arm: dts: medaitek: add flash interface driving settings for mt7988

Add driving settings for both SPI and SD/eMMC interfaces to support ensure
flash devices is accessible for ram-booting.

Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

diff --git a/arch/arm/dts/mt7988-rfb.dts b/arch/arm/dts/mt7988-rfb.dts
index 817fe40..2579d70 100644 (file)
--- a/arch/arm/dts/mt7988-rfb.dts
+++ b/arch/arm/dts/mt7988-rfb.dts
@@ -101,6 +101,19 @@
                        function = "spi";
                        groups = "spi0", "spi0_wp_hold";
                };
+
+               conf-pu {
+                       pins = "SPI0_CSB", "SPI0_HOLD", "SPI0_WP";
+                       drive-strength = <MTK_DRIVE_8mA>;
+                       bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+               };
+
+               conf-pd {
+                       pins = "SPI0_CLK", "SPI0_MOSI", "SPI0_MISO";
+                       drive-strength = <MTK_DRIVE_8mA>;
+                       bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+               };
+
        };
 
        spi2_pins: spi2-pins {
@@ -108,6 +121,18 @@
                        function = "spi";
                        groups = "spi2", "spi2_wp_hold";
                };
+
+               conf-pu {
+                       pins = "SPI2_CSB", "SPI2_HOLD", "SPI2_WP";
+                       drive-strength = <MTK_DRIVE_8mA>;
+                       bias-pull-up = <MTK_PUPD_SET_R1R0_11>;
+               };
+
+               conf-pd {
+                       pins = "SPI2_CLK", "SPI2_MOSI", "SPI2_MISO";
+                       drive-strength = <MTK_DRIVE_8mA>;
+                       bias-pull-down = <MTK_PUPD_SET_R1R0_11>;
+               };
        };
 
        mmc0_pins_default: mmc0default {
@@ -121,18 +146,25 @@
                               "EMMC_DATA_3", "EMMC_DATA_4", "EMMC_DATA_5",
                               "EMMC_DATA_6", "EMMC_DATA_7", "EMMC_CMD";
                        input-enable;
+                       drive-strength = <MTK_DRIVE_4mA>;
+                       mediatek,pull-up-adv = <1>;     /* pull-up 10K */
                };
 
                conf-clk {
                        pins = "EMMC_CK";
+                       drive-strength = <MTK_DRIVE_6mA>;
+                       mediatek,pull-down-adv = <2>;   /* pull-down 50K */
                };
 
                conf-dsl {
                        pins = "EMMC_DSL";
+                       mediatek,pull-down-adv = <2>;   /* pull-down 50K */
                };
 
                conf-rst {
                        pins = "EMMC_RSTB";
+                       drive-strength = <MTK_DRIVE_4mA>;
+                       mediatek,pull-up-adv = <1>;     /* pull-up 10K */
                };
        };
 };