From: "J.D. Schroeder" <jay.schroe...@garmin.com> 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. Signed-off-by: J.D. Schroeder <jay.schroe...@garmin.com> Reviewed-by: Trenton Andres <trenton.and...@garmin.com> --- arch/arm/boot/dts/dra7xx-clocks.dtsi | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi b/arch/arm/boot/dts/dra7xx-clocks.dtsi index d0bae06..9d1a583 100644 --- a/arch/arm/boot/dts/dra7xx-clocks.dtsi +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi @@ -1710,13 +1710,20 @@ reg = <0x0c00>; }; - gmac_gmii_ref_clk_div: gmac_gmii_ref_clk_div { + rmii_50mhz_clk_mux: rmii_50mhz_clk_mux { #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 { -- 1.9.1