[PATCH v3 4/4] clk: at91: sckc: add support for SAM9X60

Claudiu.Beznea
2019-05-10T11:23:40Z

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

Add support for SAM9X60's slow clock.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.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 2a4ac548de80..2c410f41b413 100644
--- a/drivers/clk/at91/sckc.c
+++ b/drivers/clk/at91/sckc.c
@@ -415,6 +415,80 @@ 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