Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1389345

Re: [PATCH 1/3] DRA7: Fix clock data for gmac_gmii_ref_clk_div

Show all headers | View raw

* Tero Kristo <t-kristo@ti.com> [160427 04:22]:
> On 26/04/16 20:54, J.D. Schroeder wrote:
> >From: "J.D. Schroeder" <jay.schroeder@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.schroeder@garmin.com>
> >Reviewed-by: Trenton Andres <trenton.andres@garmin.com>
> 
> Looks like something weird happened with the clock data conversion tool with
> this specific clock. Seems to be the only buggy instance in our clock data
> across SoCs. Good catch.
> 
> Acked-by: Tero Kristo <t-kristo@ti.com>

Applying into omap-for-v4.6/fixes thanks.

Tony

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: [PATCH 1/3] DRA7: Fix clock data for gmac_gmii_ref_clk_div Tero Kristo <t-kristo@ti.com> - 2016-04-27 13:30 +0200
  Re: [PATCH 1/3] DRA7: Fix clock data for gmac_gmii_ref_clk_div Tony Lindgren <tony@atomide.com> - 2016-04-27 18:40 +0200
    Re: [PATCH 1/3] DRA7: Fix clock data for gmac_gmii_ref_clk_div Tony Lindgren <tony@atomide.com> - 2016-04-27 19:20 +0200

csiph-web