linux-kernel - Re: [PATCH v6 3/4] firmware: arm_scmi: Add SCMI v3.2 pincontrol protocol basic support

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Date: Wed, 27 Mar 2024 13:46:11 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: Sudeep Holla <sudeep.holla@....com>,
	Cristian Marussi <cristian.marussi@....com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-gpio@...r.kernel.org,
	Peng Fan <peng.fan@....com>,
	Oleksii Moisieiev <oleksii_moisieiev@...m.com>
Subject: Re: [PATCH v6 3/4] firmware: arm_scmi: Add SCMI v3.2 pincontrol
 protocol basic support

Looks really nice.  Just a few small comments below.

On Sat, Mar 23, 2024 at 08:15:16PM +0800, Peng Fan (OSS) wrote:
> +
> +struct scmi_msg_func_set {
> +	__le32 identifier;
> +	__le32 function_id;
> +	__le32 flags;
> +};

This scmi_msg_func_set struct is unused.  Delete.

> +static void
> +iter_pinctrl_settings_get_prepare_message(void *message, u32 desc_index,
> +					  const void *priv)
> +{
> +	struct scmi_msg_settings_get *msg = message;
> +	const struct scmi_settings_get_ipriv *p = priv;
> +	u32 attributes;
> +
> +	attributes = FIELD_PREP(CONFIG_FLAG_MASK, p->flag) |
> +		     FIELD_PREP(SELECTOR_MASK, p->type);
> +
> +	if (p->flag == 1)
> +		attributes |= FIELD_PREP(SKIP_CONFIGS_MASK, desc_index);
> +	else if (!p->flag)

This is a nit-pick but could you change these !p->flag conditions to
p->flag == 0?  It's a number zero, not a bool.

> +		attributes |= FIELD_PREP(CONFIG_TYPE_MASK, p->config_types[0]);
> +
> +	msg->attributes = cpu_to_le32(attributes);
> +	msg->identifier = cpu_to_le32(p->selector);
> +}
> +
> +static int
> +iter_pinctrl_settings_get_update_state(struct scmi_iterator_state *st,
> +				       const void *response, void *priv)
> +{
> +	const struct scmi_resp_settings_get *r = response;
> +	struct scmi_settings_get_ipriv *p = priv;
> +
> +	if (p->flag == 1) {
> +		st->num_returned = le32_get_bits(r->num_configs, GENMASK(7, 0));
> +		st->num_remaining = le32_get_bits(r->num_configs,
> +						  GENMASK(31, 24));
> +	} else {
> +		st->num_returned = 1;
> +		st->num_remaining = 0;
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +iter_pinctrl_settings_get_process_response(const struct scmi_protocol_handle *ph,
> +				       const void *response,
> +				       struct scmi_iterator_state *st,
> +				       void *priv)
> +{
> +	const struct scmi_resp_settings_get *r = response;
> +	struct scmi_settings_get_ipriv *p = priv;
> +
> +	if (!p->flag) {


if (p->flag == 0) {

> +		if (p->config_types[0] !=
> +		    le32_get_bits(r->configs[st->loop_idx * 2], GENMASK(7, 0)))
> +			return -EINVAL;
> +	} else if (p->flag == 1) {
> +		p->config_types[st->desc_index + st->loop_idx] =
> +			le32_get_bits(r->configs[st->loop_idx * 2],
> +				      GENMASK(7, 0));
> +	} else if (p->flag == 2) {
> +		return 0;
> +	}
> +
> +	p->config_values[st->desc_index + st->loop_idx] =
> +		le32_to_cpu(r->configs[st->loop_idx * 2 + 1]);
> +
> +	return 0;
> +}
> +
> +static int
> +scmi_pinctrl_settings_get(const struct scmi_protocol_handle *ph, u32 selector,
> +			  enum scmi_pinctrl_selector_type type,
> +			  enum scmi_pinctrl_conf_type config_type,
> +			  u32 *config_value)
> +{
> +	int ret;
> +	void *iter;
> +	struct scmi_iterator_ops ops = {
> +		.prepare_message = iter_pinctrl_settings_get_prepare_message,
> +		.update_state = iter_pinctrl_settings_get_update_state,
> +		.process_response = iter_pinctrl_settings_get_process_response,
> +	};
> +	struct scmi_settings_get_ipriv ipriv = {
> +		.selector = selector,
> +		.type = type,
> +		.flag = 0,

->flag should be 0-2.

> +		.config_types = &config_type,
> +		.config_values = config_value,
> +	};
> +
> +	if (!config_value || type == FUNCTION_TYPE)
             ^^^^^^^^^^^^
config_value should be optional for flag == 2.

regards,
dan carpenter

> +		return -EINVAL;
> +
> +	ret = scmi_pinctrl_validate_id(ph, selector, type);
> +	if (ret)
> +		return ret;
> +
> +	iter = ph->hops->iter_response_init(ph, &ops, 1, PINCTRL_SETTINGS_GET,
> +					    sizeof(struct scmi_msg_settings_get),
> +					    &ipriv);
> +
> +	if (IS_ERR(iter))
> +		return PTR_ERR(iter);
> +
> +	return ph->hops->iter_response_run(iter);
> +}
> +