From: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
Hi All,
This patch series aims to add PFC (Pin Function Controller) support for
Renesas RZ/V2H(P) SoC. The PFC block on RZ/V2H(P) is almost similar to
one found on the RZ/G2L family with couple of differences. To able to
re-use the use the existing driver for RZ/V2H(P) SoC function pointers
are introduced based on the SoC changes.
Sending this patch series as an RFC mainly as we are introducing a
SoC specific 'renesas-rzv2h,output-impedance' property to configure
the output impedance on the pins. Drive strength setting on RZ/V2H(P)
depends on the different power rails which are coming out from the PMIC
(connected via i2c). These power rails (required for drive strength) can
be 1.2/1.8/3.3V. Pin are grouped into 4 groups,
Group1: Impedance
- 150/75/38/25 ohms (at 3.3 V)
- 130/65/33/22 ohms (at 1.8 V)
Group2: Impedance
- 50/40/33/25 ohms (at 1.8 V)
Group3: Impedance
- 150/75/37.5/25 ohms (at 3.3 V)
- 130/65/33/22 ohms (at 1.8 V)
Group4: Impedance
- 110/55/30/20 ohms (at 1.8 V)
- 150/75/38/25 ohms (at 1.2 V)
The existing property 'output-impedance-ohms' cannot be used to specify
the output impedance setting on the pin mainly because,
1] The regulator information will not be available very earlier in boot process
2] The power rails info will be coming from the PMIC connected to I2C chip, as
i2c will also require configuring the PFC there will be an interdependence
of this two nodes.
3] We cannot use 'power-source' property for each pin as DTB's dont use up all
the pins on SoC and when dumping the pinconf-pins from debugfs we wont be
able to print the output-impedance of pins which are unused.
Due to above cons 'renesas-rzv2h,output-impedance' property is introduced where
it allows user to specify values [ x1 x2 x4 x6 ] which internally configures
the IOLH bits to value [ 0 1 2 3 ] respectively, and does not depend on the
actual voltage setting.
Cheers,
Prabhakar
Lad Prabhakar (13):
dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Remove the check from the
object
dt-bindings: pinctrl: renesas: Document RZ/V2H(P) SoC
pinctrl: renesas: pinctrl-rzg2l: Remove extra space in function
parameter
pinctrl: renesas: pinctrl-rzg2l: Allow more bits for pin configuration
pinctrl: renesas: pinctrl-rzg2l: Allow parsing of variable
configuration for all architectures
pinctrl: renesas: pinctrl-rzg2l: Make cfg to u64 in struct
rzg2l_variable_pin_cfg
pinctrl: renesas: pinctrl-rzg2l: Validate power registers for SD and
ETH
pinctrl: renesas: pinctrl-rzg2l: Add function pointers for writing to
PFC
pinctrl: renesas: pinctrl-rzg2l: Add function pointer for writing to
PMC register
pinctrl: renesas: pinctrl-rzg2l: Add function pointers for
reading/writing OEN register
pinctrl: renesas: pinctrl-rzg2l: Pass pincontrol device pointer to
pinconf_generic_parse_dt_config()
pinctrl: renesas: pinctrl-rzg2l: Add support to pass custom params
pinctrl: renesas: pinctrl-rzg2l: Add support for RZ/V2H SoC
.../pinctrl/renesas,rzg2l-pinctrl.yaml | 37 +-
drivers/pinctrl/renesas/pinctrl-rzg2l.c | 566 +++++++++++++++++-
2 files changed, 560 insertions(+), 43 deletions(-)
--
2.34.1
