On 09/19/2018 02:02 PM, Rafa? Mi?ecki wrote:

From: Rafa? Mi?ecki <rafal@milecki.pl>

This driver provides support for Northstar mux controller. It differs
from Northstar Plus one so a new binding and driver were needed.

Right now it includes support for SPI pins only which is caused by a
lack of access to Broadcom's datasheet. SPI pins info was extracted from
the Broadcom's SDK. Once more pins are discovered they can be added to
the driver without breaking any existing setups.

Signed-off-by: Rafa? Mi?ecki <rafal@milecki.pl>
---

[snip]

+static const struct pinctrl_pin_desc ns_pinctrl_pins[] = {
+	{ 0, "spi_clk" },
+	{ 1, "spi_ss" },
+	{ 2, "spi_mosi" },
+	{ 3, "spi_miso" },
+};

In case you are interested, here are the additional functions:

4: i2c_scl
5: i2c_sda

6: mdc
7: mdio

8: pwm0
9: pwm1
10: pwm2
11: pwm3

12: uart1_rx
13: uart1_tx
14: uart1_cts
15: uart1_rts

On BCM53012:

16: uart2_rx
17: uart2_tx
22: sdio_card_power_ctl
23: sdio_en_1p8

On BCM53013:

21: 25Mhz crystal output for I2S

Not an expert on pinctrl drivers, but it looks reasonable to me.
-- 
Florian