6b689d0207
This includes helper function for pin configuration and a DT binding for the pinctrl DT node. There's two important notes to be made regarding this protocol: * pinctrl drivers have no subsytem API to implement as opposed to clock control drivers. Because of this (and the fact that `pinctrl_configure_pins()` doesn't require a `struct device` handle) the pinctrl driver consists only of a helper function, which implements the `PINCTRL_CONFIGURE_PINS` command. Additionally, the `scmi_protocol` structure is defined inside the pinctrl helpers source file to avoid redundant code (otherwise, each SCMI-based pinctrl driver would have to define it its source file). * each vendor may have their own set of pin propeties and DT representations for them. Because of this, there can't be a generic, SCMI-based pinctrl driver. As such, each vendor who wants to use the SCMI support for pinctrl operations will have to implement their pinctrl driver (which, to put it simply, revolves around implemeting `pinctrl_configure_pins()`) and make use of the pin configuration function introduced in this commit. Moreover, this means that each vendor will have control over the way their pin properties are encoded in the `scmi_pinctrl_settings` structure. Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@nxp.com>
63 lines
1.2 KiB
C
63 lines
1.2 KiB
C
/*
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* Copyright 2024 NXP
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/drivers/firmware/scmi/pinctrl.h>
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DT_SCMI_PROTOCOL_DEFINE_NODEV(DT_INST(0, arm_scmi_pinctrl), NULL);
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int scmi_pinctrl_settings_configure(struct scmi_pinctrl_settings *settings)
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{
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struct scmi_protocol *proto;
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struct scmi_message msg, reply;
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uint32_t config_num;
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int32_t status, ret;
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proto = &SCMI_PROTOCOL_NAME(SCMI_PROTOCOL_PINCTRL);
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/* sanity checks */
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if (!settings) {
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return -EINVAL;
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}
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if (!proto) {
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return -EINVAL;
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}
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if (proto->id != SCMI_PROTOCOL_PINCTRL) {
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return -EINVAL;
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}
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config_num = SCMI_PINCTRL_ATTRIBUTES_CONFIG_NUM(settings->attributes);
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if (!config_num) {
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return -EINVAL;
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}
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if ((config_num * 2) > ARM_SCMI_PINCTRL_MAX_CONFIG_SIZE) {
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return -EINVAL;
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}
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msg.hdr = SCMI_MESSAGE_HDR_MAKE(SCMI_PINCTRL_MSG_PINCTRL_SETTINGS_CONFIGURE,
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SCMI_COMMAND, proto->id, 0x0);
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msg.len = sizeof(*settings) -
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(ARM_SCMI_PINCTRL_MAX_CONFIG_SIZE - config_num * 2) * 4;
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msg.content = settings;
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reply.hdr = msg.hdr;
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reply.len = sizeof(status);
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reply.content = &status;
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ret = scmi_send_message(proto, &msg, &reply);
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if (ret < 0) {
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return ret;
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}
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if (status != SCMI_SUCCESS) {
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return scmi_status_to_errno(status);
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}
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return 0;
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}
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