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