[PATCH] pico-imx7d: Add support for the 2GB variant

[Fabio Estevam]

Add the board detection mechanism to be able to support
the 2GB variant.

Based on the code from TechNexion U-Boot downstream tree.

Signed-off-by: Fabio Estevam <feste...@denx.de>
---
 board/technexion/pico-imx7d/spl.c | 30 +++++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/board/technexion/pico-imx7d/spl.c 
b/board/technexion/pico-imx7d/spl.c
index df5f058577..f86fee9c88 100644
--- a/board/technexion/pico-imx7d/spl.c
+++ b/board/technexion/pico-imx7d/spl.c
@@ -61,6 +61,8 @@ static struct ddrc ddrc_regs_val = {
        .dramtmg0       = 0x09081109,
        .addrmap0       = 0x0000001f,
        .addrmap1       = 0x00080808,
+       .addrmap2       = 0x00000000,
+       .addrmap3       = 0x00000000,
        .addrmap4       = 0x00000f0f,
        .addrmap5       = 0x07070707,
        .addrmap6       = 0x0f0f0707,
@@ -100,16 +102,38 @@ static void gpr_init(void)
        writel(0x4F400005, &gpr_regs->gpr[1]);
 }
 
-static bool is_1g(void)
+/*
+ * Revision Detection
+ *
+ *   GPIO1_12           GPIO1_13
+ *     0                0           1GB DDR3
+ *     0                1           2GB DDR3
+ *     1                0           512MB DDR3
+ */
+
+static int imx7d_pico_detect_board(void)
 {
        gpio_direction_input(IMX_GPIO_NR(1, 12));
-       return !gpio_get_value(IMX_GPIO_NR(1, 12));
+       gpio_direction_input(IMX_GPIO_NR(1, 13));
+
+       return gpio_get_value(IMX_GPIO_NR(1, 12)) << 1 |
+              gpio_get_value(IMX_GPIO_NR(1, 13));
 }
 
 static void ddr_init(void)
 {
-       if (is_1g())
+       switch (imx7d_pico_detect_board()) {
+       case 0:
                ddrc_regs_val.addrmap6  = 0x0f070707;
+               break;
+       case 1:
+               ddrc_regs_val.addrmap0  = 0x0000001f;
+               ddrc_regs_val.addrmap1  = 0x00181818;
+               ddrc_regs_val.addrmap4  = 0x00000f0f;
+               ddrc_regs_val.addrmap5  = 0x04040404;
+               ddrc_regs_val.addrmap6  = 0x04040404;
+               break;
+       }
 
        mx7_dram_cfg(&ddrc_regs_val, &ddrc_mp_val, &ddr_phy_regs_val,
                     &calib_param);
-- 
2.25.1