On Fri, Jun 26, 2015 at 5:23 PM, Ben Hutchings
<[email protected]> wrote:
> The pfc in the R8A7790 (and probably others in the R-Car gen 2 family)
> supports switching SDHI signals between 3.3V and 1.8V voltage, and the
> SD driver should do that when selecting a higher-speed mode.
>
> Add a flag for pins that support low voltage mode and SoC operations to
> get and set it. Implement the pinconf power-source parameter using these
> operations.
>
> Signed-off-by: Ben Hutchings <[email protected]>
> ---
> .../bindings/pinctrl/renesas,pfc-pinctrl.txt | 4 ++-
> drivers/pinctrl/sh-pfc/pinctrl.c | 34
> ++++++++++++++++++++--
> drivers/pinctrl/sh-pfc/sh_pfc.h | 6 ++++
> 3 files changed, 41 insertions(+), 3 deletions(-)
>
> diff --git
> a/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
> b/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
> index bfe72ec055e3..93651742f1c1 100644
> --- a/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
> +++ b/Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt
> @@ -69,7 +69,9 @@ Pin Configuration Node Properties:
>
> The pin configuration parameters use the generic pinconf bindings defined in
> pinctrl-bindings.txt in this directory. The supported parameters are
> -bias-disable, bias-pull-up and bias-pull-down.
> +bias-disable, bias-pull-up, bias-pull-down and power-source. For pins that
> +can operate with either 3.3V or 1.8V signals, the power-source value should
> +be 0 for 3.3V or 1 for 1.8V.
> @@ -121,6 +125,8 @@ struct sh_pfc_soc_operations {
> unsigned int (*get_bias)(struct sh_pfc *pfc, unsigned int pin);
> void (*set_bias)(struct sh_pfc *pfc, unsigned int pin,
> unsigned int bias);
> + bool (*get_low_voltage)(struct sh_pfc *pfc, unsigned int pin);
> + void (*set_low_voltage)(struct sh_pfc *pfc, unsigned int pin, bool
> low);
> };
Given the sh-pfc driver is used for a whole range of SoCs, I think a boolean
value is a bit too limiting.
E.g. In addition to 1.8V and 3.3 V, R-Car M2 has pins supporting three
voltage levels (1.35V, 1.5V, and 18.V).
R-Mobile APE6 supports 1.2V, 1.8V, and 3.3V, but max. only 2 out of 3 for
a single pin.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [email protected]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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