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authorVaradarajan Narayanan <varada@codeaurora.org>2017-07-28 09:52:48 +0300
committerMark Brown <broonie@kernel.org>2017-08-08 14:15:02 +0300
commitb702b9fb393ed1c19ab3ecb1552757522c982746 (patch)
tree90f364a85fac0c1d99e48671d495fca022fb5fe1 /drivers/spi/spi-qup.c
parent5771a8c08880cdca3bfb4a3fc6d309d6bba20877 (diff)
downloadlinux-b702b9fb393ed1c19ab3ecb1552757522c982746.tar.xz
spi: qup: Enable chip select support
Enable chip select support for QUP versions later than v1. The chip select support was broken in QUP version 1. Hence the chip select support was removed earlier in an earlier commit (4a8573abe "spi: qup: Remove chip select function"). Since the chip select support is functional in recent versions of QUP, re-enabling it for QUP versions later than v1. Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org> Signed-off-by: Varadarajan Narayanan <varada@codeaurora.org> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-qup.c')
-rw-r--r--drivers/spi/spi-qup.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 1bfa889b8427..c0d4defc1c13 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -750,6 +750,24 @@ err_tx:
return ret;
}
+static void spi_qup_set_cs(struct spi_device *spi, bool val)
+{
+ struct spi_qup *controller;
+ u32 spi_ioc;
+ u32 spi_ioc_orig;
+
+ controller = spi_master_get_devdata(spi->master);
+ spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
+ spi_ioc_orig = spi_ioc;
+ if (!val)
+ spi_ioc |= SPI_IO_C_FORCE_CS;
+ else
+ spi_ioc &= ~SPI_IO_C_FORCE_CS;
+
+ if (spi_ioc != spi_ioc_orig)
+ writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
+}
+
static int spi_qup_probe(struct platform_device *pdev)
{
struct spi_master *master;
@@ -846,6 +864,9 @@ static int spi_qup_probe(struct platform_device *pdev)
if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
controller->qup_v1 = 1;
+ if (!controller->qup_v1)
+ master->set_cs = spi_qup_set_cs;
+
spin_lock_init(&controller->lock);
init_completion(&controller->done);