From: Stephen Boyd Date: Mon, 5 Nov 2018 19:40:11 +0000 (-0800) Subject: clk: qcom: Support 'protected-clocks' property X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b181b3b801da8893c8eb706e448dd5111b02de60;p=linux.git clk: qcom: Support 'protected-clocks' property Certain firmware configurations "protect" clks and cause the entire system to reboot when a non-secure OS such as Linux tries to read or write protected clk registers. But other firmware configurations allow reading or writing the same registers, and they may actually require that the OS use the otherwise locked down clks. Support the 'protected-clocks' property by never registering these protected clks with the common clk framework. This way, when firmware is protecting these clks we won't have the chance to ever read or write these registers and take down the entire system. Cc: Taniya Das Cc: Bjorn Andersson Signed-off-by: Stephen Boyd Reviewed-by: Bjorn Andersson Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c index db9b2471ac401..0a48ed56833b4 100644 --- a/drivers/clk/qcom/common.c +++ b/drivers/clk/qcom/common.c @@ -191,6 +191,22 @@ int qcom_cc_register_sleep_clk(struct device *dev) } EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); +/* Drop 'protected-clocks' from the list of clocks to register */ +static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc) +{ + struct device_node *np = dev->of_node; + struct property *prop; + const __be32 *p; + u32 i; + + of_property_for_each_u32(np, "protected-clocks", prop, p, i) { + if (i >= cc->num_rclks) + continue; + + cc->rclks[i] = NULL; + } +} + static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec, void *data) { @@ -251,6 +267,8 @@ int qcom_cc_really_probe(struct platform_device *pdev, cc->rclks = rclks; cc->num_rclks = num_clks; + qcom_cc_drop_protected(dev, cc); + for (i = 0; i < num_clks; i++) { if (!rclks[i]) continue;