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authorClaudiu Beznea <claudiu.beznea@microchip.com>2020-07-22 10:38:25 +0300
committerStephen Boyd <sboyd@kernel.org>2020-07-24 02:19:08 -0700
commitef396df99251b848596c717b63ff4fe74a941193 (patch)
treeab43b61e0a3706a66f8483cc79c5df3513d41ca0 /drivers
parent43b1bb4a9b3e183af12225f56c27164c10d06223 (diff)
downloadlinux-ef396df99251b848596c717b63ff4fe74a941193.tar.bz2
clk: at91: clk-utmi: add utmi support for sama7g5
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> Link: https://lore.kernel.org/r/1595403506-8209-18-git-send-email-claudiu.beznea@microchip.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/clk/at91/clk-utmi.c103
-rw-r--r--drivers/clk/at91/pmc.h4
2 files changed, 102 insertions, 5 deletions
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
index f1ef4e1f41a9..df9f3fc3b6a6 100644
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -120,9 +120,11 @@ static const struct clk_ops utmi_ops = {
.recalc_rate = clk_utmi_recalc_rate,
};
-struct clk_hw * __init
-at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
- const char *name, const char *parent_name)
+static struct clk_hw * __init
+at91_clk_register_utmi_internal(struct regmap *regmap_pmc,
+ struct regmap *regmap_sfr,
+ const char *name, const char *parent_name,
+ const struct clk_ops *ops, unsigned long flags)
{
struct clk_utmi *utmi;
struct clk_hw *hw;
@@ -134,10 +136,10 @@ at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
return ERR_PTR(-ENOMEM);
init.name = name;
- init.ops = &utmi_ops;
+ init.ops = ops;
init.parent_names = parent_name ? &parent_name : NULL;
init.num_parents = parent_name ? 1 : 0;
- init.flags = CLK_SET_RATE_GATE;
+ init.flags = flags;
utmi->hw.init = &init;
utmi->regmap_pmc = regmap_pmc;
@@ -152,3 +154,94 @@ at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
return hw;
}
+
+struct clk_hw * __init
+at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
+ const char *name, const char *parent_name)
+{
+ return at91_clk_register_utmi_internal(regmap_pmc, regmap_sfr, name,
+ parent_name, &utmi_ops, CLK_SET_RATE_GATE);
+}
+
+static int clk_utmi_sama7g5_prepare(struct clk_hw *hw)
+{
+ struct clk_utmi *utmi = to_clk_utmi(hw);
+ struct clk_hw *hw_parent;
+ unsigned long parent_rate;
+ unsigned int val;
+
+ hw_parent = clk_hw_get_parent(hw);
+ parent_rate = clk_hw_get_rate(hw_parent);
+
+ switch (parent_rate) {
+ case 16000000:
+ val = 0;
+ break;
+ case 20000000:
+ val = 2;
+ break;
+ case 24000000:
+ val = 3;
+ break;
+ case 32000000:
+ val = 5;
+ break;
+ default:
+ pr_err("UTMICK: unsupported main_xtal rate\n");
+ return -EINVAL;
+ }
+
+ regmap_write(utmi->regmap_pmc, AT91_PMC_XTALF, val);
+
+ return 0;
+
+}
+
+static int clk_utmi_sama7g5_is_prepared(struct clk_hw *hw)
+{
+ struct clk_utmi *utmi = to_clk_utmi(hw);
+ struct clk_hw *hw_parent;
+ unsigned long parent_rate;
+ unsigned int val;
+
+ hw_parent = clk_hw_get_parent(hw);
+ parent_rate = clk_hw_get_rate(hw_parent);
+
+ regmap_read(utmi->regmap_pmc, AT91_PMC_XTALF, &val);
+ switch (val & 0x7) {
+ case 0:
+ if (parent_rate == 16000000)
+ return 1;
+ break;
+ case 2:
+ if (parent_rate == 20000000)
+ return 1;
+ break;
+ case 3:
+ if (parent_rate == 24000000)
+ return 1;
+ break;
+ case 5:
+ if (parent_rate == 32000000)
+ return 1;
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static const struct clk_ops sama7g5_utmi_ops = {
+ .prepare = clk_utmi_sama7g5_prepare,
+ .is_prepared = clk_utmi_sama7g5_is_prepared,
+ .recalc_rate = clk_utmi_recalc_rate,
+};
+
+struct clk_hw * __init
+at91_clk_sama7g5_register_utmi(struct regmap *regmap_pmc, const char *name,
+ const char *parent_name)
+{
+ return at91_clk_register_utmi_internal(regmap_pmc, NULL, name,
+ parent_name, &sama7g5_utmi_ops, 0);
+}
diff --git a/drivers/clk/at91/pmc.h b/drivers/clk/at91/pmc.h
index 6340b9be8205..7b86affc6d7c 100644
--- a/drivers/clk/at91/pmc.h
+++ b/drivers/clk/at91/pmc.h
@@ -236,6 +236,10 @@ struct clk_hw * __init
at91_clk_register_utmi(struct regmap *regmap_pmc, struct regmap *regmap_sfr,
const char *name, const char *parent_name);
+struct clk_hw * __init
+at91_clk_sama7g5_register_utmi(struct regmap *regmap, const char *name,
+ const char *parent_name);
+
#ifdef CONFIG_PM
void pmc_register_id(u8 id);
void pmc_register_pck(u8 pck);