• Antoine Tenart's avatar
    pinctrl: berlin: add the core pinctrl driver for Marvell Berlin SoCs · 3de68d33
    Antoine Tenart authored
    The Marvell Berlin boards have a group based pinmuxing mechanism. This
    adds the core driver support. We actually do not need any information
    about the pins here and only have the definition of the groups.
    
    Let's take the example of the uart0 pinmuxing on the BG2Q. Balls BK4 and
    BH6 are muxed to respectively UART0 RX and TX if the group GSM12 is set
    to mode 0:
    
    Group	Modes	Offset Base	Offset	LSB	Bit Width
    GSM12	3	sm_base		0x40	0x10	0x2
    
    Ball	Group	Mode 0		Mode 1		Mode 2
    BK4	GSM12	UART0_RX	IrDA0_RX	GPIO9
    BH6	GSM12	UART0_TX	IrDA0_TX	GPIO10
    
    So in order to configure BK4 -> UART0_TX and BH6 -> UART0_RX, we need
    to set (sm_base + 0x40 + 0x10) &= ff3fffff.
    
    As pin control registers are part of either chip control or system
    control registers, that deal with a bunch of other functions we rely
    on a regmap instead of exclusively remapping any resources.
    Signed-off-by: default avatarAntoine Tenart <antoine.tenart@free-electrons.com>
    Acked-by: default avatarSebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
    Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
    3de68d33
berlin.c 8.34 KB