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thermal: Add support for TI LM74

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LM74 is a SPI temperature sensor.

Implement a driver to read temperature from it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
This commit is contained in:
Christophe Leroy 2024-04-02 18:55:31 +02:00
parent ea208201a1
commit c578728d2e
3 changed files with 59 additions and 0 deletions
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6
drivers/thermal/Kconfig
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@ -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

1
drivers/thermal/Makefile
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@ -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

52
drivers/thermal/ti-lm74.c Normal file
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@ -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,
};