[U-Boot] [PATCH] arm: trats: add the sd-card power control function.

[Jaehoon Chung]

To use the sd-card, VTF_2.8V will be enabled.
Before this patch, VTF_2.8V is always disabled.(card can't initialize.)
When card is detected, SD-card power will enable with sd_ldo_control().

Signed-off-by: Jaehoon Chung <jh80.ch...@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
---
 board/samsung/trats/trats.c |   38 ++++++++++++++++++++++++++++++++------
 1 file changed, 32 insertions(+), 6 deletions(-)

diff --git a/board/samsung/trats/trats.c b/board/samsung/trats/trats.c
index 7f61d17..9b6dd12 100644
--- a/board/samsung/trats/trats.c
+++ b/board/samsung/trats/trats.c
@@ -408,11 +408,31 @@ int checkboard(void)
 #endif
 
 #ifdef CONFIG_GENERIC_MMC
+static int sd_ldo_control(int on)
+{
+       struct pmic *p = pmic_get("MAX8997_PMIC");
+       u32 val = 0;
+       int ret = 0;
+       if (pmic_probe(p))
+               return -1;
+
+       /* LDO17 VTF: 2.8V */
+       val = max8997_reg_ldo(2800000) | (on? EN_LDO : DIS_LDO);
+       ret |= pmic_reg_write(p, MAX8997_REG_LDO17CTRL, val);
+
+       if (ret) {
+               puts("MAX8997 SD setting error!\n");
+               return -1;
+       }
+
+       return 0;
+}
+
 int board_mmc_init(bd_t *bis)
 {
        struct exynos4_gpio_part2 *gpio =
                (struct exynos4_gpio_part2 *)samsung_get_base_gpio_part2();
-       int err;
+       int err, err_sd = 0;
 
        /* eMMC_EN: SD_0_CDn: GPK0[2] Output High */
        s5p_gpio_direction_output(&gpio->k0, 2, 1);
@@ -438,14 +458,20 @@ int board_mmc_init(bd_t *bis)
         * GPX3[4] T-flash detect pin
         */
        if (!s5p_gpio_get_value(&gpio->x3, 4)) {
-               err = exynos_pinmux_config(PERIPH_ID_SDMMC2, PINMUX_FLAG_NONE);
-               if (err)
+               err_sd = exynos_pinmux_config(PERIPH_ID_SDMMC2, 
PINMUX_FLAG_NONE);
+               if (err_sd)
                        debug("SDMMC2 not configured\n");
-               else
-                       err = s5p_mmc_init(2, 4);
+               else {
+                       if (!sd_ldo_control(1)) {
+                               err_sd = s5p_mmc_init(2, 4);
+                               if (err_sd) {
+                                       sd_ldo_control(0);
+                               }
+                       }
+               }
        }
 
-       return err;
+       return err & err_sd;
 }
 #endif
 
-- 
1.7.9.5
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