl_map **map,
> +					    unsigned int *num_maps)
> +{
> +	struct ma35_pinctrl *npctl = pinctrl_dev_get_drvdata(pctldev);
> +	struct ma35_pin_group *grp;
> +	struct pinctrl_map *new_map;
> +	struct device_node *parent;
> +	int map_num = 1;
> +	int i;
> +
> +	/*
> +	 * first find the group of this node and check if we need create
> +	 * config maps for pins
> +	 */
> +	grp = ma35_pinctrl_find_group_by_name(npctl, np->name);
> +	if (!grp) {
> +		dev_err(npctl->dev, "unable to find group for node %s\n", np->name);
> +		return -EINVAL;
> +	}
> +
> +	map_num += grp->npins;
> +	new_map = devm_kzalloc(pctldev->dev, sizeof(*new_map) * map_num, GFP_KERNEL);

devm_kcalloc()?

> +	if (!new_map)
> +		return -ENOMEM;
> +
> +	*map = new_map;
> +	*num_maps = map_num;
> +	/* create mux map */
> +	parent = of_get_parent(np);
> +	if (!parent) {
> +		devm_kfree(pctldev->dev, new_map);
> +		return -EINVAL;
> +	}
> +
> +	new_map[0].type = PIN_MAP_TYPE_MUX_GROUP;
> +	new_map[0].data.mux.function = parent->name;
> +	new_map[0].data.mux.group = np->name;
> +	of_node_put(parent);
> +
> +	new_map++;
> +	for (i = 0; i < grp->npins; i++) {
> +		new_map[i].type = PIN_MAP_TYPE_CONFIGS_PIN;
> +		new_map[i].data.configs.group_or_pin = pin_get_name(pctldev, grp->pins[i]);
> +		new_map[i].data.configs.configs = grp->settings[i].configs;
> +		new_map[i].data.configs.num_configs = grp->settings[i].nconfigs;
> +	}
> +	dev_dbg(pctldev->dev, "maps: function %s group %s num %d\n",
> +		(*map)->data.mux.function, (*map)->data.mux.group, map_num);
> +
> +	return 0;
> +}

..

> +static int ma35_pinctrl_parse_groups(struct device_node *np, struct ma35_pin_group *grp,
> +				     struct ma35_pinctrl *npctl, u32 index)
> +{
> +	unsigned long *configs;
> +	unsigned int nconfigs;
> +	struct ma35_pin_setting *pin;
> +	const __be32 *list;
> +	int i, j, size, ret;
> +
> +	dev_dbg(npctl->dev, "group(%d): %s\n", index, np->name);
> +
> +	grp->name = np->name;
> +
> +	ret = pinconf_generic_parse_dt_config(np, NULL, &configs, &nconfigs);
> +	if (ret)
> +		return ret;
> +
> +	/*
> +	 * the binding format is nuvoton,pins = <bank pin-mfp pin-function>,
> +	 * do sanity check and calculate pins number
> +	 */
> +	list = of_get_property(np, "nuvoton,pins", &size);
> +	size /= sizeof(*list);
> +	if (!size || size % 3) {
> +		dev_err(npctl->dev, "wrong setting!\n");
> +		return -EINVAL;
> +	}
> +	grp->npins = size / 3;
> +
> +	grp->pins = devm_kzalloc(npctl->dev, grp->npins * sizeof(*grp->pins), GFP_KERNEL);

devm_kcalloc()?

> +	if (!grp->pins)
> +		return -ENOMEM;
> +
> +	grp->settings = devm_kzalloc(npctl->dev, grp->npins * sizeof(*grp->settings), GFP_KERNEL);

devm_kcalloc()?

> +	if (!grp->settings)
> +		return -ENOMEM;
> +
> +	pin = grp->settings;
> +
> +	for (i = 0, j = 0; i < size; i += 3, j++) {
> +		pin->offset = be32_to_cpu(*list++) * MA35_MFP_REG_SZ_PER_BANK + MA35_MFP_REG_BASE;
> +		pin->shift = (be32_to_cpu(*list++) * MA35_MFP_BITS_PER_PORT) % 32;
> +		pin->muxval = be32_to_cpu(*list++);
> +		pin->configs = configs;
> +		pin->nconfigs = nconfigs;
> +		grp->pins[j] = npctl->info->get_pin_num(pin->offset, pin->shift);
> +		pin++;
> +	}
> +	return 0;
> +}
> +
> +static int ma35_pinctrl_parse_functions(struct device_node *np, struct ma35_pinctrl *npctl,
> +					u32 index)
> +{
> +	struct device_node *child;
> +	struct ma35_pin_func *func;
> +	struct ma35_pin_group *grp;
> +	static u32 grp_index;
> +	u32 ret, i = 0;
> +
> +	dev_dbg(npctl->dev, "parse function(%d): %s\n", index, np->name);
> +
> +	func = &npctl->functions[index];
> +	func->name = np->name;
> +	func->ngroups = of_get_child_count(np);
> +
> +	if (func->ngroups <= 0)
> +		return 0;
> +
> +	func->groups = devm_kzalloc(npctl->dev, func->ngroups * sizeof(char *), GFP_KERNEL);

devm_kcalloc()?

> +	if (!func->groups)
> +		return -ENOMEM;
> +
> +	for_each_child_of_node(np, child) {
> +		func->groups[i] = child->name;
> +		grp = &npctl->groups[grp_index++];
> +		ret = ma35_pinctrl_parse_groups(child, grp, npctl, i++);
> +		if (ret) {
> +			of_node_put(child);
> +			return ret;
> +		}
> +	}
> +	return 0;
> +}