i2c/muxes/i2c-arb-gpio-challenge.c

1 // SPDX-License-Identifier: GPL-2.0+
10 #include <i2c.h>
11 #include <asm/gpio.h>
29 	debug("%s: %s\n", __func__, mux->name);  in i2c_arbitrator_deselect()
30 	ret = dm_gpio_set_value(&priv->ap_claim, 0);  in i2c_arbitrator_deselect()
31 	udelay(priv->slew_delay_us);  in i2c_arbitrator_deselect()
43 	debug("%s: %s\n", __func__, mux->name);  in i2c_arbitrator_select()
51 		ret = dm_gpio_set_value(&priv->ap_claim, 1);  in i2c_arbitrator_select()
54 		udelay(priv->slew_delay_us);  in i2c_arbitrator_select()
58 		while (get_timer(start_retry) < priv->wait_retry_ms) {  in i2c_arbitrator_select()
59 			ret = dm_gpio_get_value(&priv->ec_claim);  in i2c_arbitrator_select()
72 		ret = dm_gpio_set_value(&priv->ap_claim, 0);  in i2c_arbitrator_select()
76 		mdelay(priv->wait_retry_ms);  in i2c_arbitrator_select()
77 	} while (get_timer(start) < priv->wait_free_ms);  in i2c_arbitrator_select()
80 	printf("I2C: Could not claim bus, timeout %lu\n", get_timer(start));  in i2c_arbitrator_select()
81 	ret = -ETIMEDOUT;  in i2c_arbitrator_select()
90 	const void *blob = gd->fdt_blob;  in i2c_arbitrator_probe()
94 	debug("%s: %s\n", __func__, dev->name);  in i2c_arbitrator_probe()
95 	priv->slew_delay_us = fdtdec_get_int(blob, node, "slew-delay-us", 0);  in i2c_arbitrator_probe()
96 	priv->wait_retry_ms = fdtdec_get_int(blob, node, "wait-retry-us", 0) /  in i2c_arbitrator_probe()
98 	priv->wait_free_ms = fdtdec_get_int(blob, node, "wait-free-us", 0) /  in i2c_arbitrator_probe()
100 	ret = gpio_request_by_name(dev, "our-claim-gpio", 0, &priv->ap_claim,  in i2c_arbitrator_probe()
104 	ret = gpio_request_by_name(dev, "their-claim-gpios", 0, &priv->ec_claim,  in i2c_arbitrator_probe()
112 	dm_gpio_free(dev, &priv->ap_claim);  in i2c_arbitrator_probe()
122 	dm_gpio_free(dev, &priv->ap_claim);  in i2c_arbitrator_remove()
123 	dm_gpio_free(dev, &priv->ec_claim);  in i2c_arbitrator_remove()
134 	{ .compatible = "i2c-arb-gpio-challenge" },