target/linux/ipq806x/patches-4.9/0068-spi-add-gpio-cs-support.patch

   1 From b9c998eb7735df8000cf48d77f9271823e8e73da Mon Sep 17 00:00:00 2001
   2 From: Ram Chandra Jangir <rjangi@codeaurora.org>
   3 Date: Thu, 9 Mar 2017 09:39:05 +0100
   4 Subject: [PATCH 68/69] spi: add gpio cs support
   5
   6 Signed-off-by: John Crispin <john@phrozen.org>
   7 ---
   8  drivers/spi/spi-qup.c | 38 ++++++++++++++++++++++++++++++++++++++
   9  1 file changed, 38 insertions(+)
  10
  11 --- a/drivers/spi/spi-qup.c
  12 +++ b/drivers/spi/spi-qup.c
  13 @@ -24,6 +24,7 @@
  14  #include <linux/spi/spi.h>
  15  #include <linux/dmaengine.h>
  16  #include <linux/dma-mapping.h>
  17 +#include <linux/gpio.h>
  18
  19  #define QUP_CONFIG                     0x0000
  20  #define QUP_STATE                      0x0004
  21 @@ -1019,6 +1020,38 @@ err_tx:
  22         return ret;
  23  }
  24
  25 +static void spi_qup_set_cs(struct spi_device *spi, bool val)
  26 +{
  27 +       struct spi_qup *controller;
  28 +       u32 spi_ioc;
  29 +       u32 spi_ioc_orig;
  30 +
  31 +       controller = spi_master_get_devdata(spi->master);
  32 +       spi_ioc = readl_relaxed(controller->base + SPI_IO_CONTROL);
  33 +       spi_ioc_orig = spi_ioc;
  34 +       if (!val)
  35 +               spi_ioc |= SPI_IO_C_FORCE_CS;
  36 +       else
  37 +               spi_ioc &= ~SPI_IO_C_FORCE_CS;
  38 +
  39 +       if (spi_ioc != spi_ioc_orig)
  40 +               writel_relaxed(spi_ioc, controller->base + SPI_IO_CONTROL);
  41 +}
  42 +
  43 +static int spi_qup_setup(struct spi_device *spi)
  44 +{
  45 +       if (spi->cs_gpio >= 0) {
  46 +               if (spi->mode & SPI_CS_HIGH)
  47 +                       gpio_set_value(spi->cs_gpio, 0);
  48 +               else
  49 +                       gpio_set_value(spi->cs_gpio, 1);
  50 +
  51 +               udelay(10);
  52 +       }
  53 +
  54 +       return 0;
  55 +}
  56 +
  57  static int spi_qup_probe(struct platform_device *pdev)
  58  {
  59         struct spi_master *master;
  60 @@ -1115,6 +1148,11 @@ static int spi_qup_probe(struct platform
  61         if (of_device_is_compatible(dev->of_node, "qcom,spi-qup-v1.1.1"))
  62                 controller->qup_v1 = 1;
  63
  64 +       if (!controller->qup_v1)
  65 +               master->set_cs = spi_qup_set_cs;
  66 +       else
  67 +               master->setup = spi_qup_setup;
  68 +
  69         spin_lock_init(&controller->lock);
  70         init_completion(&controller->done);
  71         init_completion(&controller->dma_tx_done);