test: pinmux: Add test for pin muxing

This extends the pinctrl-sandbox driver to support pin muxing, and adds a
test for that behaviour. The test is done in C and not python (like the
existing tests for the pinctrl uclass) because it needs to call
pinctrl_select_state.  Another option could be to add a command that
invokes pinctrl_select_state and then test everything in
test/py/tests/test_pinmux.py.

The pinctrl-sandbox driver now mimics the way that many pinmux devices
work.  There are two groups of pins which are muxed together, as well as
four pins which are muxed individually. I have tried to test all normal
paths. However, very few error cases are explicitly checked for.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

3 files changed, 78 insertions, 18 deletions

diff --git a/test/dm/Makefile b/test/dm/Makefile
index 70ba1b66953..e2b07983885 100644
--- a/test/dm/Makefile
+++ b/test/dm/Makefile
@@ -81,4 +81,7 @@ obj-$(CONFIG_CLK_K210_SET_RATE) += k210_pll.o
 obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o
 obj-$(CONFIG_RESET_SYSCON) += syscon-reset.o
 obj-$(CONFIG_SCMI_FIRMWARE) += scmi.o
+ifneq ($(CONFIG_PINMUX),)
+obj-$(CONFIG_PINCONF) += pinmux.o
+endif
 endif
diff --git a/test/dm/pinmux.c b/test/dm/pinmux.c
new file mode 100644
index 00000000000..047184d4bcb
--- /dev/null
+++ b/test/dm/pinmux.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2020 Sean Anderson <seanga2@gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <dm/pinctrl.h>
+#include <dm/test.h>
+#include <test/ut.h>
+
+static int dm_test_pinmux(struct unit_test_state *uts)
+{
+	char buf[64];
+	struct udevice *dev;
+
+#define test_muxing(selector, expected) do { \
+	ut_assertok(pinctrl_get_pin_muxing(dev, selector, buf, sizeof(buf))); \
+	ut_asserteq_str(expected, (char *)&buf); \
+} while (0)
+
+	ut_assertok(uclass_get_device_by_name(UCLASS_PINCTRL, "pinctrl", &dev));
+	test_muxing(0, "UART TX.");
+	test_muxing(1, "UART RX.");
+	test_muxing(2, "I2S SCK.");
+	test_muxing(3, "I2S SD.");
+	test_muxing(4, "I2S WS.");
+	test_muxing(5, "GPIO0 bias-pull-up input-disable.");
+	test_muxing(6, "GPIO1 drive-open-drain.");
+	test_muxing(7, "GPIO2 bias-pull-down input-enable.");
+	test_muxing(8, "GPIO3 bias-disable.");
+
+	ut_assertok(pinctrl_select_state(dev, "alternate"));
+	test_muxing(0, "I2C SCL drive-open-drain.");
+	test_muxing(1, "I2C SDA drive-open-drain.");
+	test_muxing(2, "SPI SCLK.");
+	test_muxing(3, "SPI MOSI.");
+	test_muxing(4, "SPI MISO.");
+	test_muxing(5, "SPI CS0.");
+	test_muxing(6, "SPI CS1.");
+	test_muxing(7, "GPIO2 bias-pull-down input-enable.");
+	test_muxing(8, "GPIO3 bias-disable.");
+
+	ut_assertok(pinctrl_select_state(dev, "0"));
+	test_muxing(0, "I2C SCL drive-open-drain.");
+	test_muxing(1, "I2C SDA drive-open-drain.");
+	test_muxing(2, "I2S SCK.");
+	test_muxing(3, "I2S SD.");
+	test_muxing(4, "I2S WS.");
+	test_muxing(5, "GPIO0 bias-pull-up input-disable.");
+	test_muxing(6, "GPIO1 drive-open-drain.");
+	test_muxing(7, "GPIO2 bias-pull-down input-enable.");
+	test_muxing(8, "GPIO3 bias-disable.");
+
+	return 0;
+}
+DM_TEST(dm_test_pinmux, UT_TESTF_SCAN_FDT);
diff --git a/test/py/tests/test_pinmux.py b/test/py/tests/test_pinmux.py
index 4e6df992a4e..0cbbae000c8 100644
--- a/test/py/tests/test_pinmux.py
+++ b/test/py/tests/test_pinmux.py
@@ -28,15 +28,15 @@ def test_pinmux_status_all(u_boot_console):
     assert ('a6        : gpio output .' in output)
 
     assert ('pinctrl:' in output)
-    assert ('SCL       : I2C SCL.' in output)
-    assert ('SDA       : I2C SDA.' in output)
-    assert ('TX        : Uart TX.' in output)
-    assert ('RX        : Uart RX.' in output)
-    assert ('W1        : 1-wire gpio.' in output)
-    assert ('GPIO0     : gpio bias-pull-up input-disable.' in output)
-    assert ('GPIO1     : gpio drive-open-drain.' in output)
-    assert ('GPIO2     : gpio bias-pull-down input-enable.' in output)
-    assert ('GPIO3     : gpio bias-disable.' in output)
+    assert ('P0        : UART TX.' in output)
+    assert ('P1        : UART RX.' in output)
+    assert ('P2        : I2S SCK.' in output)
+    assert ('P3        : I2S SD.' in output)
+    assert ('P4        : I2S WS.' in output)
+    assert ('P5        : GPIO0 bias-pull-up input-disable.' in output)
+    assert ('P6        : GPIO1 drive-open-drain.' in output)
+    assert ('P7        : GPIO2 bias-pull-down input-enable.' in output)
+    assert ('P8        : GPIO3 bias-disable.' in output)
 
 @pytest.mark.buildconfigspec('cmd_pinmux')
 @pytest.mark.boardspec('sandbox')
@@ -73,12 +73,12 @@ def test_pinmux_status(u_boot_console):
     assert (not 'pinctrl-gpio:' in output)
     assert (not 'pinctrl:' in output)
 
-    assert ('SCL       : I2C SCL.' in output)
-    assert ('SDA       : I2C SDA.' in output)
-    assert ('TX        : Uart TX.' in output)
-    assert ('RX        : Uart RX.' in output)
-    assert ('W1        : 1-wire gpio.' in output)
-    assert ('GPIO0     : gpio bias-pull-up input-disable.' in output)
-    assert ('GPIO1     : gpio drive-open-drain.' in output)
-    assert ('GPIO2     : gpio bias-pull-down input-enable.' in output)
-    assert ('GPIO3     : gpio bias-disable.' in output)
+    assert ('P0        : UART TX.' in output)
+    assert ('P1        : UART RX.' in output)
+    assert ('P2        : I2S SCK.' in output)
+    assert ('P3        : I2S SD.' in output)
+    assert ('P4        : I2S WS.' in output)
+    assert ('P5        : GPIO0 bias-pull-up input-disable.' in output)
+    assert ('P6        : GPIO1 drive-open-drain.' in output)
+    assert ('P7        : GPIO2 bias-pull-down input-enable.' in output)
+    assert ('P8        : GPIO3 bias-disable.' in output)