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clk: qcom: Add properties for marking clocks as critical

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Some clocks are critical only on specific boards, i.e. clocks used to
interface with external PMICs over I2C. Which clocks are critical depend
on which I2C bus is chosen to connect the PMICs. To support this, add
properties to set QCOM_CLK_IS_CRITICAL on a per-board basis.

The qcom,critical-clocks property can be used to set
QCOM_CLK_IS_CRITICAL on individual clocks.

The qcom,critical-devices property can be used to set
QCOM_CLK_IS_CRITICAL on all clocks used by specified devices.

Change-Id: I42d61ec13225026ba7d0b78079cf7a2ab67339f2
Signed-off-by: Mike Tipton <mdtipton@codeaurora.org>
This commit is contained in:
Mike Tipton 2020-11-04 17:47:24 -08:00 • committed by Gerrit - the friendly Code Review server
commit 0022172cdd
1 changed files with 42 additions and 0 deletions
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42
drivers/clk/qcom/common.c
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@ -232,6 +232,47 @@ static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc)
}
}
/* Set QCOM_CLK_IS_CRITICAL on clocks specified in dt */
static void qcom_cc_set_critical(struct device *dev, struct qcom_cc *cc)
{
struct of_phandle_args args;
struct device_node *np;
struct property *prop;
const __be32 *p;
u32 clock_idx;
u32 i;
int cnt;
of_property_for_each_u32(dev->of_node, "qcom,critical-clocks", prop, p, i) {
if (i >= cc->num_rclks)
continue;
cc->rclks[i]->flags |= QCOM_CLK_IS_CRITICAL;
}
of_property_for_each_u32(dev->of_node, "qcom,critical-devices", prop, p, i) {
np = of_find_node_by_phandle(i);
if (!np)
continue;
cnt = of_count_phandle_with_args(np, "clocks", "#clock-cells");
for (i = 0; i < cnt; i++) {
of_parse_phandle_with_args(np, "clocks", "#clock-cells",
i, &args);
clock_idx = args.args[0];
if (args.np != dev->of_node || clock_idx >= cc->num_rclks)
continue;
cc->rclks[clock_idx]->flags |= QCOM_CLK_IS_CRITICAL;
of_node_put(args.np);
}
of_node_put(np);
}
}
static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
void *data)
{
@ -310,6 +351,7 @@ int qcom_cc_really_probe(struct platform_device *pdev,
cc->num_clk_hws = num_clk_hws;
qcom_cc_drop_protected(dev, cc);
qcom_cc_set_critical(dev, cc);
for (i = 0; i < num_clk_hws; i++) {
if (!clk_hws[i])