linux-kernel - Re: [Patch V6 3/3] spi: tegra210-quad: Enable TPM wait polling

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Message-ID: <Y/9Vkk1ioFWq+XLm@orome>
Date:   Wed, 1 Mar 2023 14:39:30 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krishna Yarlagadda <kyarlagadda@...dia.com>
Cc:     robh+dt@...nel.org, broonie@...nel.org, peterhuewe@....de,
        jgg@...pe.ca, jarkko@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-spi@...r.kernel.org, linux-tegra@...r.kernel.org,
        linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        jonathanh@...dia.com, skomatineni@...dia.com, ldewangan@...dia.com
Subject: Re: [Patch V6 3/3] spi: tegra210-quad: Enable TPM wait polling

On Mon, Feb 27, 2023 at 10:51:08PM +0530, Krishna Yarlagadda wrote:
> Trusted Platform Module requires flow control. As defined in TPM
> interface specification, client would drive MISO line at same cycle as
> last address bit on MOSI.
> Tegra241 QSPI controller has TPM wait state detection feature which is
> enabled for TPM client devices reported in SPI device mode bits.
> Set half duplex flag for TPM device to detect and send entire message
> to controller in one shot.
> 
> Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
> ---
>  drivers/spi/spi-tegra210-quad.c | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)

Acked-by: Thierry Reding <treding@...dia.com>

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