clk: at91: add pmc_data struct and helpers

Add a new strut to handle references to all the PMC clocks and implement
allocation/free helpers.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index 1fa27f4ea538..0f8b3add1b04 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -47,6 +47,50 @@ int of_at91_get_clk_range(struct device_node *np, const char *propname,
 }
 EXPORT_SYMBOL_GPL(of_at91_get_clk_range);
 
+void pmc_data_free(struct pmc_data *pmc_data)
+{
+	kfree(pmc_data->chws);
+	kfree(pmc_data->shws);
+	kfree(pmc_data->phws);
+	kfree(pmc_data->ghws);
+}
+
+struct pmc_data *pmc_data_allocate(unsigned int ncore, unsigned int nsystem,
+				   unsigned int nperiph, unsigned int ngck)
+{
+	struct pmc_data *pmc_data = kzalloc(sizeof(*pmc_data), GFP_KERNEL);
+
+	if (!pmc_data)
+		return NULL;
+
+	pmc_data->ncore = ncore;
+	pmc_data->chws = kcalloc(ncore, sizeof(struct clk_hw *), GFP_KERNEL);
+	if (!pmc_data->chws)
+		goto err;
+
+	pmc_data->nsystem = nsystem;
+	pmc_data->shws = kcalloc(nsystem, sizeof(struct clk_hw *), GFP_KERNEL);
+	if (!pmc_data->shws)
+		goto err;
+
+	pmc_data->nperiph = nperiph;
+	pmc_data->phws = kcalloc(nperiph, sizeof(struct clk_hw *), GFP_KERNEL);
+	if (!pmc_data->phws)
+		goto err;
+
+	pmc_data->ngck = ngck;
+	pmc_data->ghws = kcalloc(ngck, sizeof(struct clk_hw *), GFP_KERNEL);
+	if (!pmc_data->ghws)
+		goto err;
+
+	return pmc_data;
+
+err:
+	pmc_data_free(pmc_data);
+
+	return NULL;
+}
+
 #ifdef CONFIG_PM
 static struct regmap *pmcreg;