Hi,
On 02-09-17 12:10, Andy Shevchenko wrote:
On Sat, Sep 2, 2017 at 12:48 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
Add MUX_USB_* state constant defines, which can be used by USB
device/host and Type-C polarity/role/altmode mux drivers and consumers
to ensure that they agree on the meaning of the mux_control_select()
state argument.
+/*
+ * Mux state values for USB muxes, used for both USB device/host role muxes
+ * as well as for Type-C polarity/role/altmode muxes.
+ *
+ * MUX_USB_POLARITY_INV may be or-ed together with any other mux-state as
+ * inverted-polarity (Type-C plugged in upside down) can happen with any
+ * other mux-state.
+ */
+#define MUX_USB_POLARITY_INV BIT(0) /* Polarity inverted bit */
+#define MUX_USB_NONE (1 << 1) /* Mux open / not connected */
+#define MUX_USB_DEVICE (2 << 1) /* USB device mode */
+#define MUX_USB_HOST (3 << 1) /* USB host mode */
+#define MUX_USB_HOST_AND_DP_SRC (4 << 1) /* USB host + 2 lanes Display Port */
+#define MUX_USB_DP_SRC (5 << 1) /* 4 lanes Display Port source */
+#define MUX_USB_STATES (6 << 1)
I would put OR'ed bits higher.
Like allocate 4 (8) bits for states and start special flags from bit
8 and so on.
That is not an option because the mux framework expects a mux to declare
how much states it has (which is where the MUX_USB_STATES define comes in)
and any attemp to set a state higher then max_states will return with
-EINVAL.
Regards,
Hans
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