From 155fa9af95ac5be857a7327e7a968a296e60d4c8 Mon Sep 17 00:00:00 2001 From: Nikita Kiryanov Date: Wed, 20 Aug 2014 15:08:50 +0300 Subject: spi: mxc: fix sf probe when using mxc_spi MXC SPI driver has a feature whereas a GPIO line can be used to force CS high across multiple transactions. This is set up by embedding the GPIO information in the CS value: cs = (cs | gpio << 8) This merge of cs and gpio data into one value breaks the sf probe command: if the use of gpio is required, invoking "sf probe " will not work, because the CS argument doesn't have the GPIO information in it. Instead, the user must use "sf probe ". For example, if bank 2 gpio 30 is used to force cs high on cs 0, bus 0, then instead of typing "sf probe 0" the user now must type "sf probe 15872". This is inconsistent with the description of the sf probe command, and forces the user to be aware of implementaiton details. Fix this by introducing a new board function: board_spi_cs_gpio(), which will accept a naked CS value, and provide the driver with the relevant GPIO, if one is necessary. Cc: Eric Nelson Cc: Eric Benard Cc: Fabio Estevam Cc: Tim Harvey Cc: Stefano Babic Cc: Tom Rini Cc: Marek Vasut Reviewed-by: Marek Vasut Signed-off-by: Nikita Kiryanov Reviewed-by: Jagannadha Sutradharudu Teki --- board/embest/mx6boards/mx6boards.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'board/embest/mx6boards') diff --git a/board/embest/mx6boards/mx6boards.c b/board/embest/mx6boards/mx6boards.c index 530ea4f..a725f15 100644 --- a/board/embest/mx6boards/mx6boards.c +++ b/board/embest/mx6boards/mx6boards.c @@ -285,6 +285,11 @@ iomux_v3_cfg_t const ecspi1_pads[] = { MX6_PAD_EIM_EB2__GPIO2_IO30 | MUX_PAD_CTRL(NO_PAD_CTRL), }; +int board_spi_cs_gpio(unsigned bus, unsigned cs) +{ + return (bus == 0 && cs == 0) ? (IMX_GPIO_NR(2, 30)) : -1; +} + static void setup_spi(void) { imx_iomux_v3_setup_multiple_pads(ecspi1_pads, ARRAY_SIZE(ecspi1_pads)); -- cgit v1.1