[PATCH 01/18] spi: qup: Enable chip select support
From: Varadarajan Narayanan <hidden>
Date: 2017-06-14 05:53:22
Also in:
linux-arm-msm, linux-spi, lkml
Subsystem:
arm/qualcomm mailing list, spi subsystem, the rest · Maintainers:
Mark Brown, Linus Torvalds
Enable chip select support for QUP versions later than v1 Signed-off-by: Sham Muthayyan <redacted> Signed-off-by: Varadarajan Narayanan <redacted> --- drivers/spi/spi-qup.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index 1bfa889..c0d4def 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c@@ -750,6 +750,24 @@ static int spi_qup_init_dma(struct spi_master *master, resource_size_t base) 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);
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