Hi Miquel,
On 2 May 2018 at 02:59, Miquel Raynal <miquel.ray...@bootlin.com> wrote:
> 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)) {
If ret is 0 you know the GPIO is valid, so just check ret.
> + 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
>
Regards,
Simon
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