On Thu, Jun 6, 2024 at 10:51 AM Prabhakar <prabhakar.csengg@xxxxxxxxx> wrote: > From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> > > Add documentation for the pin controller found on the Renesas RZ/V2H(P) > (R9A09G057) SoC. The RZ/V2H PFC varies slightly compared to the RZ/G2L > family: > - Additional bits need to be set during pinmuxing. > - The GPIO pin count is different. > > Hence, a SoC-specific compatible string, 'renesas,r9a09g057-pinctrl', is > added for the RZ/V2H(P) SoC. > > Also, add the 'renesas,output-impedance' property. The drive strength > setting on RZ/V2H(P) depends on the different power rails coming out from > the PMIC (connected via I2C). These power rails (required for drive > strength) can be 1.2V, 1.8V, or 3.3V. > > Pins are grouped into 4 groups: > > Group 1: Impedance > - 150/75/38/25 ohms (at 3.3V) > - 130/65/33/22 ohms (at 1.8V) > > Group 2: Impedance > - 50/40/33/25 ohms (at 1.8V) > > Group 3: Impedance > - 150/75/37.5/25 ohms (at 3.3V) > - 130/65/33/22 ohms (at 1.8V) > > Group 4: Impedance > - 110/55/30/20 ohms (at 1.8V) > - 150/75/38/25 ohms (at 1.2V) > > The 'renesas,output-impedance' property, as documented, can be > [0, 1, 2, 3], these correspond to register bit values that can > be set in the PFC_IOLH_mn register, which adjusts the drive > strength value and is pin-dependent. > > As power rail information may not be available very early in the boot > process, the 'renesas,output-impedance' property is added instead of > reusing the 'output-impedance-ohms' property. > > Also, allow bias-disable, bias-pull-down and bias-pull-up properties > as these can be used to configure the pins. > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx> > --- > Sending just the binding patch of series [0] as reset of the patches have > been Reviewed. > > [0] https://patchwork.kernel.org/project/linux-renesas-soc/cover/20240530173857.164073-1-prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx/ > > v3->v4 > - Added a conditional schema for ensuring the reset length > is 2 for RZ/V2H and 3 otherwise > - Updated description for renesas,output-impedance property > - Dropped '|' Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx> i.e. will queue in renesas-pinctrl for v6.11. 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
