ARM: nomadik: fix up SD/MMC DT settings

The DTSI file for the Nomadik does not properly specify how the
PL180 levelshifter is connected: the Nomadik actually needs all
the five st,sig-dir-* flags set to properly control all lines out.

Further this board supports full power cycling of the card, and
since this variant has no hardware clock gating, it needs a
ridiculously low frequency setting to keep up with the ever
overflowing FIFO.

The pin configuration set-up is a bit of a mystery, because of
course these pins are a mix of inputs and outputs. However the
reference implementation sets all pins to "output" with
unspecified initial value, so let's do that here as well.

Cc: stable@vger.kernel.org
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Olof Johansson <olof@lixom.net>

1 files changed, 20 insertions, 17 deletions

diff --git a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
index d0c743853318..27a333eb8987 100644
--- a/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
+++ b/arch/arm/boot/dts/ste-nomadik-stn8815.dtsi
@@ -127,22 +127,14 @@
                         };
                         mmcsd_default_mode: mmcsd_default {
                                 mmcsd_default_cfg1 {
-                                        /* MCCLK */
-                                        pins = "GPIO8_B10";
-                                        ste,output = <0>;
-                                };
-                                mmcsd_default_cfg2 {
-                                        /* MCCMDDIR, MCDAT0DIR, MCDAT31DIR, MCDATDIR2 */
-                                        pins = "GPIO10_C11", "GPIO15_A12",
-                                        "GPIO16_C13", "GPIO23_D15";
-                                        ste,output = <1>;
-                                };
-                                mmcsd_default_cfg3 {
-                                        /* MCCMD, MCDAT3-0, MCMSFBCLK */
-                                        pins = "GPIO9_A10", "GPIO11_B11",
-                                        "GPIO12_A11", "GPIO13_C12",
-                                        "GPIO14_B12", "GPIO24_C15";
-                                        ste,input = <1>;
+                                        /*
+                                         * MCCLK, MCCMDDIR, MCDAT0DIR, MCDAT31DIR, MCDATDIR2
+                                         * MCCMD, MCDAT3-0, MCMSFBCLK
+                                         */
+                                        pins = "GPIO8_B10", "GPIO9_A10", "GPIO10_C11", "GPIO11_B11",
+                                               "GPIO12_A11", "GPIO13_C12", "GPIO14_B12", "GPIO15_A12",
+                                               "GPIO16_C13", "GPIO23_D15", "GPIO24_C15";
+                                        ste,output = <2>;
                                 };
                         };
                 };
@@ -802,10 +794,21 @@
                         clock-names = "mclk", "apb_pclk";
                         interrupt-parent = <&vica>;
                         interrupts = <22>;
-                        max-frequency = <48000000>;
+                        max-frequency = <400000>;
                         bus-width = <4>;
                         cap-mmc-highspeed;
                         cap-sd-highspeed;
+                        full-pwr-cycle;
+                        /*
+                         * The STw4811 circuit used with the Nomadik strictly
+                         * requires that all of these signal direction pins be
+                         * routed and used for its 4-bit levelshifter.
+                         */
+                        st,sig-dir-dat0;
+                        st,sig-dir-dat2;
+                        st,sig-dir-dat31;
+                        st,sig-dir-cmd;
+                        st,sig-pin-fbclk;
                         pinctrl-names = "default";
                         pinctrl-0 = <&mmcsd_default_mux>, <&mmcsd_default_mode>;
                         vmmc-supply = <&vmmc_regulator>;