linux-kernel - Re: [PATCH 4/5] phy: rockchip: phy-rockchip-inno-csidphy: add support for rk3588 variant

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Message-ID: <ac629489-5086-4cf9-80ed-f5e56b132cf4@linaro.org>
Date: Tue, 17 Jun 2025 11:36:36 +0200
From: neil.armstrong@...aro.org
To: michael.riesch@...labora.com, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Jagan Teki <jagan@...rulasolutions.com>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Collabora Kernel Team <kernel@...labora.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-phy@...ts.infradead.org
Subject: Re: [PATCH 4/5] phy: rockchip: phy-rockchip-inno-csidphy: add support
 for rk3588 variant

On 17/06/2025 10:54, Michael Riesch via B4 Relay wrote:
> From: Michael Riesch <michael.riesch@...labora.com>
> 
> The Rockchip RK3588 MIPI CSI-2 DPHY can be supported using the existing
> phy-rockchip-inno-csidphy driver, the notable differences being
>   - the control bits in the GRF
>   - the additional reset line
> Add support for this variant.
> 
> Signed-off-by: Michael Riesch <michael.riesch@...labora.com>
> ---
>   drivers/phy/rockchip/phy-rockchip-inno-csidphy.c | 23 ++++++++++++++++++++++-
>   1 file changed, 22 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c b/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
> index 75533d071025..0840be668bfd 100644
> --- a/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
> +++ b/drivers/phy/rockchip/phy-rockchip-inno-csidphy.c
> @@ -30,6 +30,8 @@
>   #define RK3568_GRF_VI_CON0		0x0340
>   #define RK3568_GRF_VI_CON1		0x0344
>   
> +#define RK3588_CSIDPHY_GRF_CON0		0x0000
> +
>   /* PHY */
>   #define CSIDPHY_CTRL_LANE_ENABLE		0x00
>   #define CSIDPHY_CTRL_LANE_ENABLE_CK		BIT(6)
> @@ -115,6 +117,12 @@ static const struct dphy_reg rk3568_grf_dphy_regs[] = {
>   	[GRF_DPHY_CSIPHY_CLKLANE_EN] = PHY_REG(RK3568_GRF_VI_CON0, 1, 8),
>   };
>   
> +static const struct dphy_reg rk3588_grf_dphy_regs[] = {
> +	[GRF_DPHY_CSIPHY_FORCERXMODE] = PHY_REG(RK3588_CSIDPHY_GRF_CON0, 4, 0),
> +	[GRF_DPHY_CSIPHY_DATALANE_EN] = PHY_REG(RK3588_CSIDPHY_GRF_CON0, 4, 4),
> +	[GRF_DPHY_CSIPHY_CLKLANE_EN] = PHY_REG(RK3588_CSIDPHY_GRF_CON0, 1, 8),
> +};
> +
>   struct hsfreq_range {
>   	u32 range_h;
>   	u8 cfg_bit;
> @@ -373,6 +381,15 @@ static const struct dphy_drv_data rk3568_mipidphy_drv_data = {
>   	.grf_regs = rk3568_grf_dphy_regs,
>   };
>   
> +static const struct dphy_drv_data rk3588_mipidphy_drv_data = {
> +	.pwrctl_offset = -1,
> +	.ths_settle_offset = RK3568_CSIDPHY_CLK_WR_THS_SETTLE,
> +	.calib_offset = RK3568_CSIDPHY_CLK_CALIB_EN,
> +	.hsfreq_ranges = rk1808_mipidphy_hsfreq_ranges,
> +	.num_hsfreq_ranges = ARRAY_SIZE(rk1808_mipidphy_hsfreq_ranges),
> +	.grf_regs = rk3588_grf_dphy_regs,
> +};
> +
>   static const struct of_device_id rockchip_inno_csidphy_match_id[] = {
>   	{
>   		.compatible = "rockchip,px30-csi-dphy",
> @@ -394,6 +411,10 @@ static const struct of_device_id rockchip_inno_csidphy_match_id[] = {
>   		.compatible = "rockchip,rk3568-csi-dphy",
>   		.data = &rk3568_mipidphy_drv_data,
>   	},
> +	{
> +		.compatible = "rockchip,rk3588-csi-dphy",
> +		.data = &rk3588_mipidphy_drv_data,
> +	},
>   	{}
>   };
>   MODULE_DEVICE_TABLE(of, rockchip_inno_csidphy_match_id);
> @@ -435,7 +456,7 @@ static int rockchip_inno_csidphy_probe(struct platform_device *pdev)
>   		return PTR_ERR(priv->pclk);
>   	}
>   
> -	priv->rst = devm_reset_control_get(dev, "apb");
> +	priv->rst = devm_reset_control_array_get(dev, RESET_CONTROL_EXCLUSIVE);

It would be preferable to have the names of the resets lines and use devm_reset_control_bulk_get_exclusive(),
and probably add the reset names to dphy_drv_data

Neil

>   	if (IS_ERR(priv->rst)) {
>   		dev_err(dev, "failed to get system reset control\n");
>   		return PTR_ERR(priv->rst);
>