phy: rockchip: phy-rockchip-inno-csidphy: allow for different reset lines

The RK3588 MIPI CSI-2 DPHY variant requires two reset lines. Add support
for different sets of reset lines to the phy-rockchip-inno-csidphy driver
as preparation for the introduction of the RK3588 variant.

Signed-off-by: Michael Riesch <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: Michael Riesch

drivers/phy/rockchip/phy-rockchip-inno-csidphy.c

@@ -67,6 +67,8 @@
 #define RK1808_CSIDPHY_CLK_CALIB_EN		0x168
 #define RK3568_CSIDPHY_CLK_CALIB_EN		0x168
 
+#define RESETS_MAX				2
+
 /*
  * The higher 16-bit of this register is used for write protection
  * only if BIT(x + 16) set to 1 the BIT(x) can be written.
@@ -127,14 +129,17 @@ struct dphy_drv_data {
 	const struct hsfreq_range *hsfreq_ranges;
 	int num_hsfreq_ranges;
 	const struct dphy_reg *grf_regs;
+	const char *const *resets;
+	unsigned int resets_num;
 };
 
 struct rockchip_inno_csidphy {
 	struct device *dev;
 	void __iomem *phy_base;
 	struct clk *pclk;
 	struct regmap *grf;
-	struct reset_control *rst;
+	struct reset_control_bulk_data resets[RESETS_MAX];
+	unsigned int resets_num;
 	const struct dphy_drv_data *drv_data;
 	struct phy_configure_opts_mipi_dphy config;
 	u8 hsfreq;
@@ -174,6 +179,10 @@ static const struct hsfreq_range rk3368_mipidphy_hsfreq_ranges[] = {
 	{1249, 0x0c}, {1349, 0x0d}, {1500, 0x0e}
 };
 
+static const char *const rk3368_reset_names[] = {
+	"apb"
+};
+
 static void rockchip_inno_csidphy_ths_settle(struct rockchip_inno_csidphy *priv,
 					     int hsfreq, int offset)
 {
@@ -344,6 +353,8 @@ static const struct dphy_drv_data rk1808_mipidphy_drv_data = {
 	.hsfreq_ranges = rk1808_mipidphy_hsfreq_ranges,
 	.num_hsfreq_ranges = ARRAY_SIZE(rk1808_mipidphy_hsfreq_ranges),
 	.grf_regs = rk1808_grf_dphy_regs,
+	.resets = rk3368_reset_names,
+	.resets_num = ARRAY_SIZE(rk3368_reset_names),
 };
 
 static const struct dphy_drv_data rk3326_mipidphy_drv_data = {
@@ -353,6 +364,8 @@ static const struct dphy_drv_data rk3326_mipidphy_drv_data = {
 	.hsfreq_ranges = rk3326_mipidphy_hsfreq_ranges,
 	.num_hsfreq_ranges = ARRAY_SIZE(rk3326_mipidphy_hsfreq_ranges),
 	.grf_regs = rk3326_grf_dphy_regs,
+	.resets = rk3368_reset_names,
+	.resets_num = ARRAY_SIZE(rk3368_reset_names),
 };
 
 static const struct dphy_drv_data rk3368_mipidphy_drv_data = {
@@ -362,6 +375,8 @@ static const struct dphy_drv_data rk3368_mipidphy_drv_data = {
 	.hsfreq_ranges = rk3368_mipidphy_hsfreq_ranges,
 	.num_hsfreq_ranges = ARRAY_SIZE(rk3368_mipidphy_hsfreq_ranges),
 	.grf_regs = rk3368_grf_dphy_regs,
+	.resets = rk3368_reset_names,
+	.resets_num = ARRAY_SIZE(rk3368_reset_names),
 };
 
 static const struct dphy_drv_data rk3568_mipidphy_drv_data = {
@@ -371,6 +386,8 @@ static const struct dphy_drv_data rk3568_mipidphy_drv_data = {
 	.hsfreq_ranges = rk1808_mipidphy_hsfreq_ranges,
 	.num_hsfreq_ranges = ARRAY_SIZE(rk1808_mipidphy_hsfreq_ranges),
 	.grf_regs = rk3568_grf_dphy_regs,
+	.resets = rk3368_reset_names,
+	.resets_num = ARRAY_SIZE(rk3368_reset_names),
 };
 
 static const struct of_device_id rockchip_inno_csidphy_match_id[] = {
@@ -404,6 +421,7 @@ static int rockchip_inno_csidphy_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct phy_provider *phy_provider;
 	struct phy *phy;
+	int ret;
 
 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
@@ -435,10 +453,18 @@ static int rockchip_inno_csidphy_probe(struct platform_device *pdev)
 		return PTR_ERR(priv->pclk);
 	}
 
-	priv->rst = devm_reset_control_get(dev, "apb");
-	if (IS_ERR(priv->rst)) {
+	if (priv->drv_data->resets_num > RESETS_MAX) {
+		dev_err(dev, "invalid number of resets\n");
+		return -EINVAL;
+	}
+	priv->resets_num = priv->drv_data->resets_num;
+	for (unsigned int i = 0; i < priv->resets_num; i++)
+		priv->resets[i].id = priv->drv_data->resets[i];
+	ret = devm_reset_control_bulk_get_exclusive(dev, priv->resets_num,
+						    priv->resets);
+	if (ret) {
 		dev_err(dev, "failed to get system reset control\n");
-		return PTR_ERR(priv->rst);
+		return ret;
 	}
 
 	phy = devm_phy_create(dev, NULL, &rockchip_inno_csidphy_ops);