Re: [PATCH v4 4/5] pinctrl: renesas: rzg2l: Add RZ/G3S support for selecting the I3C power source

[claudiu beznea <claudiu.beznea@tuxon.dev>]

Hi, Biju,

On 7/12/26 17:55, Biju Das wrote:
> Hi Claudiu,
> 
> Thanks for the patch.
> 
>> -----Original Message-----
>> From: Claudiu Beznea <claudiu.beznea+renesas@tuxon.dev>
>> Sent: 10 July 2026 12:37
>> Subject: [PATCH v4 4/5] pinctrl: renesas: rzg2l: Add RZ/G3S support for selecting the I3C power source
>>
>> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>>
>> The Renesas RZ/G3S I3C pins can be powered at either 1.8V or 1.2V. The pin controller provides a register
>> to select between these two options.
>> Update the Renesas RZ/G2L pin controller driver to allow selecting the I3C power source on RZ/G3S SoC.
>>
>> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
>> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
>> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>> ---
>>
>> Changes in v4:
>> - none
>>
>> Changes in v3:
>> - collected tags
>>
>> Changes in v2:
>> - none
>>
>>   drivers/pinctrl/renesas/pinctrl-rzg2l.c | 73 +++++++++++++++++++++++--
>>   1 file changed, 68 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/pinctrl/renesas/pinctrl-rzg2l.c b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
>> index b52a85066f63..9a0706fea220 100644
>> --- a/drivers/pinctrl/renesas/pinctrl-rzg2l.c
>> +++ b/drivers/pinctrl/renesas/pinctrl-rzg2l.c
>> @@ -69,6 +69,7 @@
>>   #define PIN_CFG_PVDD1833_OTH_AWO_POC	BIT(19) /* known on RZ/G3L only */
>>   #define PIN_CFG_PVDD1833_OTH_ISO_POC	BIT(20) /* known on RZ/G3L only */
>>   #define PIN_CFG_WDTOVF_N_POC		BIT(21) /* known on RZ/G3L only */
>> +#define PIN_CFG_IO_VMC_I3C		BIT(22)
>>
>>   #define RZG2L_SINGLE_PIN		BIT_ULL(63)	/* Dedicated pin */
>>   #define RZG2L_VARIABLE_CFG		BIT_ULL(62)	/* Variable cfg for port pins */
>> @@ -186,6 +187,9 @@
>>   #define PVDD_3300		0	/* I/O domain voltage >= 3.3V */
>>   #define PVDD_MASK		0x3
>>
>> +#define PVDD_I3C_1200		1	/* I3C I/O domain voltage 1.2V */
>> +#define PVDD_I3C_1800		0	/* I3C I/O domain voltage 1.8V */
>> +
>>   #define PWPR_B0WI		BIT(7)	/* Bit Write Disable */
>>   #define PWPR_PFCWE		BIT(6)	/* PFC Register Write Enable */
>>   #define PWPR_REGWE_A		BIT(6)	/* PFC and PMC Register Write Enable on RZ/V2H(P) */
>> @@ -257,6 +261,7 @@ static const struct pin_config_item renesas_rzv2h_conf_items[] = {
>>    * @oen: OEN register offset
>>    * @qspi: QSPI register offset
>>    * @other_poc: OTHER_POC register offset
>> + * @i3c_set: I3C_SET register offset
>>    */
>>   struct rzg2l_register_offsets {
>>   	u16 pwpr;
>> @@ -265,6 +270,7 @@ struct rzg2l_register_offsets {
>>   	u16 oen;
>>   	u16 qspi;
>>   	u16 other_poc;
>> +	u16 i3c_set;
> 
> 
>>   };
>>
>>   /**
>> @@ -272,6 +278,7 @@ struct rzg2l_register_offsets {
>>    * @other_poc_pvdd1833_oth_awo_poc: PVDD1833_OTH_AWO_POC mask
>>    * @other_poc_pvdd1833_oth_iso_poc: PVDD1833_OTH_ISO_POC mask
>>    * @other_poc_wdtovf_n_poc: WDTOVF_N_POC mask
>> + * @i3c_set_poc: I3C_SET_POC mask
>>    */
>>   struct rzg2l_register_masks {
>>   	union {
>> @@ -281,6 +288,11 @@ struct rzg2l_register_masks {
>>   			u8 other_poc_pvdd1833_oth_iso_poc;
>>   			u8 other_poc_wdtovf_n_poc;
>>   		};
>> +
>> +		/* RZ/G3S masks */
>> +		struct {
>> +			u8 i3c_set_poc;
> 
> How this POC is different from Ethernet, SDHI and XSPI POC?

Different bit mask and offset for I3C SET_POC compared with ETH, SDHI, XSPI.

> For consistency, can't we handle like others?
Everything is handled the same way for all functionalities in 
rzg2l_caps_to_pwr_reg() from patch 1.

Thank you,
Claudiu