1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2015 Google, Inc 4 * Written by Simon Glass <sjg@chromium.org> 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <pwm.h> 11 #include <asm/test.h> 12 13 enum { 14 NUM_CHANNELS = 3, 15 }; 16 17 struct sandbox_pwm_chan { 18 uint period_ns; 19 uint duty_ns; 20 bool enable; 21 bool polarity; 22 }; 23 24 struct sandbox_pwm_priv { 25 struct sandbox_pwm_chan chan[NUM_CHANNELS]; 26 }; 27 28 static int sandbox_pwm_set_config(struct udevice *dev, uint channel, 29 uint period_ns, uint duty_ns) 30 { 31 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 32 struct sandbox_pwm_chan *chan; 33 34 if (channel >= NUM_CHANNELS) 35 return -ENOSPC; 36 chan = &priv->chan[channel]; 37 chan->period_ns = period_ns; 38 chan->duty_ns = duty_ns; 39 40 return 0; 41 } 42 43 static int sandbox_pwm_set_enable(struct udevice *dev, uint channel, 44 bool enable) 45 { 46 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 47 struct sandbox_pwm_chan *chan; 48 49 if (channel >= NUM_CHANNELS) 50 return -ENOSPC; 51 chan = &priv->chan[channel]; 52 chan->enable = enable; 53 54 return 0; 55 } 56 57 static int sandbox_pwm_set_invert(struct udevice *dev, uint channel, 58 bool polarity) 59 { 60 struct sandbox_pwm_priv *priv = dev_get_priv(dev); 61 struct sandbox_pwm_chan *chan; 62 63 if (channel >= NUM_CHANNELS) 64 return -ENOSPC; 65 chan = &priv->chan[channel]; 66 chan->polarity = polarity; 67 68 return 0; 69 } 70 71 static const struct pwm_ops sandbox_pwm_ops = { 72 .set_config = sandbox_pwm_set_config, 73 .set_enable = sandbox_pwm_set_enable, 74 .set_invert = sandbox_pwm_set_invert, 75 }; 76 77 static const struct udevice_id sandbox_pwm_ids[] = { 78 { .compatible = "sandbox,pwm" }, 79 { } 80 }; 81 82 U_BOOT_DRIVER(warm_pwm_sandbox) = { 83 .name = "pwm_sandbox", 84 .id = UCLASS_PWM, 85 .of_match = sandbox_pwm_ids, 86 .ops = &sandbox_pwm_ops, 87 .priv_auto_alloc_size = sizeof(struct sandbox_pwm_priv), 88 }; 89