From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8595DC468BD for ; Fri, 7 Jun 2019 17:25:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3ADDF207E0 for ; Fri, 7 Jun 2019 17:25:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=megous.com header.i=@megous.com header.b="M3m+MPBG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731344AbfFGRZ5 (ORCPT ); Fri, 7 Jun 2019 13:25:57 -0400 Received: from vps.xff.cz ([195.181.215.36]:50140 "EHLO vps.xff.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729284AbfFGRZ5 (ORCPT ); Fri, 7 Jun 2019 13:25:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=megous.com; s=mail; t=1559928352; bh=0FXb8HJgWfSUyPEtwZ7hUU3ZIE3r6G7KjfbY6R474Xk=; h=Date:From:To:Subject:References:In-Reply-To:From; b=M3m+MPBGYmoLmFxSyulhXhH4+JwTu2ynqtJNYvAZxvgwuWeaZ/n5lKJ6S+WaHVw6A B3vsRr4ciSL2XlSkhFakfeygqkiZK5l55Iwp5n5I/4iN2QoWOIyn8M0LbLqXyA9AMJ 3MQN9AGrsT3oSiOZC12q6cwsdUUz2VsSxs7cQTFA= Date: Fri, 7 Jun 2019 19:25:52 +0200 From: =?utf-8?Q?Ond=C5=99ej?= Jirman To: Frank Lee , rui.zhang@intel.com, Eduardo Valentin , Daniel Lezcano , robh+dt@kernel.org, Mark Rutland , Maxime Ripard , Chen-Yu Tsai , David Miller , Mauro Carvalho Chehab , Greg Kroah-Hartman , Linus Walleij , Nicolas Ferre , paulmck@linux.ibm.com, devicetree@vger.kernel.org, Linux Kernel Mailing List , Linux ARM , Linux PM Subject: Re: [PATCH v3 1/3] thermal: sun8i: add thermal driver for h6 Message-ID: <20190607172552.4ldtktona5fydv6j@core.my.home> Mail-Followup-To: Frank Lee , rui.zhang@intel.com, Eduardo Valentin , Daniel Lezcano , robh+dt@kernel.org, Mark Rutland , Maxime Ripard , Chen-Yu Tsai , David Miller , Mauro Carvalho Chehab , Greg Kroah-Hartman , Linus Walleij , Nicolas Ferre , paulmck@linux.ibm.com, devicetree@vger.kernel.org, Linux Kernel Mailing List , Linux ARM , Linux PM References: <20190525181329.18657-1-tiny.windzz@gmail.com> <20190525181329.18657-2-tiny.windzz@gmail.com> <20190527142544.skblqfcz5fqfzxgl@core.my.home> <20190607171821.zpb5e6aurdfcflpb@core.my.home> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20190607171821.zpb5e6aurdfcflpb@core.my.home> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Jun 07, 2019 at 07:18:21PM +0200, verejna wrote: > Hello Frank, > > On Fri, Jun 07, 2019 at 09:50:08PM +0800, Frank Lee wrote: > > HI Ondřej, > > > > > > On Mon, May 27, 2019 at 10:25 PM Ondřej Jirman wrote: > > > > > > Hi Yangtao, > > > > > > On Sat, May 25, 2019 at 02:13:27PM -0400, Yangtao Li wrote: > > > > This patch adds the support for allwinner thermal sensor, within > > > > allwinner SoC. It will register sensors for thermal framework > > > > and use device tree to bind cooling device. > > > > > > > > Signed-off-by: Yangtao Li > > > > --- > > > > MAINTAINERS | 7 + > > > > drivers/thermal/Kconfig | 14 + > > > > drivers/thermal/Makefile | 1 + > > > > drivers/thermal/sun8i_thermal.c | 437 ++++++++++++++++++++++++++++++++ > > > > 4 files changed, 459 insertions(+) > > > > create mode 100644 drivers/thermal/sun8i_thermal.c > > > > > > > > diff --git a/MAINTAINERS b/MAINTAINERS > > > > index 2336dd26ece4..d312f9eecf0d 100644 > > > > --- a/MAINTAINERS > > > > +++ b/MAINTAINERS > > > > @@ -674,6 +674,13 @@ L: linux-crypto@vger.kernel.org > > > > S: Maintained > > > > F: drivers/crypto/sunxi-ss/ > > > > > > > > +ALLWINNER THERMAL DRIVER > > > > +M: Yangtao Li > > > > +L: linux-pm@vger.kernel.org > > > > +S: Maintained > > > > +F: Documentation/devicetree/bindings/thermal/sun8i-thermal.yaml > > > > +F: drivers/thermal/sun8i_thermal.c > > > > + > > > > ALLWINNER VPU DRIVER > > > > M: Maxime Ripard > > > > M: Paul Kocialkowski > > > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > > > > index 9966364a6deb..e5465053d66f 100644 > > > > --- a/drivers/thermal/Kconfig > > > > +++ b/drivers/thermal/Kconfig > > > > @@ -262,6 +262,20 @@ config SPEAR_THERMAL > > > > Enable this to plug the SPEAr thermal sensor driver into the Linux > > > > thermal framework. > > > > > > > > +config SUN8I_THERMAL > > > > + tristate "Allwinner sun8i thermal driver" > > > > + depends on ARCH_SUNXI || COMPILE_TEST > > > > + depends on HAS_IOMEM > > > > + depends on NVMEM_SUNXI_SID > > > > + depends on OF > > > > + depends on RESET_CONTROLLER > > > > + help > > > > + Support for the sun8i thermal sensor driver into the Linux thermal > > > > + framework. > > > > + > > > > + To compile this driver as a module, choose M here: the > > > > + module will be called sun8i-thermal. > > > > + > > > > config ROCKCHIP_THERMAL > > > > tristate "Rockchip thermal driver" > > > > depends on ARCH_ROCKCHIP || COMPILE_TEST > > > > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > > > > index 74a37c7f847a..fa6f8b206281 100644 > > > > --- a/drivers/thermal/Makefile > > > > +++ b/drivers/thermal/Makefile > > > > @@ -31,6 +31,7 @@ thermal_sys-$(CONFIG_DEVFREQ_THERMAL) += devfreq_cooling.o > > > > obj-y += broadcom/ > > > > obj-$(CONFIG_THERMAL_MMIO) += thermal_mmio.o > > > > obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o > > > > +obj-$(CONFIG_SUN8I_THERMAL) += sun8i_thermal.o > > > > obj-$(CONFIG_ROCKCHIP_THERMAL) += rockchip_thermal.o > > > > obj-$(CONFIG_RCAR_THERMAL) += rcar_thermal.o > > > > obj-$(CONFIG_RCAR_GEN3_THERMAL) += rcar_gen3_thermal.o > > > > diff --git a/drivers/thermal/sun8i_thermal.c b/drivers/thermal/sun8i_thermal.c > > > > new file mode 100644 > > > > index 000000000000..a9cc2197f4cb > > > > --- /dev/null > > > > +++ b/drivers/thermal/sun8i_thermal.c > > > > @@ -0,0 +1,437 @@ > > > > +// SPDX-License-Identifier: GPL-2.0 > > > > +/* > > > > + * Thermal sensor driver for Allwinner SOC > > > > + * Copyright (C) 2019 Yangtao Li > > > > + * > > > > + * Based on the work of Icenowy Zheng > > > > + * Based on the work of Ondrej Jirman > > > > + * Based on the work of Josef Gajdusek > > > > + */ > > > > + > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > +#include > > > > + > > > > +#define MAX_SENSOR_NUM 4 > > > > + > > > > +#define FT_TEMP_MASK GENMASK(11, 0) > > > > +#define TEMP_CALIB_MASK GENMASK(11, 0) > > > > +#define TEMP_TO_REG 672 > > > > +#define CALIBRATE_DEFAULT 0x800 > > > > + > > > > +#define SUN50I_THS_CTRL0 0x00 > > > > +#define SUN50I_H6_THS_ENABLE 0x04 > > > > +#define SUN50I_H6_THS_PC 0x08 > > > > +#define SUN50I_H6_THS_DIC 0x10 > > > > +#define SUN50I_H6_THS_DIS 0x20 > > > > +#define SUN50I_H6_THS_MFC 0x30 > > > > +#define SUN50I_H6_THS_TEMP_CALIB 0xa0 > > > > +#define SUN50I_H6_THS_TEMP_DATA 0xc0 > > > > + > > > > +#define SUN50I_THS_CTRL0_T_ACQ(x) ((GENMASK(15, 0) & (x)) << 16) > > > > +#define SUN50I_THS_FILTER_EN BIT(2) > > > > +#define SUN50I_THS_FILTER_TYPE(x) (GENMASK(1, 0) & (x)) > > > > +#define SUN50I_H6_THS_PC_TEMP_PERIOD(x) ((GENMASK(19, 0) & (x)) << 12) > > > > +#define SUN50I_H6_THS_DATA_IRQ_STS(x) BIT(x) > > > > + > > > > +/* millidegree celsius */ > > > > +#define SUN50I_H6_FT_DEVIATION 7000 > > > > + > > > > +struct ths_device; > > > > + > > > > +struct tsensor { > > > > + struct ths_device *tmdev; > > > > + struct thermal_zone_device *tzd; > > > > + int id; > > > > + wait_queue_head_t wait_queue; > > > > +}; > > > > + > > > > +struct ths_thermal_chip { > > > > + int sensor_num; > > > > + int offset; > > > > + int scale; > > > > + int ft_deviation; > > > > + int temp_calib_base; > > > > + int temp_data_base; > > > > + int (*calibrate)(struct ths_device *tmdev); > > > > + int (*init)(struct ths_device *tmdev); > > > > + irqreturn_t (*irq_thread)(int irq, void *data); > > > > +}; > > > > + > > > > +struct ths_device { > > > > + const struct ths_thermal_chip *chip; > > > > + struct device *dev; > > > > + struct regmap *regmap; > > > > + struct reset_control *reset; > > > > + struct clk *bus_clk; > > > > + struct tsensor sensor[MAX_SENSOR_NUM]; > > > > + int data_ready; > > > > +}; > > > > + > > > > +/* Temp Unit: millidegree Celsius */ > > > > +static int sun8i_ths_reg2temp(struct ths_device *tmdev, > > > > + int reg) > > > > +{ > > > > + return (reg + tmdev->chip->offset) * tmdev->chip->scale; > > > > +} > > > > + > > > > +static int sun8i_ths_get_temp(void *data, int *temp) > > > > +{ > > > > + struct tsensor *s = data; > > > > + struct ths_device *tmdev = s->tmdev; > > > > + int val; > > > > + > > > > + wait_event(s->wait_queue, tmdev->data_ready & BIT(s->id)); > > > > + tmdev->data_ready &= ~BIT(s->id); > > > > > > I've looked at thermal_core.c and it looks like that the proper way to handle > > > this situation is just returning -EAGAIN. > > > > What we are doing now is to turn it into an interrupt-based program. > > Every time we use temperature data, we need to wait until new data is collected. > > No you don't need to wait, and by waiting you're blocking a lot of tings in > thermal_core.c for no reason. > > > > > > > See update_temperature() function in thermal_core.c. > > > > > > That will suppress the warning about failure to read thermal zone. Also > > > it's much simpler than this wait_queue stuff. No other thermal driver uses this > > > either. Also get_temp is called under thermal_list_lock mutex and that would > > > block cooling device registrations and god knows what else. > > > > Since there is no valid temperature data, it cannot be blocked. > > Sorry, I don't understand your meaning here. get_temp will block in > wait_event, and the above mentioned lock in tz code will be held during all this > time, until you get data_ready condition satisified sometimes in the future. > > https://elixir.bootlin.com/linux/latest/source/drivers/thermal/thermal_core.c#L43 > > This will prevent all time zones in the system from being updated, regsitered, > etc, because it's a driver level lock. > > Given that this is called from __thermal_cooling_device_register: > > https://elixir.bootlin.com/linux/latest/source/drivers/thermal/thermal_core.c#L997 Other effect I guess, since this is a driver registration function is that this will end up blocking boot on the thermal_list_lock if you have more than 1 cooling device until you get the first sample, which is not really acceptable. regards, o. > This will stop all other thermal zones from registering for no reason. > > Just return -EAGAIN, as expected here: > > https://elixir.bootlin.com/linux/latest/source/drivers/thermal/thermal_core.c#L431 > > And the driver will work in both interrupt driven and polled mode just fine, > without any warnings or delays or taking this lock for no reason for too long. > > thank you and regards, > o. > > > MBR, > > Yangtao > > > > > > > > Other than that, and what Maxime said, I don't see any more issues. > > > > > > thank you, > > > o. > > > > > > > + regmap_read(tmdev->regmap, tmdev->chip->temp_data_base + > > > > + 0x4 * s->id, &val); > > > > + > > > > + *temp = sun8i_ths_reg2temp(tmdev, val); > > > > + /* > > > > + * XX - According to the original sdk, there are some platforms(rarely) > > > > + * that add a fixed offset value after calculating the temperature > > > > + * value. We can't simply put it on the formula for calculating the > > > > + * temperature above, because the formula for calculating the > > > > + * temperature above is also used when the sensor is calibrated. If > > > > + * do this, the correct calibration formula is hard to know. > > > > + */ > > > > + if (tmdev->chip->ft_deviation) > > > > + *temp += tmdev->chip->ft_deviation; > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static const struct thermal_zone_of_device_ops ths_ops = { > > > > + .get_temp = sun8i_ths_get_temp, > > > > +}; > > > > + > > > > +static const struct regmap_config config = { > > > > + .reg_bits = 32, > > > > + .val_bits = 32, > > > > + .reg_stride = 4, > > > > + .fast_io = true, > > > > +}; > > > > + > > > > +static irqreturn_t sun50i_h6_irq_thread(int irq, void *data) > > > > +{ > > > > + wait_queue_head_t *data_wait; > > > > + struct ths_device *tmdev = data; > > > > + int i, state; > > > > + > > > > + regmap_read(tmdev->regmap, SUN50I_H6_THS_DIS, &state); > > > > + > > > > + for (i = 0; i < tmdev->chip->sensor_num; i++) { > > > > + data_wait = &tmdev->sensor[i].wait_queue; > > > > + > > > > + if (state & SUN50I_H6_THS_DATA_IRQ_STS(i)) { > > > > + /* clear data irq pending */ > > > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIS, > > > > + SUN50I_H6_THS_DATA_IRQ_STS(i)); > > > > + > > > > + tmdev->data_ready |= BIT(i); > > > > + wake_up(data_wait); > > > > + } > > > > + } > > > > + > > > > + return IRQ_HANDLED; > > > > +} > > > > + > > > > +static int sun8i_ths_resource_init(struct ths_device *tmdev) > > > > +{ > > > > + struct device *dev = tmdev->dev; > > > > + struct platform_device *pdev = to_platform_device(dev); > > > > + struct resource *mem; > > > > + void __iomem *base; > > > > + int ret, irq; > > > > + > > > > + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > > > + base = devm_ioremap_resource(dev, mem); > > > > + if (IS_ERR(base)) > > > > + return PTR_ERR(base); > > > > + > > > > + tmdev->regmap = devm_regmap_init_mmio(dev, base, &config); > > > > + if (IS_ERR(tmdev->regmap)) > > > > + return PTR_ERR(tmdev->regmap); > > > > + > > > > + tmdev->reset = devm_reset_control_get(dev, 0); > > > > + if (IS_ERR(tmdev->reset)) > > > > + return PTR_ERR(tmdev->reset); > > > > + > > > > + tmdev->bus_clk = devm_clk_get(&pdev->dev, "bus"); > > > > + if (IS_ERR(tmdev->bus_clk)) > > > > + return PTR_ERR(tmdev->bus_clk); > > > > + > > > > + irq = platform_get_irq(pdev, 0); > > > > + if (irq < 0) > > > > + return irq; > > > > + > > > > + ret = devm_request_threaded_irq(dev, irq, NULL, > > > > + tmdev->chip->irq_thread, > > > > + IRQF_ONESHOT, "ths", tmdev); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + ret = reset_control_deassert(tmdev->reset); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + ret = clk_prepare_enable(tmdev->bus_clk); > > > > + if (ret) > > > > + goto assert_reset; > > > > + > > > > + ret = tmdev->chip->calibrate(tmdev); > > > > + if (ret) > > > > + goto bus_disable; > > > > + > > > > + return 0; > > > > + > > > > +bus_disable: > > > > + clk_disable_unprepare(tmdev->bus_clk); > > > > +assert_reset: > > > > + reset_control_assert(tmdev->reset); > > > > + > > > > + return ret; > > > > +} > > > > + > > > > +static int sun50i_ths_calibrate(struct ths_device *tmdev) > > > > +{ > > > > + struct nvmem_cell *calcell; > > > > + struct device *dev = tmdev->dev; > > > > + u16 *caldata; > > > > + size_t callen; > > > > + int ft_temp; > > > > + int i, ret = 0; > > > > + > > > > + calcell = devm_nvmem_cell_get(dev, "calib"); > > > > + if (IS_ERR(calcell)) { > > > > + if (PTR_ERR(calcell) == -EPROBE_DEFER) > > > > + return -EPROBE_DEFER; > > > > + /* > > > > + * Even if the external calibration data stored in sid is > > > > + * not accessible, the THS hardware can still work, although > > > > + * the data won't be so accurate. > > > > + * > > > > + * The default value of calibration register is 0x800 for > > > > + * every sensor, and the calibration value is usually 0x7xx > > > > + * or 0x8xx, so they won't be away from the default value > > > > + * for a lot. > > > > + * > > > > + * So here we do not return error if the calibartion data is > > > > + * not available, except the probe needs deferring. > > > > + */ > > > > + goto out; > > > > + } > > > > + > > > > + caldata = nvmem_cell_read(calcell, &callen); > > > > + if (IS_ERR(caldata)) { > > > > + ret = PTR_ERR(caldata); > > > > + goto out; > > > > + } > > > > + > > > > + if (!caldata[0] || callen < 2 + 2 * tmdev->chip->sensor_num) { > > > > + ret = -EINVAL; > > > > + goto out_free; > > > > + } > > > > + > > > > + /* > > > > + * efuse layout: > > > > + * > > > > + * 0 11 16 32 > > > > + * +-------+-------+-------+ > > > > + * |temp| |sensor0|sensor1| > > > > + * +-------+-------+-------+ > > > > + * > > > > + * The calibration data on the H6 is the ambient temperature and > > > > + * sensor values that are filled during the factory test stage. > > > > + * > > > > + * The unit of stored FT temperature is 0.1 degreee celusis. > > > > + * Through the stored ambient temperature and the data read > > > > + * by the sensor, after a certain calculation, the calibration > > > > + * value to be compensated can be obtained. > > > > + */ > > > > + ft_temp = caldata[0] & FT_TEMP_MASK; > > > > + > > > > + for (i = 0; i < tmdev->chip->sensor_num; i++) { > > > > + int reg = (int)caldata[i + 1]; > > > > + int sensor_temp = sun8i_ths_reg2temp(tmdev, reg); > > > > + int delta, cdata, calib_offest; > > > > + > > > > + /* > > > > + * To calculate the calibration value: > > > > + * > > > > + * X(in Celsius) = Ts - ft_temp > > > > + * delta = X * 10000 / TEMP_TO_REG > > > > + * cdata = CALIBRATE_DEFAULT - delta > > > > + * > > > > + * cdata: calibration value > > > > + */ > > > > + delta = (sensor_temp - ft_temp * 100) * 10 / TEMP_TO_REG; > > > > + cdata = CALIBRATE_DEFAULT - delta; > > > > + if (cdata & ~TEMP_CALIB_MASK) { > > > > + /* > > > > + * Calibration value more than 12-bit, but calibration > > > > + * register is 12-bit. In this case, ths hardware can > > > > + * still work without calibration, although the data > > > > + * won't be so accurate. > > > > + */ > > > > + dev_warn(dev, "sensor%d is not calibrated.\n", i); > > > > + > > > > + continue; > > > > + } > > > > + > > > > + calib_offest = tmdev->chip->temp_calib_base + (i / 2) * 0x4; > > > > + > > > > + if (i % 2) { > > > > + int val; > > > > + > > > > + regmap_read(tmdev->regmap, calib_offest, &val); > > > > + val = (val & TEMP_CALIB_MASK) | (cdata << 16); > > > > + regmap_write(tmdev->regmap, calib_offest, val); > > > > + } else { > > > > + regmap_write(tmdev->regmap, calib_offest, cdata); > > > > + } > > > > + } > > > > + > > > > +out_free: > > > > + kfree(caldata); > > > > +out: > > > > + return ret; > > > > +} > > > > + > > > > +static int sun8i_ths_register(struct ths_device *tmdev) > > > > +{ > > > > + struct thermal_zone_device *tzd; > > > > + int i; > > > > + > > > > + for (i = 0; i < tmdev->chip->sensor_num; i++) { > > > > + tmdev->sensor[i].tmdev = tmdev; > > > > + tmdev->sensor[i].id = i; > > > > + tmdev->sensor[i].tzd = > > > > + devm_thermal_zone_of_sensor_register(tmdev->dev, > > > > + i, > > > > + &tmdev->sensor[i], > > > > + &ths_ops); > > > > + if (IS_ERR(tmdev->sensor[i].tzd)) > > > > + return PTR_ERR(tzd); > > > > + } > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static int sun8i_ths_probe(struct platform_device *pdev) > > > > +{ > > > > + struct ths_device *tmdev; > > > > + struct device *dev = &pdev->dev; > > > > + int i, ret; > > > > + > > > > + tmdev = devm_kzalloc(dev, sizeof(*tmdev), GFP_KERNEL); > > > > + if (!tmdev) > > > > + return -ENOMEM; > > > > + > > > > + tmdev->dev = dev; > > > > + tmdev->chip = of_device_get_match_data(&pdev->dev); > > > > + if (!tmdev->chip) > > > > + return -EINVAL; > > > > + > > > > + /* > > > > + * Initialize wait_queue in advance, to avoid calling wake_up > > > > + * before ths is registered in isr. > > > > + */ > > > > + for (i = 0; i < tmdev->chip->sensor_num; i++) > > > > + init_waitqueue_head(&tmdev->sensor[i].wait_queue); > > > > + > > > > + platform_set_drvdata(pdev, tmdev); > > > > + > > > > + ret = sun8i_ths_resource_init(tmdev); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + ret = tmdev->chip->init(tmdev); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + ret = sun8i_ths_register(tmdev); > > > > + if (ret) > > > > + return ret; > > > > + > > > > + return ret; > > > > +} > > > > + > > > > +static int sun8i_ths_remove(struct platform_device *pdev) > > > > +{ > > > > + struct ths_device *tmdev = platform_get_drvdata(pdev); > > > > + > > > > + clk_disable_unprepare(tmdev->bus_clk); > > > > + reset_control_assert(tmdev->reset); > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static int sun50i_thermal_init(struct ths_device *tmdev) > > > > +{ > > > > + int val; > > > > + > > > > + /* > > > > + * clkin = 24MHz > > > > + * T acquire = clkin / (x + 1) > > > > + * = 20us > > > > + */ > > > > + regmap_write(tmdev->regmap, SUN50I_THS_CTRL0, > > > > + SUN50I_THS_CTRL0_T_ACQ(479)); > > > > + /* average over 4 samples */ > > > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_MFC, > > > > + SUN50I_THS_FILTER_EN | > > > > + SUN50I_THS_FILTER_TYPE(1)); > > > > + /* period = (x + 1) * 4096 / clkin; ~10ms */ > > > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_PC, > > > > + SUN50I_H6_THS_PC_TEMP_PERIOD(58)); > > > > + /* enable sensor */ > > > > + val = GENMASK(tmdev->chip->sensor_num - 1, 0); > > > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_ENABLE, val); > > > > + /* thermal data interrupt enable */ > > > > + val = GENMASK(tmdev->chip->sensor_num - 1, 0); > > > > + regmap_write(tmdev->regmap, SUN50I_H6_THS_DIC, val); > > > > + > > > > + return 0; > > > > +} > > > > + > > > > +static const struct ths_thermal_chip sun50i_h6_ths = { > > > > + .sensor_num = 2, > > > > + .offset = -2794, > > > > + .scale = -67, > > > > + .ft_deviation = SUN50I_H6_FT_DEVIATION, > > > > + .temp_calib_base = SUN50I_H6_THS_TEMP_CALIB, > > > > + .temp_data_base = SUN50I_H6_THS_TEMP_DATA, > > > > + .calibrate = sun50i_ths_calibrate, > > > > + .init = sun50i_thermal_init, > > > > + .irq_thread = sun50i_h6_irq_thread, > > > > +}; > > > > + > > > > +static const struct of_device_id of_ths_match[] = { > > > > + { .compatible = "allwinner,sun50i-h6-ths", .data = &sun50i_h6_ths }, > > > > + { /* sentinel */ }, > > > > +}; > > > > +MODULE_DEVICE_TABLE(of, of_ths_match); > > > > + > > > > +static struct platform_driver ths_driver = { > > > > + .probe = sun8i_ths_probe, > > > > + .remove = sun8i_ths_remove, > > > > + .driver = { > > > > + .name = "sun8i-thermal", > > > > + .of_match_table = of_ths_match, > > > > + }, > > > > +}; > > > > +module_platform_driver(ths_driver); > > > > + > > > > +MODULE_DESCRIPTION("Thermal sensor driver for Allwinner SOC"); > > > > +MODULE_LICENSE("GPL v2"); > > > > -- > > > > 2.17.0 > > > > > > > > > > > > _______________________________________________ > > > > linux-arm-kernel mailing list > > > > linux-arm-kernel@lists.infradead.org > > > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > > > _______________________________________________ > > linux-arm-kernel mailing list > > linux-arm-kernel@lists.infradead.org > > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel