Merge tag 'v4.10-rockchip-clk2' of git://git.kernel.org/pub/scm/linux…

…/kernel/git/mmind/linux-rockchip into clk-next

Pull rockchip clk driver updates from Heiko Stuebner:

A new clock controller for the rk1108 soc (single-core Cortex-A7+DSP),
a fix making sure the cpuclk rate is actually valid, before trying to
set it and a copy-paste fix for the rk3399's testclk.

* tag 'v4.10-rockchip-clk2' of git://git.kernel.org/pub/scm/linux/kernel/git/mmind/linux-rockchip:
  clk: rockchip: add clock controller for rk1108
  dt-bindings: add documentation for rk1108 cru
  clk: rockchip: add dt-binding header for rk1108
  clk: rockchip: fix copy-paste error in rk3399 testclk
  clk: rockchip: validity should be checked prior to cpu clock rate change

Documentation/devicetree/bindings/clock/rockchip,rk1108-cru.txt

@@ -0,0 +1,59 @@
+* Rockchip RK1108 Clock and Reset Unit
+
+The RK1108 clock controller generates and supplies clock to various
+controllers within the SoC and also implements a reset controller for SoC
+peripherals.
+
+Required Properties:
+
+- compatible: should be "rockchip,rk1108-cru"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- #clock-cells: should be 1.
+- #reset-cells: should be 1.
+
+Optional Properties:
+
+- rockchip,grf: phandle to the syscon managing the "general register files"
+  If missing pll rates are not changeable, due to the missing pll lock status.
+
+Each clock is assigned an identifier and client nodes can use this identifier
+to specify the clock which they consume. All available clocks are defined as
+preprocessor macros in the dt-bindings/clock/rk1108-cru.h headers and can be
+used in device tree sources. Similar macros exist for the reset sources in
+these files.
+
+External clocks:
+
+There are several clocks that are generated outside the SoC. It is expected
+that they are defined using standard clock bindings with following
+clock-output-names:
+ - "xin24m" - crystal input - required,
+ - "ext_vip" - external VIP clock - optional
+ - "ext_i2s" - external I2S clock - optional
+ - "ext_gmac" - external GMAC clock - optional
+ - "hdmiphy" - external clock input derived from HDMI PHY - optional
+ - "usbphy" - external clock input derived from USB PHY - optional
+
+Example: Clock controller node:
+
+	cru: cru@20200000 {
+		compatible = "rockchip,rk1108-cru";
+		reg = <0x20200000 0x1000>;
+		rockchip,grf = <&grf>;
+
+		#clock-cells = <1>;
+		#reset-cells = <1>;
+	};
+
+Example: UART controller node that consumes the clock generated by the clock
+  controller:
+
+	uart0: serial@10230000 {
+		compatible = "rockchip,rk1108-uart", "snps,dw-apb-uart";
+		reg = <0x10230000 0x100>;
+		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+		clocks = <&cru SCLK_UART0>;
+	};

drivers/clk/rockchip/Makefile

@@ -11,6 +11,7 @@ obj-y	+= clk-mmc-phase.o
 obj-y	+= clk-ddr.o
 obj-$(CONFIG_RESET_CONTROLLER)	+= softrst.o
 
+obj-y	+= clk-rk1108.o
 obj-y	+= clk-rk3036.o
 obj-y	+= clk-rk3188.o
 obj-y	+= clk-rk3228.o

drivers/clk/rockchip/clk-cpu.c

@@ -124,9 +124,18 @@ static int rockchip_cpuclk_pre_rate_change(struct rockchip_cpuclk *cpuclk,
 					   struct clk_notifier_data *ndata)
 {
 	const struct rockchip_cpuclk_reg_data *reg_data = cpuclk->reg_data;
+	const struct rockchip_cpuclk_rate_table *rate;
 	unsigned long alt_prate, alt_div;
 	unsigned long flags;
 
+	/* check validity of the new rate */
+	rate = rockchip_get_cpuclk_settings(cpuclk, ndata->new_rate);
+	if (!rate) {
+		pr_err("%s: Invalid rate : %lu for cpuclk\n",
+		       __func__, ndata->new_rate);
+		return -EINVAL;
+	}
+
 	alt_prate = clk_get_rate(cpuclk->alt_parent);
 
 	spin_lock_irqsave(cpuclk->lock, flags);