On 6 June 2013 22:11, Christian Ruppert <christian.ruppert@xxxxxxxxxx> wrote:
> On Wed, Jun 05, 2013 at 09:44:27AM +0800, Haojian Zhuang wrote:
>> On 3 June 2013 20:30, Christian Ruppert <christian.ruppert@xxxxxxxxxx> wrote:
>> > OK, here's a simplified example of what we would like to do (this seems
>> > pretty common so I suppose there is a way I haven't understood). Our
>> > situation is slightly more complex but for the purpose of discussion
>> > let's assume a chip with 8 pins which can be configured for the
>> > following functions:
>> >
>> > Pin GPIO-A I2C SPI0 SPI1
>> > ------------------------------------
>> > 1 GPIOA0 SDA MISO1
>> > 2 GPIOA1 SCL MOSI1
>> > 3 GPIOA2 SS1_B
>> > 4 GPIOA3 SCLK1
>> > 5 GPIOA4 MISO0
>> > 6 GPIOA5 MOSI0
>> > 7 GPIOA6 SS0_B
>> > 8 GPIOA7 SCLK0
>> >
>> > We can now define the following pinctrl-single:
>> >
>> > pinmux: pinmux@0xFFEE0000 {
>> > compatible = "pinctrl-single";
>> > reg = <0xFFEE0000 0x8>;
>> > #address-cells = <1>;
>> > #size-cells = <0>;
>> > #gpio-range-cells = <3>;
>> > pinctrl-single,register-width = <32>;
>> > pinctrl-single,function-mask = <0xffffffff>;
>> > pinctrl-single,gpio-range = <&range 1 8 0>;
>> > gpioa_pins: pinmux_gpioa_pins {
>> > pinctrl-single,pins = <0x0 0 0x4 0>
>> > };
>> > i2c_pins: pinmux_i2c_pins {
>> > pinctrl-single,pins = <0x0 1>
>> > };
>> > spi0_pins: pinmux_spi0_pins {
>> > pinctrl-single,pins = <0x1 1>
>> <0x1 1>?
>>
>> If each pinmux register is only for one pin in your SoC.
>> I think that your definitions are wrong above. We use
>> register offset as the first argument, not pin number.
>> And the second argument should be pin function number.
>
> In our case each pinmux register (bit field) actually controls an entire
> group of pins.
>
>> If multiple pins are sharing one register with different bits,
>> you need to enable "pinctrl-single,bit-per-mux".
>
> Multiple pins are sharing the same bits in the same register. Do you
> think this prevents us from using pinctrl-single?
>
Could you give me your register definition? Then I can understand you
better.
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