target/linux/brcm2708/patches-4.19/950-0777-spidev-Completely-disable-the-DT-warning.patch

   1 From ce0e4cf60033eb7e15266b329183f945f2a82c61 Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Mon, 2 Dec 2019 10:28:44 +0000
   4 Subject: [PATCH] spidev: Completely disable the DT warning
   5
   6 The upstream SPI and DT maintainers are completely opposed to declaring
   7 in Device Tree that an SPI CS line is to be managed by the spidev
   8 driver, even though the facility is useful on a hobbyist device like a
   9 Raspberry Pi where arbitrary devices can be attached, and the
  10 alternative to DT declaration (spi_board_info) has been almost entirely
  11 rendered obsolete by DT.
  12
  13 Continue to override their objections by disabling the warning.
  14
  15 See: https://github.com/raspberrypi/linux/issues/3361
  16      https://github.com/raspberrypi/linux/issues/1054
  17
  18 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  19 ---
  20  drivers/spi/spidev.c | 1 +
  21  1 file changed, 1 insertion(+)
  22
  23 --- a/drivers/spi/spidev.c
  24 +++ b/drivers/spi/spidev.c
  25 @@ -728,6 +728,7 @@ static int spidev_probe(struct spi_devic
  26          * compatible string, it is a Linux implementation thing
  27          * rather than a description of the hardware.
  28          */
  29 +       if (0) /* Disable the warning - this feature is too useful */
  30         WARN(spi->dev.of_node &&
  31              of_device_is_compatible(spi->dev.of_node, "spidev"),
  32              "%pOF: buggy DT: spidev listed directly in DT\n", spi->dev.of_node);