Lines Matching +full:latched +full:- +full:gpios
1 // SPDX-License-Identifier: GPL-2.0
10 * CLK0 ----------------------. ,--------.
11 * CLK1 -------------------. `--------|> #0 |
13 * OUT0 ----------------+--|-----------|D0 Q0|-----|<
14 * OUT1 --------------+-|--|-----------|D1 Q1|-----|<
15 * OUT2 ------------+-|-|--|-----------|D2 Q2|-----|<
16 * OUT3 ----------+-|-|-|--|-----------|D3 Q3|-----|<
17 * OUT4 --------+-|-|-|-|--|-----------|D4 Q4|-----|<
18 * OUT5 ------+-|-|-|-|-|--|-----------|D5 Q5|-----|<
19 * OUT6 ----+-|-|-|-|-|-|--|-----------|D6 Q6|-----|<
20 * OUT7 --+-|-|-|-|-|-|-|--|-----------|D7 Q7|-----|<
21 * | | | | | | | | | `--------'
23 * | | | | | | | | | ,--------.
24 * | | | | | | | | `-----------|> #1 |
26 * | | | | | | | `--------------|D0 Q0|-----|<
27 * | | | | | | `----------------|D1 Q1|-----|<
28 * | | | | | `------------------|D2 Q2|-----|<
29 * | | | | `--------------------|D3 Q3|-----|<
30 * | | | `----------------------|D4 Q4|-----|<
31 * | | `------------------------|D5 Q5|-----|<
32 * | `--------------------------|D6 Q6|-----|<
33 * `----------------------------|D7 Q7|-----|<
34 * `--------'
37 * the number of inputs per latch is derived from the number of GPIOs given
62 * Depending on whether any of the underlying GPIOs may sleep we either
80 int latch = offset / priv->n_latched_gpios, i, ret; in gpio_latch_set_unlocked()
82 assign_bit(offset, priv->shadow, val); in gpio_latch_set_unlocked()
84 for (i = 0; i < priv->n_latched_gpios; i++) { in gpio_latch_set_unlocked()
85 ret = set(priv->latched_gpios->desc[i], in gpio_latch_set_unlocked()
86 test_bit(latch * priv->n_latched_gpios + i, in gpio_latch_set_unlocked()
87 priv->shadow)); in gpio_latch_set_unlocked()
92 ndelay(priv->setup_duration_ns); in gpio_latch_set_unlocked()
93 set(priv->clk_gpios->desc[latch], 1); in gpio_latch_set_unlocked()
94 ndelay(priv->clock_duration_ns); in gpio_latch_set_unlocked()
95 set(priv->clk_gpios->desc[latch], 0); in gpio_latch_set_unlocked()
104 guard(spinlock_irqsave)(&priv->spinlock); in gpio_latch_set()
113 guard(mutex)(&priv->mutex); in gpio_latch_set_can_sleep()
123 if (gpiod_cansleep(priv->clk_gpios->desc[i])) in gpio_latch_can_sleep()
126 for (i = 0; i < priv->n_latched_gpios; i++) in gpio_latch_can_sleep()
127 if (gpiod_cansleep(priv->latched_gpios->desc[i])) in gpio_latch_can_sleep()
143 struct device *dev = &pdev->dev; in gpio_latch_probe()
149 return -ENOMEM; in gpio_latch_probe()
151 priv->clk_gpios = devm_gpiod_get_array(dev, "clk", GPIOD_OUT_LOW); in gpio_latch_probe()
152 if (IS_ERR(priv->clk_gpios)) in gpio_latch_probe()
153 return PTR_ERR(priv->clk_gpios); in gpio_latch_probe()
155 priv->latched_gpios = devm_gpiod_get_array(dev, "latched", GPIOD_OUT_LOW); in gpio_latch_probe()
156 if (IS_ERR(priv->latched_gpios)) in gpio_latch_probe()
157 return PTR_ERR(priv->latched_gpios); in gpio_latch_probe()
159 n_latches = priv->clk_gpios->ndescs; in gpio_latch_probe()
160 priv->n_latched_gpios = priv->latched_gpios->ndescs; in gpio_latch_probe()
162 priv->shadow = devm_bitmap_zalloc(dev, n_latches * priv->n_latched_gpios, in gpio_latch_probe()
164 if (!priv->shadow) in gpio_latch_probe()
165 return -ENOMEM; in gpio_latch_probe()
168 priv->gc.can_sleep = true; in gpio_latch_probe()
169 priv->gc.set_rv = gpio_latch_set_can_sleep; in gpio_latch_probe()
170 mutex_init(&priv->mutex); in gpio_latch_probe()
172 priv->gc.can_sleep = false; in gpio_latch_probe()
173 priv->gc.set_rv = gpio_latch_set; in gpio_latch_probe()
174 spin_lock_init(&priv->spinlock); in gpio_latch_probe()
177 device_property_read_u32(dev, "setup-duration-ns", in gpio_latch_probe()
178 &priv->setup_duration_ns); in gpio_latch_probe()
179 if (priv->setup_duration_ns > DURATION_NS_MAX) { in gpio_latch_probe()
180 dev_warn(dev, "setup-duration-ns too high, limit to %d\n", in gpio_latch_probe()
182 priv->setup_duration_ns = DURATION_NS_MAX; in gpio_latch_probe()
185 device_property_read_u32(dev, "clock-duration-ns", in gpio_latch_probe()
186 &priv->clock_duration_ns); in gpio_latch_probe()
187 if (priv->clock_duration_ns > DURATION_NS_MAX) { in gpio_latch_probe()
188 dev_warn(dev, "clock-duration-ns too high, limit to %d\n", in gpio_latch_probe()
190 priv->clock_duration_ns = DURATION_NS_MAX; in gpio_latch_probe()
193 priv->gc.get_direction = gpio_latch_get_direction; in gpio_latch_probe()
194 priv->gc.ngpio = n_latches * priv->n_latched_gpios; in gpio_latch_probe()
195 priv->gc.owner = THIS_MODULE; in gpio_latch_probe()
196 priv->gc.base = -1; in gpio_latch_probe()
197 priv->gc.parent = dev; in gpio_latch_probe()
201 return devm_gpiochip_add_data(dev, &priv->gc, priv); in gpio_latch_probe()
206 .compatible = "gpio-latch",
214 .name = "gpio-latch",