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From: Sowjanya Komatineni <skomatineni@nvidia.com>
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>
Subject: [PATCH V3 6/9] spi: tegra114: add support for gpio based CS
Date: Mon, 15 Apr 2019 14:30:31 -0700	[thread overview]
Message-ID: <1555363834-32155-7-git-send-email-skomatineni@nvidia.com> (raw)
In-Reply-To: <1555363834-32155-1-git-send-email-skomatineni@nvidia.com>

This patch adds support for GPIO based CS control through SPI core
function spi_set_cs.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
---
 drivers/spi/spi-tegra114.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index f4e39eb3857c..0b04eba242c0 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -781,6 +781,9 @@ static u32 tegra_spi_setup_transfer_one(struct spi_device *spi,
 		} else
 			tegra_spi_writel(tspi, command1, SPI_COMMAND1);
 
+		/* GPIO based chip select control */
+		spi_set_cs(spi, true);
+
 		command1 |= SPI_CS_SW_HW;
 		if (spi->mode & SPI_CS_HIGH)
 			command1 |= SPI_CS_SW_VAL;
@@ -869,6 +872,8 @@ static int tegra_spi_setup(struct spi_device *spi)
 	}
 
 	spin_lock_irqsave(&tspi->lock, flags);
+	/* GPIO based chip select control */
+	spi_set_cs(spi, false);
 	val = tspi->def_command1_reg;
 	if (spi->mode & SPI_CS_HIGH)
 		val &= ~SPI_CS_POL_INACTIVE(spi->chip_select);
@@ -898,6 +903,8 @@ static void tegra_spi_transfer_end(struct spi_device *spi)
 	struct tegra_spi_data *tspi = spi_master_get_devdata(spi->master);
 	int cs_val = (spi->mode & SPI_CS_HIGH) ? 0 : 1;
 
+	/* GPIO based chip select control */
+	spi_set_cs(spi, false);
 	if (cs_val)
 		tspi->command1_reg |= SPI_CS_SW_VAL;
 	else
-- 
2.7.4


  parent reply	other threads:[~2019-04-15 21:31 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-15 21:30 [PATCH V3 0/9] bug fixes and more features to Tegra SPI Sowjanya Komatineni
2019-04-15 21:30 ` [PATCH V3 1/9] spi: tegra114: fix PIO transfer Sowjanya Komatineni
2019-04-16 16:32   ` Applied "spi: tegra114: fix PIO transfer" to the spi tree Mark Brown
2019-04-29 21:42     ` Sowjanya Komatineni
2019-05-02  2:42       ` Mark Brown
2019-04-15 21:30 ` [PATCH V3 2/9] spi: expand mode support Sowjanya Komatineni
2019-04-18 10:26   ` Applied "spi: expand mode support" to the spi tree Mark Brown
2019-05-02  2:19   ` Mark Brown
2019-04-15 21:30 ` [PATCH V3 3/9] spi: add SPI_LSBYTE_FIRST mode Sowjanya Komatineni
2019-04-19 15:22   ` Mark Brown
2019-04-27  0:32     ` Sowjanya Komatineni
2019-05-06  4:49       ` Mark Brown
2019-04-15 21:30 ` [PATCH V3 4/9] spi: tegra114: add support for Tegra SPI LSBYTE_FIRST Sowjanya Komatineni
2019-04-15 21:30 ` [PATCH V3 5/9] spi: export spi core function spi_set_cs Sowjanya Komatineni
2019-04-19 15:18   ` Mark Brown
2019-04-29 22:02     ` Sowjanya Komatineni
2019-05-06  4:44       ` Mark Brown
2019-05-10 18:53         ` Sowjanya Komatineni
2019-05-12  3:12           ` Mark Brown
2019-04-15 21:30 ` Sowjanya Komatineni [this message]
2019-04-15 21:30 ` [PATCH V3 7/9] spi: tegra114: add support for hw based cs Sowjanya Komatineni
2019-04-15 21:30 ` [PATCH V3 8/9] spi: tegra114: add support for HW CS timing Sowjanya Komatineni
2019-04-15 21:30 ` [PATCH V3 9/9] spi: tegra114: add support for TX and RX trimmers Sowjanya Komatineni

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