clk: at91: clk-master: split master clock in pres and divider

Split master clock in 2 controlling block: one for prescaler one for
divider. This will allow referencing correctly the CPU clock and
master clock in device trees.

Reported-by: Eugen Hristev <eugen.hristev@microchip.com>
Fixes: a64862284f65 ("clk: at91: sam9x60: add support compatible with
CCF")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

4 files changed, 144 insertions, 50 deletions

diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 5d93e6a7e52..aec0bca7b3c 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -12,13 +12,15 @@
 #include <asm/processor.h>
 #include <clk-uclass.h>
 #include <common.h>
+#include <div64.h>
 #include <dm.h>
 #include <linux/clk-provider.h>
 #include <linux/clk/at91_pmc.h>
 
 #include "pmc.h"
 
-#define UBOOT_DM_CLK_AT91_MASTER		"at91-master-clk"
+#define UBOOT_DM_CLK_AT91_MASTER_PRES		"at91-master-clk-pres"
+#define UBOOT_DM_CLK_AT91_MASTER_DIV		"at91-master-clk-div"
 #define UBOOT_DM_CLK_AT91_SAMA7G5_MASTER	"at91-sama7g5-master-clk"
 
 #define MASTER_PRES_MASK	0x7
@@ -73,7 +75,7 @@ static int clk_master_enable(struct clk *clk)
 	return 0;
 }
 
-static ulong clk_master_get_rate(struct clk *clk)
+static ulong clk_master_pres_get_rate(struct clk *clk)
 {
 	struct clk_master *master = to_clk_master(clk);
 	const struct clk_master_layout *layout = master->layout;
@@ -81,7 +83,7 @@ static ulong clk_master_get_rate(struct clk *clk)
 						master->characteristics;
 	ulong rate = clk_get_parent_rate(clk);
 	unsigned int mckr;
-	u8 pres, div;
+	u8 pres;
 
 	if (!rate)
 		return 0;
@@ -90,29 +92,21 @@ static ulong clk_master_get_rate(struct clk *clk)
 	mckr &= layout->mask;
 
 	pres = (mckr >> layout->pres_shift) & MASTER_PRES_MASK;
-	div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
 
 	if (characteristics->have_div3_pres && pres == MASTER_PRES_MAX)
-		rate /= 3;
+		pres = 3;
 	else
-		rate >>= pres;
-
-	rate /= characteristics->divisors[div];
-
-	if (rate < characteristics->output.min)
-		pr_warn("master clk is underclocked");
-	else if (rate > characteristics->output.max)
-		pr_warn("master clk is overclocked");
+		pres = (1 << pres);
 
-	return rate;
+	return DIV_ROUND_CLOSEST_ULL(rate, pres);
 }
 
-static const struct clk_ops master_ops = {
+static const struct clk_ops master_pres_ops = {
 	.enable = clk_master_enable,
-	.get_rate = clk_master_get_rate,
+	.get_rate = clk_master_pres_get_rate,
 };
 
-struct clk *at91_clk_register_master(void __iomem *base,
+struct clk *at91_clk_register_master_pres(void __iomem *base,
 		const char *name, const char * const *parent_names,
 		int num_parents, const struct clk_master_layout *layout,
 		const struct clk_master_characteristics *characteristics,
@@ -140,7 +134,7 @@ struct clk *at91_clk_register_master(void __iomem *base,
 	pmc_read(master->base, master->layout->offset, &val);
 	clk = &master->clk;
 	clk->flags = CLK_GET_RATE_NOCACHE | CLK_IS_CRITICAL;
-	ret = clk_register(clk, UBOOT_DM_CLK_AT91_MASTER, name,
+	ret = clk_register(clk, UBOOT_DM_CLK_AT91_MASTER_PRES, name,
 			   parent_names[val & AT91_PMC_CSS]);
 	if (ret) {
 		kfree(master);
@@ -150,10 +144,81 @@ struct clk *at91_clk_register_master(void __iomem *base,
 	return clk;
 }
 
-U_BOOT_DRIVER(at91_master_clk) = {
-	.name = UBOOT_DM_CLK_AT91_MASTER,
+U_BOOT_DRIVER(at91_master_pres_clk) = {
+	.name = UBOOT_DM_CLK_AT91_MASTER_PRES,
+	.id = UCLASS_CLK,
+	.ops = &master_pres_ops,
+	.flags = DM_FLAG_PRE_RELOC,
+};
+
+static ulong clk_master_div_get_rate(struct clk *clk)
+{
+	struct clk_master *master = to_clk_master(clk);
+	const struct clk_master_layout *layout = master->layout;
+	const struct clk_master_characteristics *characteristics =
+						master->characteristics;
+	ulong rate = clk_get_parent_rate(clk);
+	unsigned int mckr;
+	u8 div;
+
+	if (!rate)
+		return 0;
+
+	pmc_read(master->base, master->layout->offset, &mckr);
+	mckr &= layout->mask;
+	div = (mckr >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
+
+	rate = DIV_ROUND_CLOSEST_ULL(rate, characteristics->divisors[div]);
+	if (rate < characteristics->output.min)
+		pr_warn("master clk is underclocked");
+	else if (rate > characteristics->output.max)
+		pr_warn("master clk is overclocked");
+
+	return rate;
+}
+
+static const struct clk_ops master_div_ops = {
+	.enable = clk_master_enable,
+	.get_rate = clk_master_div_get_rate,
+};
+
+struct clk *at91_clk_register_master_div(void __iomem *base,
+		const char *name, const char *parent_name,
+		const struct clk_master_layout *layout,
+		const struct clk_master_characteristics *characteristics)
+{
+	struct clk_master *master;
+	struct clk *clk;
+	int ret;
+
+	if (!base || !name || !parent_name || !layout || !characteristics)
+		return ERR_PTR(-EINVAL);
+
+	master = kzalloc(sizeof(*master), GFP_KERNEL);
+	if (!master)
+		return ERR_PTR(-ENOMEM);
+
+	master->layout = layout;
+	master->characteristics = characteristics;
+	master->base = base;
+	master->num_parents = 1;
+
+	clk = &master->clk;
+	clk->flags = CLK_GET_RATE_NOCACHE | CLK_IS_CRITICAL;
+	ret = clk_register(clk, UBOOT_DM_CLK_AT91_MASTER_DIV, name,
+			   parent_name);
+	if (ret) {
+		kfree(master);
+		clk = ERR_PTR(ret);
+	}
+
+	return clk;
+}
+
+U_BOOT_DRIVER(at91_master_div_clk) = {
+	.name = UBOOT_DM_CLK_AT91_MASTER_DIV,
 	.id = UCLASS_CLK,
-	.ops = &master_ops,
+	.ops = &master_div_ops,
 	.flags = DM_FLAG_PRE_RELOC,
 };
 
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index f07f535e492..2b4dd9a3d96 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -97,12 +97,17 @@ sam9x60_clk_register_frac_pll(void __iomem *base, const char *name,
 			const struct clk_pll_characteristics *characteristics,
 			const struct clk_pll_layout *layout, bool critical);
 struct clk *
-at91_clk_register_master(void __iomem *base, const char *name,
+at91_clk_register_master_pres(void __iomem *base, const char *name,
 			const char * const *parent_names, int num_parents,
 			const struct clk_master_layout *layout,
 			const struct clk_master_characteristics *characteristics,
 			const u32 *mux_table);
 struct clk *
+at91_clk_register_master_div(void __iomem *base,
+			const char *name, const char *parent_name,
+			const struct clk_master_layout *layout,
+			const struct clk_master_characteristics *characteristics);
+struct clk *
 at91_clk_sama7g5_register_master(void __iomem *base, const char *name,
 			const char * const *parent_names, int num_parents,
 			const u32 *mux_table, const u32 *clk_mux_table,
diff --git a/drivers/clk/at91/sam9x60.c b/drivers/clk/at91/sam9x60.c
index 9e9a643d62d..4d00ee2ddc3 100644
--- a/drivers/clk/at91/sam9x60.c
+++ b/drivers/clk/at91/sam9x60.c
@@ -31,7 +31,7 @@
  * @ID_PLL_A_FRAC:		APLL fractional clock identifier
  * @ID_PLL_A_DIV:		APLL divider clock identifier
 
- * @ID_MCK:			MCK clock identifier
+ * @ID_MCK_DIV:			MCK DIV clock identifier
 
  * @ID_UTMI:			UTMI clock identifier
 
@@ -43,6 +43,8 @@
  * @ID_DDR:			DDR system clock identifier
  * @ID_QSPI:			QSPI system clock identifier
  *
+ * @ID_MCK_PRES:		MCK PRES clock identifier
+ *
  * Note: if changing the values of this enums please sync them with
  *       device tree
  */
@@ -60,7 +62,7 @@ enum pmc_clk_ids {
 	ID_PLL_A_FRAC		= 9,
 	ID_PLL_A_DIV		= 10,
 
-	ID_MCK			= 11,
+	ID_MCK_DIV		= 11,
 
 	ID_UTMI			= 12,
 
@@ -73,6 +75,8 @@ enum pmc_clk_ids {
 	ID_DDR			= 17,
 	ID_QSPI			= 18,
 
+	ID_MCK_PRES		= 19,
+
 	ID_MAX,
 };
 
@@ -93,7 +97,8 @@ static const char *clk_names[] = {
 	[ID_MAINCK]		= "mainck",
 	[ID_PLL_U_DIV]		= "upll_divpmcck",
 	[ID_PLL_A_DIV]		= "plla_divpmcck",
-	[ID_MCK]		= "mck",
+	[ID_MCK_PRES]		= "mck_pres",
+	[ID_MCK_DIV]		= "mck_div",
 };
 
 /* Fractional PLL output range. */
@@ -260,10 +265,10 @@ static const struct {
 	u8 id;
 	u8 cid;
 } sam9x60_systemck[] = {
-	{ .n = "ddrck",		.p = "mck", .id = 2, .cid = ID_DDR, },
+	{ .n = "ddrck",		.p = "mck_pres", .id = 2, .cid = ID_DDR, },
 	{ .n = "pck0",		.p = "prog0",    .id = 8, .cid = ID_PCK0, },
 	{ .n = "pck1",		.p = "prog1",    .id = 9, .cid = ID_PCK1, },
-	{ .n = "qspick",	.p = "mck", .id = 19, .cid = ID_QSPI, },
+	{ .n = "qspick",	.p = "mck_pres", .id = 19, .cid = ID_QSPI, },
 };
 
 /**
@@ -508,7 +513,7 @@ static int sam9x60_clk_probe(struct udevice *dev)
 		clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, sam9x60_plls[i].cid), c);
 	}
 
-	/* Register MCK clock. */
+	/* Register MCK pres clock. */
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_MAINCK];
 	p[2] = clk_names[ID_PLL_A_DIV];
@@ -519,25 +524,36 @@ static int sam9x60_clk_probe(struct udevice *dev)
 	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_U_DIV);
 	prepare_mux_table(clkmuxallocs, clkmuxallocindex, tmpclkmux, cm, 4,
 			  fail);
-	c = at91_clk_register_master(base, clk_names[ID_MCK], p, 4, &mck_layout,
-				     &mck_characteristics, tmpclkmux);
+	c = at91_clk_register_master_pres(base, clk_names[ID_MCK_PRES], p, 4,
+					  &mck_layout, &mck_characteristics,
+					  tmpclkmux);
+	if (IS_ERR(c)) {
+		ret = PTR_ERR(c);
+		goto fail;
+	}
+	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK_PRES), c);
+
+	/* Register MCK div clock. */
+	c = at91_clk_register_master_div(base, clk_names[ID_MCK_DIV],
+					 clk_names[ID_MCK_PRES],
+					 &mck_layout, &mck_characteristics);
 	if (IS_ERR(c)) {
 		ret = PTR_ERR(c);
 		goto fail;
 	}
-	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK), c);
+	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK_DIV), c);
 
 	/* Register programmable clocks. */
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_TD_SLCK];
 	p[2] = clk_names[ID_MAINCK];
-	p[3] = clk_names[ID_MCK];
+	p[3] = clk_names[ID_MCK_DIV];
 	p[4] = clk_names[ID_PLL_A_DIV];
 	p[5] = clk_names[ID_PLL_U_DIV];
 	cm[0] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MD_SLCK);
 	cm[1] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_TD_SLCK);
 	cm[2] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MAINCK);
-	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK);
+	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK_DIV);
 	cm[4] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_A_DIV);
 	cm[5] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_U_DIV);
 	for (i = 0; i < ARRAY_SIZE(sam9x60_prog); i++) {
@@ -572,7 +588,7 @@ static int sam9x60_clk_probe(struct udevice *dev)
 	for (i = 0; i < ARRAY_SIZE(sam9x60_periphck); i++) {
 		c = at91_clk_register_sam9x5_peripheral(base, &pcr_layout,
 							sam9x60_periphck[i].n,
-							clk_names[ID_MCK],
+							clk_names[ID_MCK_DIV],
 							sam9x60_periphck[i].id,
 							&r);
 		if (IS_ERR(c)) {
@@ -587,7 +603,7 @@ static int sam9x60_clk_probe(struct udevice *dev)
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_TD_SLCK];
 	p[2] = clk_names[ID_MAINCK];
-	p[3] = clk_names[ID_MCK];
+	p[3] = clk_names[ID_MCK_DIV];
 	p[4] = clk_names[ID_PLL_A_DIV];
 	p[5] = clk_names[ID_PLL_U_DIV];
 	m[0] = 0;
@@ -599,7 +615,7 @@ static int sam9x60_clk_probe(struct udevice *dev)
 	cm[0] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MD_SLCK);
 	cm[1] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_TD_SLCK);
 	cm[2] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MAINCK);
-	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK);
+	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK_DIV);
 	cm[4] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_A_DIV);
 	cm[5] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_U_DIV);
 	for (i = 0; i < ARRAY_SIZE(sam9x60_gck); i++) {
diff --git a/drivers/clk/at91/sama7g5.c b/drivers/clk/at91/sama7g5.c
index c0d9271966d..d1ec3c82b54 100644
--- a/drivers/clk/at91/sama7g5.c
+++ b/drivers/clk/at91/sama7g5.c
@@ -44,7 +44,8 @@
  * @ID_PLL_ETH_FRAC:		Ethernet PLL fractional clock identifier
  * @ID_PLL_ETH_DIV:		Ethernet PLL divider clock identifier
 
- * @ID_MCK0:			MCK0 clock identifier
+ * @ID_MCK0_PRES:		MCK0 PRES clock identifier
+ * @ID_MCK0_DIV:		MCK0 DIV clock identifier
  * @ID_MCK1:			MCK1 clock identifier
  * @ID_MCK2:			MCK2 clock identifier
  * @ID_MCK3:			MCK3 clock identifier
@@ -95,7 +96,7 @@ enum pmc_clk_ids {
 	ID_PLL_ETH_FRAC		= 20,
 	ID_PLL_ETH_DIV		= 21,
 
-	ID_MCK0			= 22,
+	ID_MCK0_DIV		= 22,
 	ID_MCK1			= 23,
 	ID_MCK2			= 24,
 	ID_MCK3			= 25,
@@ -121,6 +122,8 @@ enum pmc_clk_ids {
 	ID_PCK6			= 42,
 	ID_PCK7			= 43,
 
+	ID_MCK0_PRES		= 44,
+
 	ID_MAX,
 };
 
@@ -147,7 +150,8 @@ static const char *clk_names[] = {
 	[ID_PLL_AUDIO_DIVPMC]	= "audiopll_divpmcck",
 	[ID_PLL_AUDIO_DIVIO]	= "audiopll_diviock",
 	[ID_PLL_ETH_DIV]	= "ethpll_divpmcck",
-	[ID_MCK0]		= "mck0",
+	[ID_MCK0_DIV]		= "mck0_div",
+	[ID_MCK0_PRES]		= "mck0_pres",
 };
 
 /* Fractional PLL output range. */
@@ -504,7 +508,7 @@ static const struct {
 	struct clk_range r;
 	u8 id;
 } sama7g5_periphck[] = {
-	{ .n = "pioA_clk",	.p = "mck0", .id = 11, },
+	{ .n = "pioA_clk",	.p = "mck0_div", .id = 11, },
 	{ .n = "sfr_clk",	.p = "mck1", .id = 19, },
 	{ .n = "hsmc_clk",	.p = "mck1", .id = 21, },
 	{ .n = "xdmac0_clk",	.p = "mck1", .id = 22, },
@@ -514,7 +518,7 @@ static const struct {
 	{ .n = "aes_clk",	.p = "mck1", .id = 27, },
 	{ .n = "tzaesbasc_clk",	.p = "mck1", .id = 28, },
 	{ .n = "asrc_clk",	.p = "mck1", .id = 30, .r = { .max = 200000000, }, },
-	{ .n = "cpkcc_clk",	.p = "mck0", .id = 32, },
+	{ .n = "cpkcc_clk",	.p = "mck0_div", .id = 32, },
 	{ .n = "csi_clk",	.p = "mck3", .id = 33, .r = { .max = 266000000, }, },
 	{ .n = "csi2dc_clk",	.p = "mck3", .id = 34, .r = { .max = 266000000, }, },
 	{ .n = "eic_clk",	.p = "mck1", .id = 37, },
@@ -1210,7 +1214,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 			sama7g5_plls[i].c));
 	}
 
-	/* Register MCK0 clock. */
+	/* Register MCK0_PRES clock. */
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_MAINCK];
 	p[2] = clk_names[ID_PLL_CPU_DIV];
@@ -1221,15 +1225,19 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_SYS_DIV);
 	prepare_mux_table(clkmuxallocs, clkmuxallocindex, tmpclkmux, cm, 2,
 			  fail);
-	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0),
-		at91_clk_register_master(base, clk_names[ID_MCK0], p,
+	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0_PRES),
+		at91_clk_register_master_pres(base, clk_names[ID_MCK0_PRES], p,
 		4, &mck0_layout, &mck0_characteristics, tmpclkmux));
 
+	clk_dm(AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0_DIV),
+		at91_clk_register_master_div(base, clk_names[ID_MCK0_DIV],
+		clk_names[ID_MCK0_PRES], &mck0_layout, &mck0_characteristics));
+
 	/* Register MCK1-4 clocks. */
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_TD_SLCK];
 	p[2] = clk_names[ID_MAINCK];
-	p[3] = clk_names[ID_MCK0];
+	p[3] = clk_names[ID_MCK0_DIV];
 	m[0] = 0;
 	m[1] = 1;
 	m[2] = 2;
@@ -1237,7 +1245,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	cm[0] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MD_SLCK);
 	cm[1] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_TD_SLCK);
 	cm[2] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MAINCK);
-	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0);
+	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0_DIV);
 	for (i = 0; i < ARRAY_SIZE(sama7g5_mckx); i++) {
 		for (j = 0; j < sama7g5_mckx[i].ep_count; j++) {
 			p[4 + j] = sama7g5_mckx[i].ep[j];
@@ -1267,7 +1275,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_TD_SLCK];
 	p[2] = clk_names[ID_MAINCK];
-	p[3] = clk_names[ID_MCK0];
+	p[3] = clk_names[ID_MCK0_DIV];
 	p[4] = clk_names[ID_PLL_SYS_DIV];
 	p[5] = clk_names[ID_PLL_DDR_DIV];
 	p[6] = clk_names[ID_PLL_IMG_DIV];
@@ -1277,7 +1285,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	cm[0] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MD_SLCK);
 	cm[1] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_TD_SLCK);
 	cm[2] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MAINCK);
-	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0);
+	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0_DIV);
 	cm[4] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_SYS_DIV);
 	cm[5] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_DDR_DIV);
 	cm[6] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_PLL_IMG_DIV);
@@ -1315,7 +1323,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	p[0] = clk_names[ID_MD_SLCK];
 	p[1] = clk_names[ID_TD_SLCK];
 	p[2] = clk_names[ID_MAINCK];
-	p[3] = clk_names[ID_MCK0];
+	p[3] = clk_names[ID_MCK0_DIV];
 	m[0] = 0;
 	m[1] = 1;
 	m[2] = 2;
@@ -1323,7 +1331,7 @@ static int sama7g5_clk_probe(struct udevice *dev)
 	cm[0] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MD_SLCK);
 	cm[1] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_TD_SLCK);
 	cm[2] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MAINCK);
-	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0);
+	cm[3] = AT91_TO_CLK_ID(PMC_TYPE_CORE, ID_MCK0_DIV);
 	for (i = 0; i < ARRAY_SIZE(sama7g5_gck); i++) {
 		for (j = 0; j < sama7g5_gck[i].ep_count; j++) {
 			p[4 + j] = sama7g5_gck[i].ep[j];