1 // SPDX-License-Identifier: GPL-2.0
3  * Copyright (C) 2017-2025 Arm Ltd.
5  * Generic DT driven Allwinner pinctrl driver routines.
7  * described in the DT. Then hands those tables of to the traditional
10  * out in a per-SoC .c file. This code generates this table, like so:
18  *    SUNXI_FUNCTION(0x2, "mmc0"),	// based on pingroup found in DT:
19  *				//   mmc0-pins {
36 #include "pinctrl-sunxi.h"
46 static u8 sunxi_pinctrl_dt_read_pinmux(const struct device_node *node,  in sunxi_pinctrl_dt_read_pinmux()  argument
52 	num_elems = of_property_count_u32_elems(node, "allwinner,pinmux");  in sunxi_pinctrl_dt_read_pinmux()
57 		index = num_elems - 1;  in sunxi_pinctrl_dt_read_pinmux()
59 	ret = of_property_read_u32_index(node, "allwinner,pinmux", index,  in sunxi_pinctrl_dt_read_pinmux()
79 	int port_base = desc->pin_base / PINS_PER_BANK;  in init_pins_table()
88 		desc->npins += pins_per_bank[i];  in init_pins_table()
97 			name_size += (pins_per_bank[i] - 10) * 5;  in init_pins_table()
101 	if (desc->npins == 0) {  in init_pins_table()
103 		return ERR_PTR(-EINVAL);  in init_pins_table()
106 	pins = devm_kzalloc(dev, desc->npins * sizeof(*pins), GFP_KERNEL);  in init_pins_table()
108 		return ERR_PTR(-ENOMEM);  in init_pins_table()
113 		return ERR_PTR(-ENOMEM);  in init_pins_table()
123 			cur_pin->pin.number = (port_base + i) * PINS_PER_BANK + j;  in init_pins_table()
124 			cur_pin->pin.name = cur_name;  in init_pins_table()
134  * child node of the pinctrl DT node to find all advertised functions.
135  * Provide memory to hold the per-function information and assign it to
138  * an "irq" function at the end, for those pins in IRQ-capable ports.
139  * We do not fill in the extra functions (those describe in DT nodes) yet.
148 	struct device_node *node;  in prepare_function_table()  local
155 	 * - one for GPIO in  in prepare_function_table()
156 	 * - one for GPIO out  in prepare_function_table()
157 	 * - one for the sentinel signalling the end of the list  in prepare_function_table()
169 		int bank = pin->pin.number / PINS_PER_BANK;  in prepare_function_table()
172 			pin->variant++;  in prepare_function_table()
178 	 * Go over each pin group (every child of the pinctrl DT node) and  in prepare_function_table()
183 	for_each_child_of_node(pnode, node) {  in prepare_function_table()
186 		of_property_for_each_string(node, "pins", prop, name) {  in prepare_function_table()
204 		return -ENOMEM;  in prepare_function_table()
214 		int bank = pin->pin.number / PINS_PER_BANK;  in prepare_function_table()
215 		int lastfunc = pin->variant + 1;  in prepare_function_table()
228 			func[lastfunc].irqnum = pin->pin.number % PINS_PER_BANK;  in prepare_function_table()
235 		pin->functions = func;  in prepare_function_table()
238 		func += pin->variant + 3;  in prepare_function_table()
244 		pin->variant = 2;  in prepare_function_table()
256 static void fill_pin_function(struct device *dev, struct device_node *node,  in fill_pin_function()  argument
265 	if (of_property_read_string(node, "function", &funcname)) {  in fill_pin_function()
271 	of_property_for_each_string(node, "pins", prop, name) {  in fill_pin_function()
278 				 of_node_full_name(node), name);  in fill_pin_function()
284 		muxval = sunxi_pinctrl_dt_read_pinmux(node, index);  in fill_pin_function()
287 				 of_node_full_name(node), name);  in fill_pin_function()
293 		 * Check for double definitions by comparing the to-be-added  in fill_pin_function()
302 			if (strcmp(func->name, funcname) &&  in fill_pin_function()
303 			    func->muxval != muxval)  in fill_pin_function()
307 			if (!strcmp(func->name, funcname) &&  in fill_pin_function()
308 			    muxval == func->muxval)  in fill_pin_function()
325 		func->muxval = muxval;  in fill_pin_function()
326 		func->name = funcname;  in fill_pin_function()
337  * Then iterate over all pinctrl DT node children to enter the function name
347 	struct device_node *pnode = pdev->dev.of_node, *node;  in sunxi_pinctrl_dt_table_init()  local
351 	pins = init_pins_table(&pdev->dev, pins_per_bank, desc);  in sunxi_pinctrl_dt_table_init()
355 	ret = prepare_function_table(&pdev->dev, pnode, pins, desc->npins,  in sunxi_pinctrl_dt_table_init()
364 	for_each_child_of_node(pnode, node)  in sunxi_pinctrl_dt_table_init()
365 		fill_pin_function(&pdev->dev, node, pins, desc->npins);  in sunxi_pinctrl_dt_table_init()
368 	for (i = 0; i < desc->npins; i++)  in sunxi_pinctrl_dt_table_init()
371 	desc->pins = pins;  in sunxi_pinctrl_dt_table_init()