[PATCH v4 4/4] clk: at91: sckc: add support for SAM9X60

[<Claudiu.Beznea@microchip.com>]

From: Claudiu Beznea <claudiu.beznea@microchip.com>

Add support for SAM9X60's slow clock.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
---
 drivers/clk/at91/sckc.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 74 insertions(+)

diff --git a/drivers/clk/at91/sckc.c b/drivers/clk/at91/sckc.c
index ab18b1da269f..1f0f1cd06387 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -410,6 +410,80 @@ static void __init of_sama5d3_sckc_setup(struct device_node *np)
 CLK_OF_DECLARE(sama5d3_clk_sckc, "atmel,sama5d3-sckc",
 	       of_sama5d3_sckc_setup);
 
+static const struct clk_slow_bits at91sam9x60_bits = {
+	.cr_osc32en = BIT(1),
+	.cr_osc32byp = BIT(2),
+	.cr_oscsel = BIT(24),
+};
+
+static void __init of_sam9x60_sckc_setup(struct device_node *np)
+{
+	void __iomem *regbase = of_iomap(np, 0);
+	struct clk_hw_onecell_data *clk_data;
+	struct clk_hw *slow_rc, *slow_osc;
+	const char *xtal_name;
+	const char *parent_names[2] = { "slow_rc_osc", "slow_osc" };
+	bool bypass;
+	int ret;
+
+	if (!regbase)
+		return;
+
+	slow_rc = clk_hw_register_fixed_rate(NULL, parent_names[0], NULL, 0,
+					     32768);
+	if (IS_ERR(slow_rc))
+		return;
+
+	xtal_name = of_clk_get_parent_name(np, 0);
+	if (!xtal_name)
+		goto unregister_slow_rc;
+
+	bypass = of_property_read_bool(np, "atmel,osc-bypass");
+	slow_osc = at91_clk_register_slow_osc(regbase, parent_names[1],
+					      xtal_name, 5000000, bypass,
+					      &at91sam9x60_bits);
+	if (IS_ERR(slow_osc))
+		goto unregister_slow_rc;
+
+	clk_data = kzalloc(sizeof(*clk_data) + (2 * sizeof(struct clk_hw *)),
+			   GFP_KERNEL);
+	if (!clk_data)
+		goto unregister_slow_osc;
+
+	/* MD_SLCK and TD_SLCK. */
+	clk_data->num = 2;
+	clk_data->hws[0] = clk_hw_register_fixed_rate(NULL, "md_slck",
+						      parent_names[0],
+						      0, 32768);
+	if (IS_ERR(clk_data->hws[0]))
+		goto clk_data_free;
+
+	clk_data->hws[1] = at91_clk_register_sam9x5_slow(regbase, "td_slck",
+							 parent_names, 2,
+							 &at91sam9x60_bits);
+	if (IS_ERR(clk_data->hws[1]))
+		goto unregister_md_slck;
+
+	ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, clk_data);
+	if (WARN_ON(ret))
+		goto unregister_td_slck;
+
+	return;
+
+unregister_td_slck:
+	clk_hw_unregister(clk_data->hws[1]);
+unregister_md_slck:
+	clk_hw_unregister(clk_data->hws[0]);
+clk_data_free:
+	kfree(clk_data);
+unregister_slow_osc:
+	clk_hw_unregister(slow_osc);
+unregister_slow_rc:
+	clk_hw_unregister(slow_rc);
+}
+CLK_OF_DECLARE(sam9x60_clk_sckc, "microchip,sam9x60-sckc",
+	       of_sam9x60_sckc_setup);
+
 static int clk_sama5d4_slow_osc_prepare(struct clk_hw *hw)
 {
 	struct clk_sama5d4_slow_osc *osc = to_clk_sama5d4_slow_osc(hw);
-- 
2.7.4