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Date:   Thu, 24 Dec 2020 17:12:49 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, Nishanth Menon <nm@...com>,
        Swapnil Jakhade <sjakhade@...ence.com>,
        Peter Rosin <peda@...ntia.se>
CC:     <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 6/7] phy: ti: j721e-wiz: Enable reference clock output in cmn_refclk_<p/m>

cmn_refclk_<p/m> lines in Torrent SERDES is used for connecting external
reference clock. cmn_refclk_<p/m> can also be configured to output the
reference clock. In order to drive the refclk out from the SERDES
(Cadence Torrent), PHY_EN_REFCLK should be set in SERDES_RST of WIZ.
Model PHY_EN_REFCLK as a clock, so that platforms like AM642 EVM can
enable it.

Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/ti/phy-j721e-wiz.c | 115 +++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)

diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
index 08acfab1ebe6..d60a9a01a8b2 100644
--- a/drivers/phy/ti/phy-j721e-wiz.c
+++ b/drivers/phy/ti/phy-j721e-wiz.c
@@ -54,6 +54,7 @@ enum wiz_refclk_div_sel {
 
 static const struct reg_field por_en = REG_FIELD(WIZ_SERDES_CTRL, 31, 31);
 static const struct reg_field phy_reset_n = REG_FIELD(WIZ_SERDES_RST, 31, 31);
+static const struct reg_field phy_en_refclk = REG_FIELD(WIZ_SERDES_RST, 30, 30);
 static const struct reg_field pll1_refclk_mux_sel =
 					REG_FIELD(WIZ_SERDES_RST, 29, 29);
 static const struct reg_field pll0_refclk_mux_sel =
@@ -141,6 +142,15 @@ struct wiz_clk_div_sel {
 	const char		*node_name;
 };
 
+struct wiz_phy_en_refclk {
+	struct clk_hw		hw;
+	struct regmap_field	*phy_en_refclk;
+	struct clk_init_data	clk_data;
+};
+
+#define to_wiz_phy_en_refclk(_hw)	\
+			container_of(_hw, struct wiz_phy_en_refclk, hw)
+
 static struct wiz_clk_mux_sel clk_mux_sel_16g[] = {
 	{
 		/*
@@ -214,6 +224,7 @@ struct wiz {
 	unsigned int		clk_div_sel_num;
 	struct regmap_field	*por_en;
 	struct regmap_field	*phy_reset_n;
+	struct regmap_field	*phy_en_refclk;
 	struct regmap_field	*p_enable[WIZ_MAX_LANES];
 	struct regmap_field	*p_align[WIZ_MAX_LANES];
 	struct regmap_field	*p_raw_auto_start[WIZ_MAX_LANES];
@@ -450,9 +461,96 @@ static int wiz_regfield_init(struct wiz *wiz)
 		return PTR_ERR(wiz->typec_ln10_swap);
 	}
 
+	wiz->phy_en_refclk = devm_regmap_field_alloc(dev, regmap,
+						     phy_en_refclk);
+	if (IS_ERR(wiz->phy_en_refclk)) {
+		dev_err(dev, "PHY_EN_REFCLK reg field init failed\n");
+		return PTR_ERR(wiz->phy_en_refclk);
+	}
+
 	return 0;
 }
 
+static int wiz_phy_en_refclk_enable(struct clk_hw *hw)
+{
+	struct wiz_phy_en_refclk *wiz_phy_en_refclk = to_wiz_phy_en_refclk(hw);
+	struct regmap_field *phy_en_refclk = wiz_phy_en_refclk->phy_en_refclk;
+
+	regmap_field_write(phy_en_refclk, 1);
+
+	return 0;
+}
+
+static void wiz_phy_en_refclk_disable(struct clk_hw *hw)
+{
+	struct wiz_phy_en_refclk *wiz_phy_en_refclk = to_wiz_phy_en_refclk(hw);
+	struct regmap_field *phy_en_refclk = wiz_phy_en_refclk->phy_en_refclk;
+
+	regmap_field_write(phy_en_refclk, 0);
+}
+
+static int wiz_phy_en_refclk_is_enabled(struct clk_hw *hw)
+{
+	struct wiz_phy_en_refclk *wiz_phy_en_refclk = to_wiz_phy_en_refclk(hw);
+	struct regmap_field *phy_en_refclk = wiz_phy_en_refclk->phy_en_refclk;
+	int val;
+
+	regmap_field_read(phy_en_refclk, &val);
+
+	return !!val;
+}
+
+static const struct clk_ops wiz_phy_en_refclk_ops = {
+	.enable = wiz_phy_en_refclk_enable,
+	.disable = wiz_phy_en_refclk_disable,
+	.is_enabled = wiz_phy_en_refclk_is_enabled,
+};
+
+static int wiz_phy_en_refclk_register(struct wiz *wiz, struct device_node *node,
+				      struct regmap_field *phy_en_refclk)
+{
+	struct wiz_phy_en_refclk *wiz_phy_en_refclk;
+	struct device *dev = wiz->dev;
+	struct clk_init_data *init;
+	unsigned int num_parents;
+	const char *parent_name;
+	char clk_name[100];
+	struct clk *clk;
+	int ret;
+
+	wiz_phy_en_refclk = devm_kzalloc(dev, sizeof(*wiz_phy_en_refclk),
+					 GFP_KERNEL);
+	if (!wiz_phy_en_refclk)
+		return -ENOMEM;
+
+	num_parents = of_clk_get_parent_count(node);
+	parent_name = of_clk_get_parent_name(node, 0);
+
+	snprintf(clk_name, sizeof(clk_name), "%s_%s", dev_name(dev),
+		 node->name);
+
+	init = &wiz_phy_en_refclk->clk_data;
+
+	init->ops = &wiz_phy_en_refclk_ops;
+	init->flags = 0;
+	init->parent_names = parent_name ? &parent_name : NULL;
+	init->num_parents = num_parents ? 1 : 0;
+	init->name = clk_name;
+
+	wiz_phy_en_refclk->phy_en_refclk = phy_en_refclk;
+	wiz_phy_en_refclk->hw.init = init;
+
+	clk = devm_clk_register(dev, &wiz_phy_en_refclk->hw);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
+	if (ret)
+		dev_err(dev, "Fail to add clock provider: %s\n", clk_name);
+
+	return ret;
+}
+
 static u8 wiz_clk_mux_get_parent(struct clk_hw *hw)
 {
 	struct wiz_clk_mux *mux = to_wiz_clk_mux(hw);
@@ -713,6 +811,20 @@ static int wiz_clock_init(struct wiz *wiz, struct device_node *node)
 		of_node_put(clk_node);
 	}
 
+	clk_node = of_get_child_by_name(node, "phy-en-refclk");
+	if (clk_node) {
+		ret = wiz_phy_en_refclk_register(wiz, clk_node,
+						 wiz->phy_en_refclk);
+		if (ret) {
+			dev_err(dev, "Failed to register %s clock\n",
+				node_name);
+			of_node_put(clk_node);
+			goto err;
+		}
+
+		of_node_put(clk_node);
+	}
+
 	return 0;
 err:
 	wiz_clock_cleanup(wiz, node);
@@ -828,6 +940,9 @@ static int wiz_get_lane_phy_types(struct device *dev, struct wiz *wiz)
 		      of_node_name_eq(subnode, "link")))
 			continue;
 
+		if (!(of_node_name_eq(subnode, "link")))
+			continue;
+
 		ret = of_property_read_u32(subnode, "reg", &reg);
 		if (ret) {
 			dev_err(dev,
-- 
2.17.1

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