Re: [PATCH v3 2/7] soc: rockchip: io-domain: add rk3568 support

[Robin Murphy <robin.murphy@xxxxxxx>]

On 2021-08-05 13:01, Michael Riesch wrote:
> From: Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>
>
> The io-domain registers on RK3568 SoCs have three separated bits to
> enable/disable the 1.8v/2.5v/3.3v power.
>
> This patch make the write to be a operation, allow rk3568 uses a private
> register set function.
>
> Since the 2.5v is not used on RK3568, so the driver only set

FWIW, this seems at odds with what the first paragraph says - can anyone 
clarify what exactly "not used" means here? Is it that the I/O domain 
controller has been redesigned to support more than two logic levels on 
the new generation of SoCs, but RK3568's I/O pads still only physically 
support 1.8v and 3.3v; or is it that it *can* support 2.5v as well but 
no currently-known RK3568-based designs use that?

In the former case it's just a wording issue in the commit message, but 
in the latter it's arguably worth implementing support now for the sake 
of future compatibility.

Robin.

> 1.8v [enable] + 3.3v [disable] for 1.8v mode
> 1.8v [disable] + 3.3v [enable] for 3.3v mode
>
> There is not register order requirement which has been cleared by our IC
> team.
>
> Signed-off-by: Jianqun Xu <jay.xu@xxxxxxxxxxxxxx>
> ---
>   drivers/soc/rockchip/io-domain.c | 88 +++++++++++++++++++++++++++++---
>   1 file changed, 80 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/soc/rockchip/io-domain.c b/drivers/soc/rockchip/io-domain.c
> index cf8182fc3642..13c446fd33a9 100644
> --- a/drivers/soc/rockchip/io-domain.c
> +++ b/drivers/soc/rockchip/io-domain.c
> @@ -51,13 +51,11 @@
>   #define RK3399_PMUGRF_CON0_VSEL		BIT(8)
>   #define RK3399_PMUGRF_VSEL_SUPPLY_NUM	9
>   
> -struct rockchip_iodomain;
> +#define RK3568_PMU_GRF_IO_VSEL0		(0x0140)
> +#define RK3568_PMU_GRF_IO_VSEL1		(0x0144)
> +#define RK3568_PMU_GRF_IO_VSEL2		(0x0148)
>   
> -struct rockchip_iodomain_soc_data {
> -	int grf_offset;
> -	const char *supply_names[MAX_SUPPLIES];
> -	void (*init)(struct rockchip_iodomain *iod);
> -};
> +struct rockchip_iodomain;
>   
>   struct rockchip_iodomain_supply {
>   	struct rockchip_iodomain *iod;
> @@ -66,13 +64,62 @@ struct rockchip_iodomain_supply {
>   	int idx;
>   };
>   
> +struct rockchip_iodomain_soc_data {
> +	int grf_offset;
> +	const char *supply_names[MAX_SUPPLIES];
> +	void (*init)(struct rockchip_iodomain *iod);
> +	int (*write)(struct rockchip_iodomain_supply *supply, int uV);
> +};
> +
>   struct rockchip_iodomain {
>   	struct device *dev;
>   	struct regmap *grf;
>   	const struct rockchip_iodomain_soc_data *soc_data;
>   	struct rockchip_iodomain_supply supplies[MAX_SUPPLIES];
> +	int (*write)(struct rockchip_iodomain_supply *supply, int uV);
>   };
>   
> +static int rk3568_iodomain_write(struct rockchip_iodomain_supply *supply, int uV)
> +{
> +	struct rockchip_iodomain *iod = supply->iod;
> +	u32 is_3v3 = uV > MAX_VOLTAGE_1_8;
> +	u32 val0, val1;
> +	int b;
> +
> +	switch (supply->idx) {
> +	case 0: /* pmuio1 */
> +		break;
> +	case 1: /* pmuio2 */
> +		b = supply->idx;
> +		val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
> +		b = supply->idx + 4;
> +		val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);
> +
> +		regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL2, val0);
> +		regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL2, val1);
> +		break;
> +	case 3: /* vccio2 */
> +		break;
> +	case 2: /* vccio1 */
> +	case 4: /* vccio3 */
> +	case 5: /* vccio4 */
> +	case 6: /* vccio5 */
> +	case 7: /* vccio6 */
> +	case 8: /* vccio7 */
> +		b = supply->idx - 1;
> +		val0 = BIT(16 + b) | (is_3v3 ? 0 : BIT(b));
> +		val1 = BIT(16 + b) | (is_3v3 ? BIT(b) : 0);
> +
> +		regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL0, val0);
> +		regmap_write(iod->grf, RK3568_PMU_GRF_IO_VSEL1, val1);
> +		break;
> +	default:
> +		return -EINVAL;
> +	};
> +
> +	return 0;
> +}
> +
>   static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply,
>   				   int uV)
>   {
> @@ -136,7 +183,7 @@ static int rockchip_iodomain_notify(struct notifier_block *nb,
>   			return NOTIFY_BAD;
>   	}
>   
> -	ret = rockchip_iodomain_write(supply, uV);
> +	ret = supply->iod->write(supply, uV);
>   	if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE)
>   		return NOTIFY_BAD;
>   
> @@ -398,6 +445,22 @@ static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = {
>   	.init = rk3399_pmu_iodomain_init,
>   };
>   
> +static const struct rockchip_iodomain_soc_data soc_data_rk3568_pmu = {
> +	.grf_offset = 0x140,
> +	.supply_names = {
> +		"pmuio1",
> +		"pmuio2",
> +		"vccio1",
> +		"vccio2",
> +		"vccio3",
> +		"vccio4",
> +		"vccio5",
> +		"vccio6",
> +		"vccio7",
> +	},
> +	.write = rk3568_iodomain_write,
> +};
> +
>   static const struct rockchip_iodomain_soc_data soc_data_rv1108 = {
>   	.grf_offset = 0x404,
>   	.supply_names = {
> @@ -469,6 +532,10 @@ static const struct of_device_id rockchip_iodomain_match[] = {
>   		.compatible = "rockchip,rk3399-pmu-io-voltage-domain",
>   		.data = &soc_data_rk3399_pmu
>   	},
> +	{
> +		.compatible = "rockchip,rk3568-pmu-io-voltage-domain",
> +		.data = &soc_data_rk3568_pmu
> +	},
>   	{
>   		.compatible = "rockchip,rv1108-io-voltage-domain",
>   		.data = &soc_data_rv1108
> @@ -502,6 +569,11 @@ static int rockchip_iodomain_probe(struct platform_device *pdev)
>   	match = of_match_node(rockchip_iodomain_match, np);
>   	iod->soc_data = match->data;
>   
> +	if (iod->soc_data->write)
> +		iod->write = iod->soc_data->write;
> +	else
> +		iod->write = rockchip_iodomain_write;
> +
>   	parent = pdev->dev.parent;
>   	if (parent && parent->of_node) {
>   		iod->grf = syscon_node_to_regmap(parent->of_node);
> @@ -562,7 +634,7 @@ static int rockchip_iodomain_probe(struct platform_device *pdev)
>   		supply->reg = reg;
>   		supply->nb.notifier_call = rockchip_iodomain_notify;
>   
> -		ret = rockchip_iodomain_write(supply, uV);
> +		ret = iod->write(supply, uV);
>   		if (ret) {
>   			supply->reg = NULL;
>   			goto unreg_notify;