ARM: dts: dra7: Fix clock data for gmac_gmii_ref_clk_div

This commit fixes the clock data inside the DRA7xx clocks device tree
structure for the gmac_gmii_ref_clk_div clock. This clock is actually
the GMAC_MAIN_CLK and has nothing to do with the register at address
0x4a0093d0. If CLKSEL_REF bit 24 inside of CM_GMAC_GMAC_CLKCTRL, is
set to 1 in order to use the GMAC_RMII_CLK instead of the
GMAC_RMII_HS_CLK, the kernel generates a clock divider warning:
    WARNING: CPU: 0 PID: 0 at drivers/clk/clk-divider.c:129 clk_divider_recalc_rate+0xa8/0xe0()
    gmac_gmii_ref_clk_div: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set

By properly configuring the gmac_gmii_ref_clk_div (GMAC_MAIN_CLK) to
have the parent of dpll_gmac_m2_ck always divided by 2 the warning is
resolved and the clock tree is fixed up.

Additionally, a new clock called rmii_50mhz_clk_mux is defined that
does utilize CM_GMAC_GMAC_CLKCTRL[24] CLKSEL_REF to configure the
source clock for the RMII_50MHZ_CLK.

Cc: Lokesh Vutla <lokeshvutla@ti.com>
Signed-off-by: J.D. Schroeder <jay.schroeder@garmin.com>
Reviewed-by: Trenton Andres <trenton.andres@garmin.com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi b/arch/arm/boot/dts/dra7xx-clocks.dtsi
index 8378b44..3f0c61d 100644 (file)
--- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
+++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
@@ -1718,13 +1718,20 @@
                reg = <0x0c00>;
        };
 
-       gmac_gmii_ref_clk_div: gmac_gmii_ref_clk_div@13d0 {
+       rmii_50mhz_clk_mux: rmii_50mhz_clk_mux@13d0 {
                #clock-cells = <0>;
-               compatible = "ti,divider-clock";
-               clocks = <&dpll_gmac_m2_ck>;
+               compatible = "ti,mux-clock";
+               clocks = <&dpll_gmac_h11x2_ck>, <&rmii_clk_ck>;
                ti,bit-shift = <24>;
                reg = <0x13d0>;
-               ti,dividers = <2>;
+       };
+
+       gmac_gmii_ref_clk_div: gmac_gmii_ref_clk_div {
+               #clock-cells = <0>;
+               compatible = "fixed-factor-clock";
+               clocks = <&dpll_gmac_m2_ck>;
+               clock-mult = <1>;
+               clock-div = <2>;
        };
 
        gmac_rft_clk_mux: gmac_rft_clk_mux@13d0 {