On some designs, the reset line could not be connected to the SoC reset
line, in this case, request the GPIO and ensure the chip gets reset.
Signed-off-by: Miquel Raynal <miquel.ray...@bootlin.com>
---
drivers/tpm/tpm2_tis_spi.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/tpm/tpm2_tis_spi.c b/drivers/tpm/tpm2_tis_spi.c
index cfef5b8c24..824ab70bae 100644
--- a/drivers/tpm/tpm2_tis_spi.c
+++ b/drivers/tpm/tpm2_tis_spi.c
@@ -24,6 +24,9 @@
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/unaligned/be_byteshift.h>
+#ifdef CONFIG_DM_GPIO
+#include <asm-generic/gpio.h>
+#endif
#include "tpm_tis.h"
#include "tpm_internal.h"
@@ -598,6 +601,21 @@ static int tpm_tis_spi_probe(struct udevice *dev)
{
struct tpm_chip *chip = dev_get_priv(dev);
int ret;
+#ifdef CONFIG_DM_GPIO
+ struct gpio_desc reset_gpio;
+
+ ret = gpio_request_by_name(dev, "gpio-reset", 0,
+ &reset_gpio, GPIOD_IS_OUT);
+ if (ret)
+ log(LOGC_NONE, LOGL_NOTICE, "%s: missing reset GPIO\n",
+ __func__);
+
+ if (dm_gpio_is_valid(&reset_gpio)) {
+ dm_gpio_set_value(&reset_gpio, 0);
+ mdelay(1);
+ dm_gpio_set_value(&reset_gpio, 1);
+ }
+#endif
/* Ensure a minimum amount of time elapsed since reset */
mdelay(30);
--
2.14.1
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