From a174f0001f5920f3ce76866cde85ee1aa8c94ee1 Mon Sep 17 00:00:00 2001 From: Miquel Raynal Date: Wed, 16 May 2018 08:59:16 +0200 Subject: [PATCH] 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 Reviewed-by: Simon Glass --- drivers/tpm/tpm2_tis_spi.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/tpm/tpm2_tis_spi.c b/drivers/tpm/tpm2_tis_spi.c index 518a08b..c5d17a6 100644 --- a/drivers/tpm/tpm2_tis_spi.c +++ b/drivers/tpm/tpm2_tis_spi.c @@ -23,6 +23,7 @@ #include #include #include +#include #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);