From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowjanya Komatineni Subject: [PATCH V1 26/26] spi: tegra114: add support for LSBYTE_FIRST Date: Tue, 26 Mar 2019 22:56:47 -0700 Message-ID: <1553666207-11414-26-git-send-email-skomatineni@nvidia.com> References: <1553666207-11414-1-git-send-email-skomatineni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1553666207-11414-1-git-send-email-skomatineni@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: thierry.reding@gmail.com, jonathanh@nvidia.com, talho@nvidia.com, skomatineni@nvidia.com, broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, kyarlagadda@nvidia.com Cc: ldewangan@nvidia.com, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org Some SPI devices expects SPI transfers to be in Least significant byte first order and some devices expect Most significant byte first order. This patch adds SPI_LSBYTE_FIRST to supported mode list and implements configuration accordingly. Signed-off-by: Sowjanya Komatineni --- drivers/spi/spi-tegra114.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index e1669ab3b0fe..a2e809af96da 100644 --- a/drivers/spi/spi-tegra114.c +++ b/drivers/spi/spi-tegra114.c @@ -827,6 +827,11 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi, else command1 &= ~SPI_LSBIT_FE; + if (spi->mode & SPI_LSBYTE_FIRST) + command1 |= SPI_LSBYTE_FE; + else + command1 &= ~SPI_LSBYTE_FE; + if (spi->mode & SPI_3WIRE) command1 |= SPI_BIDIROE; else @@ -1393,7 +1398,8 @@ static int tegra_spi_probe(struct platform_device *pdev) /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST | - SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE; + SPI_TX_DUAL | SPI_RX_DUAL | SPI_3WIRE | + SPI_LSBYTE_FIRST; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); master->setup = tegra_spi_setup; master->cleanup = tegra_spi_cleanup; -- 2.7.4