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tpm2: tis_spi: add the possibility to reset the chip with a gpio

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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.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Miquel Raynal 2018-05-16 08:59:16 +02:00 committed by Tom Rini
parent eb46910b4b
commit a174f0001f
1 changed files with 16 additions and 0 deletions
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16
drivers/tpm/tpm2_tis_spi.c
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@ -23,6 +23,7 @@
#include <linux/compiler.h>
#include <linux/types.h>
#include <linux/unaligned/be_byteshift.h>
#include <asm-generic/gpio.h>
#include "tpm_tis.h"
#include "tpm_internal.h"
@ -574,6 +575,21 @@ static int tpm_tis_spi_probe(struct udevice *dev)
struct tpm_chip *chip = dev_get_priv(dev);
int ret;
if (IS_ENABLED(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__);
} else {
dm_gpio_set_value(&reset_gpio, 0);
mdelay(1);
dm_gpio_set_value(&reset_gpio, 1);
}
}
/* Ensure a minimum amount of time elapsed since reset of the TPM */
mdelay(drv_data->time_before_first_cmd_ms);