From mboxrd@z Thu Jan 1 00:00:00 1970 From: Faiz Abbas Date: Mon, 13 Nov 2017 11:53:35 +0530 Subject: [U-Boot] [PATCH v4 1/3] thermal: ti-bandgap: Add support for temperature sensor In-Reply-To: <1508745487-12793-2-git-send-email-faiz_abbas@ti.com> References: <1508745487-12793-1-git-send-email-faiz_abbas@ti.com> <1508745487-12793-2-git-send-email-faiz_abbas@ti.com> Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de Hi On Monday 23 October 2017 01:28 PM, Faiz Abbas wrote: > The dra7xx series of SOCs contain a temperature sensor and an > associated analog-to-digital converter (ADC) which produces > an output which is proportional to the SOC temperature. > Add support for this temperature sensor. > > Signed-off-by: Faiz Abbas > Reviewed-by: Simon Glass > --- > > v3: > Added Reviewed-by comment > > v2: > 1. Removed extra elements from ti_bandgap > 2. Changed base address to ulong > 3. Changed to udev to dev to maintain consistency > 4. minor format changes > > common/spl/Kconfig | 8 + > .../thermal/ti_soc_thermal.txt | 35 ++++ > drivers/Makefile | 2 +- > drivers/thermal/Kconfig | 6 + > drivers/thermal/Makefile | 1 + > drivers/thermal/ti-bandgap.c | 197 +++++++++++++++++++++ > 6 files changed, 248 insertions(+), 1 deletion(-) > create mode 100644 doc/device-tree-bindings/thermal/ti_soc_thermal.txt > create mode 100644 drivers/thermal/ti-bandgap.c > > diff --git a/common/spl/Kconfig b/common/spl/Kconfig > index 0bd8370..0bf3ee3 100644 > --- a/common/spl/Kconfig > +++ b/common/spl/Kconfig > @@ -604,6 +604,14 @@ config SPL_SPI_SUPPORT > enable SPI drivers that are needed for other purposes also, such > as a SPI PMIC. > > +config SPL_THERMAL > + bool "Driver support for thermal devices" > + help > + Enable support for temperature-sensing devices. Some SoCs have on-chip > + temperature sensors to permit warnings, speed throttling or even > + automatic power-off when the temperature gets too high or low. Other > + devices may be discrete but connected on a suitable bus. > + > config SPL_USB_HOST_SUPPORT > bool "Support USB host drivers" > help > diff --git a/doc/device-tree-bindings/thermal/ti_soc_thermal.txt b/doc/device-tree-bindings/thermal/ti_soc_thermal.txt > new file mode 100644 > index 0000000..b4e88c2 > --- /dev/null > +++ b/doc/device-tree-bindings/thermal/ti_soc_thermal.txt > @@ -0,0 +1,35 @@ > +* Texas Instrument dra7xx SCM bandgap bindings > + > +In the System Control Module, SoC supplies a voltage reference > +and a temperature sensor feature that are gathered in the band > +gap voltage and temperature sensor (VBGAPTS) module. The band > +gap provides current and voltage reference for its internal > +circuits and other analog IP blocks. The analog-to-digital > +converter (ADC) produces an output value that is proportional > +to the silicon temperature. > + > +Required properties: > +- compatible : Should be: > + - "ti,dra752-bandgap" > +- interrupts : this entry should indicate which interrupt line > +the talert signal is routed to; > +- regs : this is specific to each bandgap version, because > +the mapping may change from soc to soc, apart from depending > +on available features. > + > +Optional: > +- gpios : this entry should be used to inform which GPIO > +line the tshut signal is routed to. The informed GPIO will > +be treated as an IRQ; > + > +Example: > +bandgap { > + reg = <0x4a0021e0 0xc > + 0x4a00232c 0xc > + 0x4a002380 0x2c > + 0x4a0023C0 0x3c > + 0x4a002564 0x8 > + 0x4a002574 0x50>; > + compatible = "ti,dra752-bandgap"; > + interrupts = <0 126 4>; /* talert */ > +}; > diff --git a/drivers/Makefile b/drivers/Makefile > index dab5c18..35510ca 100644 > --- a/drivers/Makefile > +++ b/drivers/Makefile > @@ -50,7 +50,7 @@ obj-$(CONFIG_SPL_SATA_SUPPORT) += ata/ scsi/ > obj-$(CONFIG_SPL_USB_HOST_SUPPORT) += block/ > obj-$(CONFIG_SPL_MMC_SUPPORT) += block/ > obj-$(CONFIG_SPL_FPGA_SUPPORT) += fpga/ > - > +obj-$(CONFIG_SPL_THERMAL) += thermal/ > endif > endif > > diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig > index 886f5fa..a71b9be 100644 > --- a/drivers/thermal/Kconfig > +++ b/drivers/thermal/Kconfig > @@ -17,4 +17,10 @@ config IMX_THERMAL > cpufreq is used as the cooling device to throttle CPUs when the > passive trip is crossed. > > +config TI_DRA7_THERMAL > + bool "Temperature sensor driver for TI dra7xx SOCs" > + help > + Enable thermal support for for the Texas Instruments DRA752 SoC family. > + The driver supports reading CPU temperature. > + > endif # if DM_THERMAL > diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile > index d768f5e..f6271a5 100644 > --- a/drivers/thermal/Makefile > +++ b/drivers/thermal/Makefile > @@ -7,3 +7,4 @@ > > obj-$(CONFIG_DM_THERMAL) += thermal-uclass.o > obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o > +obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o > diff --git a/drivers/thermal/ti-bandgap.c b/drivers/thermal/ti-bandgap.c > new file mode 100644 > index 0000000..6db9f54 > --- /dev/null > +++ b/drivers/thermal/ti-bandgap.c > @@ -0,0 +1,197 @@ > +/* > + * TI Bandgap temperature sensor driver > + * > + * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/ > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License as > + * published by the Free Software Foundation version 2. > + * > + * This program is distributed "as is" WITHOUT ANY WARRANTY of any > + * kind, whether express or implied; without even the implied warranty > + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * Taken from Linux v4.9 (drivers/thermal/ti-soc-thermal/ti-bandgap.c) > + * and ported to uboot. > + * > + */ > + > +#include > +#include > +#include > + > +#define CTRL_CORE_TEMP_SENSOR_MPU 0 > +#define DRA752_ADC_START_VALUE 540 > + > +struct ti_bandgap { > + ulong base; > + int temperature; /* in mili degree celsius */ > +}; > + > +/* > + * DRA752 : Temperature values in milli degree celsius > + * ADC code values from 540 to 945 > + */ > +static int dra752_adc_to_temp[] = { > + /* Index 540 - 549 */ > + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, > + -37800, > + /* Index 550 - 559 */ > + -37400, -37000, -36600, -36200, -35800, -35300, -34700, -34200, -33800, > + -33400, > + /* Index 560 - 569 */ > + -33000, -32600, -32200, -31800, -31400, -31000, -30600, -30200, -29800, > + -29400, > + /* Index 570 - 579 */ > + -29000, -28600, -28200, -27700, -27100, -26600, -26200, -25800, -25400, > + -25000, > + /* Index 580 - 589 */ > + -24600, -24200, -23800, -23400, -23000, -22600, -22200, -21800, -21400, > + -21000, > + /* Index 590 - 599 */ > + -20500, -19900, -19400, -19000, -18600, -18200, -17800, -17400, -17000, > + -16600, > + /* Index 600 - 609 */ > + -16200, -15800, -15400, -15000, -14600, -14200, -13800, -13400, -13000, > + -12500, > + /* Index 610 - 619 */ > + -11900, -11400, -11000, -10600, -10200, -9800, -9400, -9000, -8600, > + -8200, > + /* Index 620 - 629 */ > + -7800, -7400, -7000, -6600, -6200, -5800, -5400, -5000, -4500, > + -3900, > + /* Index 630 - 639 */ > + -3400, -3000, -2600, -2200, -1800, -1400, -1000, -600, -200, > + 200, > + /* Index 640 - 649 */ > + 600, 1000, 1400, 1800, 2200, 2600, 3000, 3400, 3900, > + 4500, > + /* Index 650 - 659 */ > + 5000, 5400, 5800, 6200, 6600, 7000, 7400, 7800, 8200, > + 8600, > + /* Index 660 - 669 */ > + 9000, 9400, 9800, 10200, 10600, 11000, 11400, 11800, 12200, > + 12700, > + /* Index 670 - 679 */ > + 13300, 13800, 14200, 14600, 15000, 15400, 15800, 16200, 16600, > + 17000, > + /* Index 680 - 689 */ > + 17400, 17800, 18200, 18600, 19000, 19400, 19800, 20200, 20600, > + 21000, > + /* Index 690 - 699 */ > + 21400, 21900, 22500, 23000, 23400, 23800, 24200, 24600, 25000, > + 25400, > + /* Index 700 - 709 */ > + 25800, 26200, 26600, 27000, 27400, 27800, 28200, 28600, 29000, > + 29400, > + /* Index 710 - 719 */ > + 29800, 30200, 30600, 31000, 31400, 31900, 32500, 33000, 33400, > + 33800, > + /* Index 720 - 729 */ > + 34200, 34600, 35000, 35400, 35800, 36200, 36600, 37000, 37400, > + 37800, > + /* Index 730 - 739 */ > + 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41000, 41400, > + 41800, > + /* Index 740 - 749 */ > + 42200, 42600, 43100, 43700, 44200, 44600, 45000, 45400, 45800, > + 46200, > + /* Index 750 - 759 */ > + 46600, 47000, 47400, 47800, 48200, 48600, 49000, 49400, 49800, > + 50200, > + /* Index 760 - 769 */ > + 50600, 51000, 51400, 51800, 52200, 52600, 53000, 53400, 53800, > + 54200, > + /* Index 770 - 779 */ > + 54600, 55000, 55400, 55900, 56500, 57000, 57400, 57800, 58200, > + 58600, > + /* Index 780 - 789 */ > + 59000, 59400, 59800, 60200, 60600, 61000, 61400, 61800, 62200, > + 62600, > + /* Index 790 - 799 */ > + 63000, 63400, 63800, 64200, 64600, 65000, 65400, 65800, 66200, > + 66600, > + /* Index 800 - 809 */ > + 67000, 67400, 67800, 68200, 68600, 69000, 69400, 69800, 70200, > + 70600, > + /* Index 810 - 819 */ > + 71000, 71500, 72100, 72600, 73000, 73400, 73800, 74200, 74600, > + 75000, > + /* Index 820 - 829 */ > + 75400, 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, > + 79000, > + /* Index 830 - 839 */ > + 79400, 79800, 80200, 80600, 81000, 81400, 81800, 82200, 82600, > + 83000, > + /* Index 840 - 849 */ > + 83400, 83800, 84200, 84600, 85000, 85400, 85800, 86200, 86600, > + 87000, > + /* Index 850 - 859 */ > + 87400, 87800, 88200, 88600, 89000, 89400, 89800, 90200, 90600, > + 91000, > + /* Index 860 - 869 */ > + 91400, 91800, 92200, 92600, 93000, 93400, 93800, 94200, 94600, > + 95000, > + /* Index 870 - 879 */ > + 95400, 95800, 96200, 96600, 97000, 97500, 98100, 98600, 99000, > + 99400, > + /* Index 880 - 889 */ > + 99800, 100200, 100600, 101000, 101400, 101800, 102200, 102600, 103000, > + 103400, > + /* Index 890 - 899 */ > + 103800, 104200, 104600, 105000, 105400, 105800, 106200, 106600, 107000, > + 107400, > + /* Index 900 - 909 */ > + 107800, 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, > + 111400, > + /* Index 910 - 919 */ > + 111800, 112200, 112600, 113000, 113400, 113800, 114200, 114600, 115000, > + 115400, > + /* Index 920 - 929 */ > + 115800, 116200, 116600, 117000, 117400, 117800, 118200, 118600, 119000, > + 119400, > + /* Index 930 - 939 */ > + 119800, 120200, 120600, 121000, 121400, 121800, 122200, 122600, 123000, > + 123400, > + /* Index 940 - 945 */ > + 123800, 124200, 124600, 124900, 125000, 125000, > +}; > + > +static int ti_bandgap_get_temp(struct udevice *dev, int *temp) > +{ > + struct ti_bandgap *bgp = dev_get_priv(dev); > + > + bgp->temperature = 0x3ff & readl(bgp->base + CTRL_CORE_TEMP_SENSOR_MPU); > + *temp = dra752_adc_to_temp[bgp->temperature - DRA752_ADC_START_VALUE]; > + > + return 0; > +} > + > +static struct dm_thermal_ops ti_thermal_ops = { > + .get_temp = ti_bandgap_get_temp, > +}; > + > +static int ti_bandgap_probe(struct udevice *dev) > +{ > + struct ti_bandgap *bgp = dev_get_priv(dev); > + > + bgp->base = devfdt_get_addr_index(dev, 1); > + > + return 0; > +} > + > +static const struct udevice_id of_ti_bandgap_match[] = { > + { > + .compatible = "ti,dra752-bandgap", > + }, I realise I need to add terminator ({}) brackets here. Is this applied to any tree yet? Should I send the patch to just add brackets or send the whole series again? Thanks, Faiz > +}; > + > +U_BOOT_DRIVER(ti_bandgap_thermal) = { > + .name = "ti_bandgap_thermal", > + .id = UCLASS_THERMAL, > + .ops = &ti_thermal_ops, > + .probe = ti_bandgap_probe, > + .of_match = of_ti_bandgap_match, > + .priv_auto_alloc_size = sizeof(struct ti_bandgap), > +}; >