drivers/phy/rockchip/phy-rockchip-dp.c

Source file repositories/reference/linux-study-clean/drivers/phy/rockchip/phy-rockchip-dp.c

File Facts

System
Linux kernel
Corpus path
drivers/phy/rockchip/phy-rockchip-dp.c
Extension
.c
Size
3644 bytes
Lines
152
Domain
Driver Families
Bucket
drivers/phy
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct rockchip_dp_phy {
	struct device  *dev;
	struct regmap  *grf;
	struct clk     *phy_24m;
};

static int rockchip_set_phy_state(struct phy *phy, bool enable)
{
	struct rockchip_dp_phy *dp = phy_get_drvdata(phy);
	int ret;

	if (enable) {
		ret = regmap_write(dp->grf, GRF_SOC_CON12,
				   GRF_EDP_PHY_SIDDQ_HIWORD_MASK |
				   GRF_EDP_PHY_SIDDQ_ON);
		if (ret < 0) {
			dev_err(dp->dev, "Can't enable PHY power %d\n", ret);
			return ret;
		}

		ret = clk_prepare_enable(dp->phy_24m);
	} else {
		clk_disable_unprepare(dp->phy_24m);

		ret = regmap_write(dp->grf, GRF_SOC_CON12,
				   GRF_EDP_PHY_SIDDQ_HIWORD_MASK |
				   GRF_EDP_PHY_SIDDQ_OFF);
	}

	return ret;
}

static int rockchip_dp_phy_power_on(struct phy *phy)
{
	return rockchip_set_phy_state(phy, true);
}

static int rockchip_dp_phy_power_off(struct phy *phy)
{
	return rockchip_set_phy_state(phy, false);
}

static const struct phy_ops rockchip_dp_phy_ops = {
	.power_on	= rockchip_dp_phy_power_on,
	.power_off	= rockchip_dp_phy_power_off,
	.owner		= THIS_MODULE,
};

static int rockchip_dp_phy_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct device_node *np = dev->of_node;
	struct phy_provider *phy_provider;
	struct rockchip_dp_phy *dp;
	struct phy *phy;
	int ret;

	if (!np)
		return -ENODEV;

	if (!dev->parent || !dev->parent->of_node)
		return -ENODEV;

	dp = devm_kzalloc(dev, sizeof(*dp), GFP_KERNEL);
	if (!dp)
		return -ENOMEM;

	dp->dev = dev;

	dp->phy_24m = devm_clk_get(dev, "24m");
	if (IS_ERR(dp->phy_24m)) {
		dev_err(dev, "cannot get clock 24m\n");
		return PTR_ERR(dp->phy_24m);
	}

	ret = clk_set_rate(dp->phy_24m, 24000000);
	if (ret < 0) {
		dev_err(dp->dev, "cannot set clock phy_24m %d\n", ret);
		return ret;
	}

	dp->grf = syscon_node_to_regmap(dev->parent->of_node);
	if (IS_ERR(dp->grf)) {
		dev_err(dev, "rk3288-dp needs the General Register Files syscon\n");
		return PTR_ERR(dp->grf);
	}

	ret = regmap_write(dp->grf, GRF_SOC_CON12, GRF_EDP_REF_CLK_SEL_INTER |
			   GRF_EDP_REF_CLK_SEL_INTER_HIWORD_MASK);
	if (ret != 0) {

Annotation

Implementation Notes