diff options
| author | Christophe Leroy | 2024-04-02 18:55:31 +0200 |
|---|---|---|
| committer | Christophe Leroy | 2024-04-18 15:47:46 +0200 |
| commit | c578728d2e33754e38af869f6cdf992d18d058da (patch) | |
| tree | a5eca446c2d63eb757a899ee0e32820d123e5587 | |
| parent | ea208201a12913e7a5b7b4b38624942effa44c05 (diff) | |
thermal: Add support for TI LM74
LM74 is a SPI temperature sensor.
Implement a driver to read temperature from it.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
| -rw-r--r-- | drivers/thermal/Kconfig | 6 | ||||
| -rw-r--r-- | drivers/thermal/Makefile | 1 | ||||
| -rw-r--r-- | drivers/thermal/ti-lm74.c | 52 |
3 files changed, 59 insertions, 0 deletions
diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index 681b621760d..440eb64a566 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -41,4 +41,10 @@ config TI_DRA7_THERMAL Enable thermal support for for the Texas Instruments DRA752 SoC family. The driver supports reading CPU temperature. +config TI_LM74_THERMAL + bool "Temperature sensor driver for TI LM74 chip" + help + Enable thermal support for the Texas Instruments LM74 chip. + The driver supports reading CPU temperature. + endif # if DM_THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 8acc7d20cb9..b5ab0fc221f 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -9,3 +9,4 @@ obj-$(CONFIG_IMX_THERMAL) += imx_thermal.o obj-$(CONFIG_IMX_SCU_THERMAL) += imx_scu_thermal.o obj-$(CONFIG_TI_DRA7_THERMAL) += ti-bandgap.o obj-$(CONFIG_IMX_TMU) += imx_tmu.o +obj-$(CONFIG_TI_LM74_THERMAL) += ti-lm74.o diff --git a/drivers/thermal/ti-lm74.c b/drivers/thermal/ti-lm74.c new file mode 100644 index 00000000000..7d56f75df06 --- /dev/null +++ b/drivers/thermal/ti-lm74.c @@ -0,0 +1,52 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * TI LM74 temperature sensor driver + * + * Copyright (C) 2024 CS GROUP France + * + */ + +#include <dm.h> +#include <thermal.h> +#include <spi.h> + +static int ti_lm74_get_temp(struct udevice *dev, int *temp) +{ + char buf[2]; + s16 raw; + int ret; + + ret = dm_spi_claim_bus(dev); + if (ret) + return ret; + + ret = dm_spi_xfer(dev, 16, NULL, buf, SPI_XFER_BEGIN | SPI_XFER_END); + + dm_spi_release_bus(dev); + if (ret) + return ret; + + raw = ((buf[0] << 8) + buf[1]) >> 3; + + *temp = (((int)raw * 125) + 1000) / 2000; + + return 0; +} + +static struct dm_thermal_ops ti_lm74_ops = { + .get_temp = ti_lm74_get_temp, +}; + +static const struct udevice_id of_ti_lm74_match[] = { + { + .compatible = "ti,lm74", + }, + {}, +}; + +U_BOOT_DRIVER(ti_bandgap_thermal) = { + .name = "ti_lm74_thermal", + .id = UCLASS_THERMAL, + .ops = &ti_lm74_ops, + .of_match = of_ti_lm74_match, +}; |