Hi Kaneko-san,
On Sat, Oct 20, 2018 at 11:35 PM Yoshihiro Kaneko <ykaneko0929@xxxxxxxxx> wrote:
> From: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx>
>
> This patch adds I2C-DVFS device node for the R8A77990 SoC.
>
> Signed-off-by: Takeshi Kihara <takeshi.kihara.df@xxxxxxxxxxx>
> Signed-off-by: Yoshihiro Kaneko <ykaneko0929@xxxxxxxxx>
Thanks for your patch!
> --- a/arch/arm64/boot/dts/renesas/r8a77990.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r8a77990.dtsi
> @@ -22,7 +22,8 @@
> i2c4 = &i2c4;
> i2c5 = &i2c5;
> i2c6 = &i2c6;
> - i2c7 = &i2c7;
> + i2c7 = &i2c_dvfs;
> + i2c8 = &i2c7;
Please don't change existing aliases.
While this makes the use of i2c7 for PMIC access uniform across the
range of R-Car Gen3 SoCs that have it, I think this is a bad idea, and that
it is better not to rely on I2C aliases at all.
I guess the BSP did this to configure the BD9571 PMIC for DDR backup
mode using i2cset? Upstream has another method, avoiding the need for
i2cset, cfr. Documentation/ABI/testing/sysfs-driver-bd9571mwv-regulator.
> };
>
> cpus {
> @@ -337,6 +338,22 @@
> reg = <0 0xe6060000 0 0x508>;
> };
>
> + i2c_dvfs: i2c@e60b0000 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + compatible = "renesas,iic-r8a77990",
"renesas,iic-r8a77990" is not yet documented.
> + "renesas,rcar-gen3-iic",
> + "renesas,rmobile-iic";
Also, IIC on R-Car E3 does not have the automatic transmission registers.
Does this affect claiming compatibility with the family-specific or generic
compatible values?
> + reg = <0 0xe60b0000 0 0x34>;
Why 0x34? Last (byte-sized) register documented is at 0x14 => 0x15?
> + interrupts = <GIC_SPI 173 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&cpg CPG_MOD 926>;
> + power-domains = <&sysc R8A77990_PD_ALWAYS_ON>;
> + resets = <&cpg 926>;
> + dmas = <&dmac0 0x11>, <&dmac0 0x10>;
> + dma-names = "tx", "rx";
> + status = "disabled";
> + };
> +
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
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
