[PATCH 4/5] phy: rockchip: naneng-combphy: Add RK3528 support

Yao Zi
2025-05-08T13:53:35Z

Rockchip RK3528 integrates one naneng-combphy that is able to operate in
PCIe and USB3 mode. The control logic is similar to previous variants of
naneng-combphy but the register layout is apperantly different from the
RK3568 one.

Signed-off-by: Yao Zi <ziyao@disroot.org>
---
.../rockchip/phy-rockchip-naneng-combphy.c | 180 +++++++++++++++++-
1 file changed, 179 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c b/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
index 1d1c7723584b..7c92f7ac3c7f 100644
--- a/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
+++ b/drivers/phy/rockchip/phy-rockchip-naneng-combphy.c
@@ -20,7 +20,40 @@
#define REF_CLOCK_25MHz (25 * HZ_PER_MHZ)
#define REF_CLOCK_100MHz (100 * HZ_PER_MHZ)

-/* COMBO PHY REG */
+/* RK3528 COMBO PHY REG */
+#define RK3528_PHYREG6 0x18
+#define RK3528_PHYREG6_PLL_KVCO GENMASK(12, 10)
+#define RK3528_PHYREG6_PLL_KVCO_VALUE 0x2
+#define RK3528_PHYREG6_SSC_DIR GENMASK(5, 4)
+#define RK3528_PHYREG6_SSC_UPWARD 0
+#define RK3528_PHYREG6_SSC_DOWNWARD 1
+#define RK3528_PHYREG40 0x100
+#define RK3528_PHYREG40_SSC_EN BIT(20)
+#define RK3528_PHYREG40_SSC_CNT GENMASK(10, 0)
+#define RK3528_PHYREG40_SSC_CNT_VALUE 0x17d
+#define RK3528_PHYREG42 0x108
+#define RK3528_PHYREG42_CKDRV_CLK_SEL BIT(29)
+#define RK3528_PHYREG42_CKDRV_CLK_PLL 0
+#define RK3528_PHYREG42_CKDRV_CLK_CKRCV 1
+#define RK3528_PHYREG42_PLL_LPF_R1_ADJ GENMASK(10, 7)
+#define RK3528_PHYREG42_PLL_LPF_R1_ADJ_VALUE 0x9
+#define RK3528_PHYREG42_PLL_CHGPUMP_CUR_ADJ GENMASK(6, 4)
+#define RK3528_PHYREG42_PLL_CHGPUMP_CUR_ADJ_VALUE 0x7
+#define RK3528_PHYREG42_PLL_KVCO_ADJ GENMASK(2, 0)
+#define RK3528_PHYREG42_PLL_KVCO_ADJ_VALUE 0x0
+#define RK3528_PHYREG80 0x200
+#define RK3528_PHYREG80_CTLE_EN BIT(17)
+#define RK3528_PHYREG81 0x204
+#define RK3528_PHYREG81_CDR_PHASE_PATH_GAIN_2X BIT(5)
+#define RK3528_PHYREG81_SLEW_RATE_CTRL GENMASK(2, 0)
+#define RK3528_PHYREG81_SLEW_RATE_CTRL_SLOW 0x7
+#define RK3528_PHYREG83 0x20c
+#define RK3528_PHYREG83_RX_SQUELCH GENMASK(2, 0)
+#define RK3528_PHYREG83_RX_SQUELCH_VALUE 0x6
+#define RK3528_PHYREG86 0x218
+#define RK3528_PHYREG86_RTERM_DET_CLK_EN BIT(14)
+
+/* RK3568 COMBO PHY REG */
#define RK3568_PHYREG6 0x14
#define RK3568_PHYREG6_PLL_DIV_MASK GENMASK(7, 6)
#define RK3568_PHYREG6_PLL_DIV_SHIFT 6
@@ -398,6 +431,147 @@ static int rockchip_combphy_probe(struct platform_device *pdev)
return PTR_ERR_OR_ZERO(phy_provider);
}

+static int rk3528_combphy_cfg(struct rockchip_combphy_priv *priv)
+{
+ const struct rockchip_combphy_grfcfg *cfg = priv->cfg->grfcfg;
+ unsigned long rate;
+ u32 val;
+
+ /* Set SSC downward spread spectrum */
+ val = FIELD_PREP(RK3528_PHYREG6_SSC_DIR, RK3528_PHYREG6_SSC_DOWNWARD);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG6_SSC_DIR, val, RK3528_PHYREG6);
+
+ switch (priv->type) {
+ case PHY_TYPE_PCIE:
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->con0_for_pcie, true);
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->con1_for_pcie, true);
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->con2_for_pcie, true);
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->con3_for_pcie, true);
+ break;
+ case PHY_TYPE_USB3:
+ /* Enable adaptive CTLE for USB3.0 Rx */
+ rockchip_combphy_updatel(priv, RK3528_PHYREG80_CTLE_EN, RK3528_PHYREG80_CTLE_EN,
+ RK3528_PHYREG80);
+
+ /* Set slow slew rate control for PI */
+ val = FIELD_PREP(RK3528_PHYREG81_SLEW_RATE_CTRL,
+ RK3528_PHYREG81_SLEW_RATE_CTRL_SLOW);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG81_SLEW_RATE_CTRL, val,
+ RK3528_PHYREG81);
+
+ /* Set CDR phase path with 2x gain */
+ rockchip_combphy_updatel(priv, RK3528_PHYREG81_CDR_PHASE_PATH_GAIN_2X,
+ RK3528_PHYREG81_CDR_PHASE_PATH_GAIN_2X, RK3528_PHYREG81);
+
+ /* Set Rx squelch input filler bandwidth */
+ val = FIELD_PREP(RK3528_PHYREG83_RX_SQUELCH, RK3528_PHYREG83_RX_SQUELCH_VALUE);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG83_RX_SQUELCH, val, RK3528_PHYREG83);
+
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_txcomp_sel, false);
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_txelec_sel, false);
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->usb_mode_set, true);
+ break;
+ default:
+ dev_err(priv->dev, "incompatible PHY type\n");
+ return -EINVAL;
+ }
+
+ rate = clk_get_rate(priv->refclk);
+
+ switch (rate) {
+ case REF_CLOCK_24MHz:
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_clk_24m, true);
+ if (priv->type == PHY_TYPE_USB3) {
+ /* Set ssc_cnt[10:0]=00101111101 & 31.5KHz */
+ val = FIELD_PREP(RK3528_PHYREG40_SSC_CNT, RK3528_PHYREG40_SSC_CNT_VALUE);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG40_SSC_CNT, val,
+ RK3528_PHYREG40);
+ } else if (priv->type == PHY_TYPE_PCIE) {
+ /* tx_trim[14]=1, Enable the counting clock of the rterm detect */
+ rockchip_combphy_updatel(priv, RK3528_PHYREG86_RTERM_DET_CLK_EN,
+ RK3528_PHYREG86_RTERM_DET_CLK_EN, RK3528_PHYREG86);
+ }
+ break;
+ case REF_CLOCK_100MHz:
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_clk_100m, true);
+ if (priv->type == PHY_TYPE_PCIE) {
+ /* PLL KVCO tuning fine */
+ val = FIELD_PREP(RK3528_PHYREG6_PLL_KVCO, RK3528_PHYREG6_PLL_KVCO_VALUE);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG6_PLL_KVCO, val,
+ RK3528_PHYREG6);
+
+ /* su_trim[6:4]=111, [10:7]=1001, [2:0]=000, swing 650mv */
+ writel(0x570804f0, priv->mmio + RK3528_PHYREG42);
+ }
+ break;
+ default:
+ dev_err(priv->dev, "Unsupported rate: %lu\n", rate);
+ return -EINVAL;
+ }
+
+ if (device_property_read_bool(priv->dev, "rockchip,ext-refclk")) {
+ rockchip_combphy_param_write(priv->phy_grf, &cfg->pipe_clk_ext, true);
+
+ if (priv->type == PHY_TYPE_PCIE && rate == REF_CLOCK_100MHz) {
+ val = FIELD_PREP(RK3528_PHYREG42_CKDRV_CLK_SEL,
+ RK3528_PHYREG42_CKDRV_CLK_CKRCV);
+ val |= FIELD_PREP(RK3528_PHYREG42_PLL_LPF_R1_ADJ,
+ RK3528_PHYREG42_PLL_LPF_R1_ADJ_VALUE);
+ val |= FIELD_PREP(RK3528_PHYREG42_PLL_CHGPUMP_CUR_ADJ,
+ RK3528_PHYREG42_PLL_CHGPUMP_CUR_ADJ_VALUE);
+ val |= FIELD_PREP(RK3528_PHYREG42_PLL_KVCO_ADJ,
+ RK3528_PHYREG42_PLL_KVCO_ADJ_VALUE);
+ rockchip_combphy_updatel(priv,
+ RK3528_PHYREG42_CKDRV_CLK_SEL |
+ RK3528_PHYREG42_PLL_LPF_R1_ADJ |
+ RK3528_PHYREG42_PLL_CHGPUMP_CUR_ADJ |
+ RK3528_PHYREG42_PLL_KVCO_ADJ,
+ val, RK3528_PHYREG42);
+
+ val = FIELD_PREP(RK3528_PHYREG6_PLL_KVCO, RK3528_PHYREG6_PLL_KVCO_VALUE);
+ rockchip_combphy_updatel(priv, RK3528_PHYREG6_PLL_KVCO, val,
+ RK3528_PHYREG6);
+ }
+ }
+
+ if (priv->type == PHY_TYPE_PCIE) {
+ if (device_property_read_bool(priv->dev, "rockchip,enable-ssc"))
+ rockchip_combphy_updatel(priv, RK3528_PHYREG40_SSC_EN,
+ RK3528_PHYREG40_SSC_EN, RK3528_PHYREG40);
+ }
+
+ return 0;
+}
+
+static const struct rockchip_combphy_grfcfg rk3528_combphy_grfcfgs = {
+ /* pipe-phy-grf */
+ .pcie_mode_set = { 0x0000, 5, 0, 0x00, 0x11 },
+ .usb_mode_set = { 0x0000, 5, 0, 0x00, 0x04 },
+ .pipe_rxterm_set = { 0x0000, 12, 12, 0x00, 0x01 },
+ .pipe_txelec_set = { 0x0004, 1, 1, 0x00, 0x01 },
+ .pipe_txcomp_set = { 0x0004, 4, 4, 0x00, 0x01 },
+ .pipe_clk_24m = { 0x0004, 14, 13, 0x00, 0x00 },
+ .pipe_clk_100m = { 0x0004, 14, 13, 0x00, 0x02 },
+ .pipe_rxterm_sel = { 0x0008, 8, 8, 0x00, 0x01 },
+ .pipe_txelec_sel = { 0x0008, 12, 12, 0x00, 0x01 },
+ .pipe_txcomp_sel = { 0x0008, 15, 15, 0x00, 0x01 },
+ .pipe_clk_ext = { 0x000c, 9, 8, 0x02, 0x01 },
+ .pipe_phy_status = { 0x0034, 6, 6, 0x01, 0x00 },
+ .con0_for_pcie = { 0x0000, 15, 0, 0x00, 0x110 },
+ .con1_for_pcie = { 0x0004, 15, 0, 0x00, 0x00 },
+ .con2_for_pcie = { 0x0008, 15, 0, 0x00, 0x101 },
+ .con3_for_pcie = { 0x000c, 15, 0, 0x00, 0x0200 },
+};
+
+static const struct rockchip_combphy_cfg rk3528_combphy_cfgs = {
+ .num_phys = 1,
+ .phy_ids = {
+ 0xffdc0000,
+ },
+ .grfcfg = &rk3528_combphy_grfcfgs,
+ .combphy_cfg = rk3528_combphy_cfg,
+};
+
static int rk3562_combphy_cfg(struct rockchip_combphy_priv *priv)
{
const struct rockchip_combphy_grfcfg *cfg = priv->cfg->grfcfg;
@@ -1213,6 +1387,10 @@ static const struct rockchip_combphy_cfg rk3588_combphy_cfgs = {
};

static const struct of_device_id rockchip_combphy_of_match[] = {
+ {
+ .compatible = "rockchip,rk3528-naneng-combphy",
+ .data = &rk3528_combphy_cfgs,
+ },
{
.compatible = "rockchip,rk3562-naneng-combphy",
.data = &rk3562_combphy_cfgs,
--
2.49.0