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clk: lan966x: Extend lan966x clock driver for clock gating support

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Extend the clock driver to add support also for clock gating. The
following peripherals can be gated: UHPHS, UDPHS, MCRAMC, HMATRIX.

Signed-off-by: Horatiu Vultur <horatiu.vultur@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20211103085102.1656081-5-horatiu.vultur@microchip.com
This commit is contained in:
Horatiu Vultur 2021-11-03 09:51:02 +01:00 committed by Nicolas Ferre
parent 51d0a37dde
commit 5ad5915dea
1 changed files with 56 additions and 3 deletions
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59
drivers/clk/clk-lan966x.c
View file

@ -48,6 +48,20 @@ static struct clk_init_data init = {
.num_parents = ARRAY_SIZE(lan966x_gck_pdata),
};
struct clk_gate_soc_desc {
const char *name;
int bit_idx;
};
static const struct clk_gate_soc_desc clk_gate_desc[] = {
{ "uhphs", 11 },
{ "udphs", 10 },
{ "mcramc", 9 },
{ "hmatrix", 8 },
{ }
};
static DEFINE_SPINLOCK(clk_gate_lock);
static void __iomem *base;
static int lan966x_gck_enable(struct clk_hw *hw)
@ -188,11 +202,37 @@ static struct clk_hw *lan966x_gck_clk_register(struct device *dev, int i)
return &priv->hw;
};
static int lan966x_gate_clk_register(struct device *dev,
struct clk_hw_onecell_data *hw_data,
void __iomem *gate_base)
{
int i;
for (i = GCK_GATE_UHPHS; i < N_CLOCKS; ++i) {
int idx = i - GCK_GATE_UHPHS;
hw_data->hws[i] =
devm_clk_hw_register_gate(dev, clk_gate_desc[idx].name,
"lan966x", 0, base,
clk_gate_desc[idx].bit_idx,
0, &clk_gate_lock);
if (IS_ERR(hw_data->hws[i]))
return dev_err_probe(dev, PTR_ERR(hw_data->hws[i]),
"failed to register %s clock\n",
clk_gate_desc[idx].name);
}
return 0;
}
static int lan966x_clk_probe(struct platform_device *pdev)
{
struct clk_hw_onecell_data *hw_data;
struct device *dev = &pdev->dev;
int i;
void __iomem *gate_base;
struct resource *res;
int i, ret;
hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, N_CLOCKS),
GFP_KERNEL);
@ -205,9 +245,9 @@ static int lan966x_clk_probe(struct platform_device *pdev)
init.ops = &lan966x_gck_ops;
hw_data->num = N_CLOCKS;
hw_data->num = GCK_GATE_UHPHS;
for (i = 0; i < N_CLOCKS; i++) {
for (i = 0; i < GCK_GATE_UHPHS; i++) {
init.name = clk_names[i];
hw_data->hws[i] = lan966x_gck_clk_register(dev, i);
if (IS_ERR(hw_data->hws[i])) {
@ -217,6 +257,19 @@ static int lan966x_clk_probe(struct platform_device *pdev)
}
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (res) {
gate_base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(gate_base))
return PTR_ERR(gate_base);
hw_data->num = N_CLOCKS;
ret = lan966x_gate_clk_register(dev, hw_data, gate_base);
if (ret)
return ret;
}
return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data);
}