diff options
| author | Miquel Raynal <miquel.raynal@bootlin.com> | 2018-05-16 08:59:16 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2018-05-25 20:12:59 -0400 |
| commit | a174f0001f5920f3ce76866cde85ee1aa8c94ee1 (patch) | |
| tree | d8c056d98315ca97b242a3039e875accfa7d4d87 /drivers | |
| parent | eb46910b4bf03e2651533473dd75267704a6c659 (diff) | |
tpm2: tis_spi: add the possibility to reset the chip with a gpio
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tpm/tpm2_tis_spi.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/tpm/tpm2_tis_spi.c b/drivers/tpm/tpm2_tis_spi.c index 518a08b48d..c5d17a679d 100644 --- a/drivers/tpm/tpm2_tis_spi.c +++ b/drivers/tpm/tpm2_tis_spi.c @@ -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); |