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Support Renesas RA SCI I2C driver #96558

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c536e52
drivers: i2c: Initial support for i2c sci driver on Renesas RA
khaicaorvc Sep 29, 2025
3c8457f
dts: arm: add SCI I2C device node for RA6 series
khaicaorvc Sep 29, 2025
71e8089
dts: arm: add SCI I2C device node for RA4 series
khaicaorvc Sep 29, 2025
fea429d
dts: arm: add SCI I2C device node for RA2 series
khaicaorvc Sep 29, 2025
f2dc114
boards: renesas: Add SCI I2C node on Renesas RA boards
khaicaorvc Sep 29, 2025
b737861
tests: i2c: add support for i2c sci on Renesas RA boards
khaicaorvc Sep 29, 2025
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10 changes: 10 additions & 0 deletions boards/renesas/ek_ra6m4/ek_ra6m4-pinctrl.dtsi
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,16 @@
};
};

sci2_default: sci2_default {
group1 {
/* sda scl */
psels = <RA_PSEL(RA_PSEL_SCI_2, 1, 12)>,
<RA_PSEL(RA_PSEL_SCI_2, 1, 13)>;
drive-strength = "medium";
drive-open-drain;
};
};

sci7_default: sci7_default {
group1 {
/* tx rx */
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11 changes: 11 additions & 0 deletions boards/renesas/ek_ra6m4/ek_ra6m4.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,17 @@
};
};

&sci2 {
pinctrl-0 = <&sci2_default>;
pinctrl-names = "default";

i2c2: i2c {
sda-output-delay = <300>;
noise-filter-clock-select = <1>;
bit-rate-modulation;
};
};

&sci7 {
pinctrl-0 = <&sci7_default>;
pinctrl-names = "default";
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10 changes: 10 additions & 0 deletions boards/renesas/ek_ra6m5/ek_ra6m5-pinctrl.dtsi
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Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,16 @@
};
};

sci2_default: sci2_default {
group1 {
/* sda scl */
psels = <RA_PSEL(RA_PSEL_SCI_2, 1, 12)>,
<RA_PSEL(RA_PSEL_SCI_2, 1, 13)>;
drive-strength = "medium";
drive-open-drain;
};
};

sci7_default: sci7_default {
group1 {
/* tx rx */
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11 changes: 11 additions & 0 deletions boards/renesas/ek_ra6m5/ek_ra6m5.dts
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,17 @@
};
};

&sci2 {
pinctrl-0 = <&sci2_default>;
pinctrl-names = "default";

i2c2: i2c {
sda-output-delay = <300>;
noise-filter-clock-select = <1>;
bit-rate-modulation;
};
};

&sci7 {
pinctrl-0 = <&sci7_default>;
pinctrl-names = "default";
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1 change: 1 addition & 0 deletions drivers/i2c/CMakeLists.txt
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Expand Up @@ -56,6 +56,7 @@ zephyr_library_sources_ifdef(CONFIG_I2C_NXP_II2C i2c_nxp_ii2c.c)
zephyr_library_sources_ifdef(CONFIG_I2C_OMAP i2c_omap.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RCAR i2c_rcar.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RA_IIC i2c_renesas_ra_iic.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RA_SCI i2c_renesas_ra_sci.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RA_SCI_B i2c_renesas_ra_sci_b.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RX_RIIC i2c_renesas_rx_riic.c)
zephyr_library_sources_ifdef(CONFIG_I2C_RENESAS_RZ_IIC i2c_renesas_rz_riic.c)
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19 changes: 19 additions & 0 deletions drivers/i2c/Kconfig.renesas_ra
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Expand Up @@ -12,6 +12,25 @@ config I2C_RENESAS_RA_IIC
help
Enable Renesas RA I2C IIC Driver.

config I2C_RENESAS_RA_SCI
bool "Renesas RA SCI I2C"
default y
depends on DT_HAS_RENESAS_RA_I2C_SCI_ENABLED
select USE_RA_FSP_SCI_I2C
select PINCTRL
help
Enable Renesas RA SCI I2C Driver.

if I2C_RENESAS_RA_SCI
config I2C_RENESAS_RA_SCI_DTC
Comment on lines +24 to +25
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Better to add a blank line between if * and the following code

bool "DTC on Transmission and Reception"
default y
select USE_RA_FSP_DTC
help
Enable DTC on transmission and reception

endif

config I2C_RENESAS_RA_SCI_B
bool "Renesas RA SCI-B I2C"
default y
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