From mboxrd@z Thu Jan 1 00:00:00 1970 From: Miquel Raynal Date: Wed, 2 May 2018 10:59:27 +0200 Subject: [U-Boot] [PATCH v3 18/25] tpm: add the possibility to reset the chip with a gpio In-Reply-To: <20180502085934.29292-1-miquel.raynal@bootlin.com> References: <20180502085934.29292-1-miquel.raynal@bootlin.com> Message-ID: <20180502085934.29292-19-miquel.raynal@bootlin.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de 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 --- 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 #include #include +#ifdef CONFIG_DM_GPIO +#include +#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