214 lines
5.7 KiB
C
214 lines
5.7 KiB
C
/*
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* imx_thermal
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*
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* Copyright (c) 2015 Zodiac Inflight Innovation
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* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
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*
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* based on the code of analogous driver from U-Boot:
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* (C) Copyright 2014-2015 Freescale Semiconductor, Inc.
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* Author: Nitin Garg <nitin.garg@freescale.com>
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* Ye Li <Ye.Li@freescale.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <common.h>
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#include <init.h>
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#include <malloc.h>
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#include <clock.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/math64.h>
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#include <linux/log2.h>
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#include <linux/clk.h>
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#include <mach/imx6-anadig.h>
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#include <io.h>
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#include <aiodev.h>
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#include <mfd/syscon.h>
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#define FACTOR0 10000000
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#define MEASURE_FREQ 327
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#define OCOTP_ANA1_OFFSET (0xE * sizeof(uint32_t))
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struct imx_thermal_data {
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int c1, c2;
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void __iomem *base;
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struct clk *clk;
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struct aiodevice aiodev;
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struct aiochannel aiochan;
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};
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static inline struct imx_thermal_data *
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to_imx_thermal_data(struct aiochannel *chan)
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{
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return container_of(chan, struct imx_thermal_data, aiochan);
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}
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static int imx_thermal_read(struct aiochannel *chan, int *val)
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{
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uint64_t start;
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uint32_t tempsense0, tempsense1;
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uint16_t n_meas;
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struct imx_thermal_data *imx_thermal = to_imx_thermal_data(chan);
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/*
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* now we only use single measure, every time we read
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* the temperature, we will power on/down anadig thermal
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* module
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*/
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writel(BM_ANADIG_TEMPSENSE0_POWER_DOWN,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
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writel(BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF,
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imx_thermal->base + HW_ANADIG_ANA_MISC0_SET);
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/* setup measure freq */
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tempsense1 = readl(imx_thermal->base + HW_ANADIG_TEMPSENSE1);
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tempsense1 &= ~BM_ANADIG_TEMPSENSE1_MEASURE_FREQ;
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tempsense1 |= MEASURE_FREQ;
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writel(tempsense1, imx_thermal->base + HW_ANADIG_TEMPSENSE1);
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/* start the measurement process */
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writel(BM_ANADIG_TEMPSENSE0_MEASURE_TEMP,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
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writel(BM_ANADIG_TEMPSENSE0_FINISHED,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
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writel(BM_ANADIG_TEMPSENSE0_MEASURE_TEMP,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_SET);
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/* make sure that the latest temp is valid */
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start = get_time_ns();
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do {
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tempsense0 = readl(imx_thermal->base + HW_ANADIG_TEMPSENSE0);
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if (is_timeout(start, 1 * SECOND)) {
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dev_err(imx_thermal->aiodev.hwdev,
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"Timeout waiting for measurement\n");
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return -EIO;
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}
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} while (!(tempsense0 & BM_ANADIG_TEMPSENSE0_FINISHED));
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n_meas = (tempsense0 & BM_ANADIG_TEMPSENSE0_TEMP_VALUE)
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>> BP_ANADIG_TEMPSENSE0_TEMP_VALUE;
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writel(BM_ANADIG_TEMPSENSE0_FINISHED,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_CLR);
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*val = (int)n_meas * imx_thermal->c1 + imx_thermal->c2;
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/* power down anatop thermal sensor */
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writel(BM_ANADIG_TEMPSENSE0_POWER_DOWN,
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imx_thermal->base + HW_ANADIG_TEMPSENSE0_SET);
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writel(BM_ANADIG_ANA_MISC0_REFTOP_SELBIASOFF,
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imx_thermal->base + HW_ANADIG_ANA_MISC0_CLR);
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return 0;
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}
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static int imx_thermal_probe(struct device_d *dev)
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{
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uint32_t ocotp_ana1;
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struct device_node *node;
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struct imx_thermal_data *imx_thermal;
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struct cdev *ocotp;
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int t1, n1, t2, n2;
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int ret;
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node = of_parse_phandle(dev->device_node, "fsl,tempmon-data", 0);
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if (!node) {
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dev_err(dev, "No calibration data source\n");
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return -ENODEV;
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}
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ocotp = cdev_by_device_node(node);
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if (!ocotp) {
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dev_err(dev, "No OCOTP character device\n");
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return -ENODEV;
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}
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ret = cdev_read(ocotp, &ocotp_ana1, sizeof(ocotp_ana1),
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OCOTP_ANA1_OFFSET, 0);
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if (ret != sizeof(ocotp_ana1)) {
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dev_err(dev, "Failed to read calibration data\n");
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return ret < 0 ? ret : -EIO;
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}
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imx_thermal = xzalloc(sizeof(*imx_thermal));
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imx_thermal->base = syscon_base_lookup_by_phandle(dev->device_node,
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"fsl,tempmon");
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if (IS_ERR(imx_thermal->base)) {
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dev_err(dev, "Could not get ANATOP address\n");
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ret = PTR_ERR(imx_thermal->base);
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goto free_imx_thermal;
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}
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n1 = ocotp_ana1 >> 20;
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t1 = 25;
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n2 = (ocotp_ana1 & 0x000FFF00) >> 8;
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t2 = ocotp_ana1 & 0xFF;
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imx_thermal->c1 = (-1000 * (t2 - t1)) / (n1 - n2);
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imx_thermal->c2 = 1000 * t2 + (1000 * n2 * (t2 - t1)) / (n1 - n2);
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imx_thermal->clk = clk_get(dev, NULL);
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if (IS_ERR(imx_thermal->clk)) {
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ret = PTR_ERR(imx_thermal->clk);
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goto free_imx_thermal;
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}
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ret = clk_enable(imx_thermal->clk);
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if (ret) {
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dev_err(dev, "Failed to enable clock: %s\n",
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strerror(ret));
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goto put_clock;
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}
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imx_thermal->aiodev.num_channels = 1;
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imx_thermal->aiodev.hwdev = dev;
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imx_thermal->aiodev.channels =
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xmalloc(imx_thermal->aiodev.num_channels *
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sizeof(imx_thermal->aiodev.channels[0]));
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imx_thermal->aiodev.channels[0] = &imx_thermal->aiochan;
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imx_thermal->aiochan.unit = "mC";
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imx_thermal->aiodev.read = imx_thermal_read;
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ret = aiodevice_register(&imx_thermal->aiodev);
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if (!ret)
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goto done;
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clk_disable(imx_thermal->clk);
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put_clock:
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clk_put(imx_thermal->clk);
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free_imx_thermal:
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kfree(imx_thermal);
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done:
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return ret;
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}
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static const struct of_device_id of_imx_thermal_match[] = {
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{ .compatible = "fsl,imx6q-tempmon", },
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{ .compatible = "fsl,imx6sx-tempmon", },
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{ /* end */ }
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};
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static struct driver_d imx_thermal_driver = {
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.name = "imx_thermal",
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.probe = imx_thermal_probe,
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.of_compatible = DRV_OF_COMPAT(of_imx_thermal_match),
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};
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device_platform_driver(imx_thermal_driver);
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