diff mbox series

[v2,15/21] clk: at91: clk-utmi: add support for sama7g5

Message ID 1596640325-20014-16-git-send-email-claudiu.beznea@microchip.com
State Superseded
Delegated to: Eugen Hristev
Headers show
Series clk: at91: add sama7g5 support | expand

Commit Message

Claudiu Beznea Aug. 5, 2020, 3:11 p.m. UTC 
Add UTMI support for SAMA7G5. SAMA7G5's UTMI control is done via
XTALF register. Values written at bits 2..0 in this register
correspond to the on board crystal oscillator frequency.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
---
 drivers/clk/at91/clk-utmi.c | 71 ++++++++++++++++++++++++++++++++++++++++++++-
 drivers/clk/at91/pmc.h      |  3 ++
 2 files changed, 73 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
index b60fd35b6b6a..7c8bcfb51dba 100644
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -20,7 +20,8 @@ 
 
 #include "pmc.h"
 
-#define UBOOT_DM_CLK_AT91_UTMI		"at91-utmi-clk"
+#define UBOOT_DM_CLK_AT91_UTMI			"at91-utmi-clk"
+#define UBOOT_DM_CLK_AT91_SAMA7G5_UTMI		"at91-sama7g5-utmi-clk"
 
 /*
  * The purpose of this clock is to generate a 480 MHz signal. A different
@@ -163,3 +164,71 @@  U_BOOT_DRIVER(at91_utmi_clk) = {
 	.ops = &utmi_ops,
 	.flags = DM_FLAG_PRE_RELOC,
 };
+
+static int clk_utmi_sama7g5_enable(struct clk *clk)
+{
+	struct clk_utmi *utmi = to_clk_utmi(clk);
+	ulong parent_rate = clk_get_parent_rate(clk);
+	unsigned int val;
+
+	switch (parent_rate) {
+	case 16000000:
+		val = 0;
+		break;
+	case 20000000:
+		val = 2;
+		break;
+	case 24000000:
+		val = 3;
+		break;
+	case 32000000:
+		val = 5;
+		break;
+	default:
+		debug("UTMICK: unsupported main_xtal rate\n");
+		return -EINVAL;
+	}
+
+	pmc_write(utmi->base, AT91_PMC_XTALF, val);
+
+	return 0;
+}
+
+static const struct clk_ops sama7g5_utmi_ops = {
+	.enable = clk_utmi_sama7g5_enable,
+	.get_rate = clk_utmi_get_rate,
+};
+
+struct clk *at91_clk_sama7g5_register_utmi(void __iomem *base,
+		const char *name, const char *parent_name)
+{
+	struct clk_utmi *utmi;
+	struct clk *clk;
+	int ret;
+
+	if (!base || !name || !parent_name)
+		return ERR_PTR(-EINVAL);
+
+	utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);
+	if (!utmi)
+		return ERR_PTR(-ENOMEM);
+
+	utmi->base = base;
+
+	clk = &utmi->clk;
+	ret = clk_register(clk, UBOOT_DM_CLK_AT91_SAMA7G5_UTMI, name,
+			   parent_name);
+	if (ret) {
+		kfree(utmi);
+		clk = ERR_PTR(ret);
+	}
+
+	return clk;
+}
+
+U_BOOT_DRIVER(at91_sama7g5_utmi_clk) = {
+	.name = UBOOT_DM_CLK_AT91_SAMA7G5_UTMI,
+	.id = UCLASS_CLK,
+	.ops = &sama7g5_utmi_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index 264b36c7b4f5..d34005f6986c 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -88,6 +88,9 @@  at91_clk_sama7g5_register_master(void __iomem *base, const char *name,
 struct clk *
 at91_clk_register_utmi(void __iomem *base, struct udevice *dev,
 			const char *name, const char *parent_name);
+struct clk *
+at91_clk_sama7g5_register_utmi(void __iomem *base, const char *name,
+			const char *parent_name);
 
 int at91_clk_mux_val_to_index(const u32 *table, u32 num_parents, u32 val);
 int at91_clk_mux_index_to_val(const u32 *table, u32 num_parents, u32 index);