Hi Rajendra/Paul/Mike, I am debugging the issue reported by Michal on AM33xx clock tree In the context of LCDC driver functionality- http://www.mail-archive.com/dri-devel@xxxxxxxxxxxxxxxxxxxxx/msg36102.html Where, the clk_set_rate() seems to be not working, and that's true with the current implementation of OMAP/AM33xx clock tree, as the CLK_SET_RATE_PARENT flag is not set to any of the clock nodes. Please note that I am using DEFINE_STRUCT_CLK() macro for defining clocks And which doesn't allow you to specify the flags. Below is the propagation scenario under discussion: DISP_DPLL (dpll_disp_ck) ->> dpll_disp_m2_ck ->> lcd_clk_mux_sel ->> lcd_gclk Just to make sure that propagation works fine, I hacked the code and tested it on AM335x BeagleBone platform without any issues. Can I create a patch modifying DEFINE_STRUCT_CLK() macro to take Another argument '.flags" and change all clock-trees accrordingly?? Diff Starts here: ===================== diff --git a/arch/arm/mach-omap2/board-generic.c b/arch/arm/mach-omap2/board-generic.c index 7baede1..51fc78b 100644 --- a/arch/arm/mach-omap2/board-generic.c +++ b/arch/arm/mach-omap2/board-generic.c @@ -11,6 +11,7 @@ * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ +#include <linux/clk-private.h> #include <linux/io.h> #include <linux/of_irq.h> #include <linux/of_platform.h> @@ -100,6 +101,7 @@ exit: static void __init omap_generic_init(void) { struct device_node *np; + struct clk *clk; omap_sdrc_init(NULL, NULL); @@ -115,6 +117,15 @@ static void __init omap_generic_init(void) if (of_machine_is_compatible("ti,omap5")) omap_sata_init(); + + clk = clk_get(NULL, "lcd_gclk"); + if (IS_ERR(clk)) + printk("Can not get lcd_gclk clock\n"); + + printk("%s:%d gclk_rate - %lu\n", __func__, __LINE__, clk_get_rate(clk)); + clk_set_rate(clk, 300000000); + printk("%s:%d clk_rate - %lu\n", __func__, __LINE__, clk_get_rate(clk)); + clk_put(clk); } #ifdef CONFIG_SOC_OMAP2420 diff --git a/arch/arm/mach-omap2/cclock33xx_data.c b/arch/arm/mach-omap2/cclock33xx_data.c index e674e01..d4552db 100644 --- a/arch/arm/mach-omap2/cclock33xx_data.c +++ b/arch/arm/mach-omap2/cclock33xx_data.c @@ -284,7 +284,7 @@ DEFINE_STRUCT_CLK(dpll_disp_ck, dpll_core_ck_parents, dpll_ddr_ck_ops); * TODO: Add clksel here (sys_clkin, CORE_CLKOUTM6, PER_CLKOUTM2 * and ALT_CLK1/2) */ -DEFINE_CLK_DIVIDER(dpll_disp_m2_ck, "dpll_disp_ck", &dpll_disp_ck, 0x0, +DEFINE_CLK_DIVIDER(dpll_disp_m2_ck, "dpll_disp_ck", &dpll_disp_ck, CLK_SET_RATE_PARENT, AM33XX_CM_DIV_M2_DPLL_DISP, AM33XX_DPLL_CLKOUT_DIV_SHIFT, AM33XX_DPLL_CLKOUT_DIV_WIDTH, CLK_DIVIDER_ONE_BASED, NULL); diff --git a/arch/arm/mach-omap2/clock.h b/arch/arm/mach-omap2/clock.h index 836311f..3830e5b 100644 --- a/arch/arm/mach-omap2/clock.h +++ b/arch/arm/mach-omap2/clock.h @@ -64,6 +64,7 @@ struct clockdomain; .parent_names = _parent_array_name, \ .num_parents = ARRAY_SIZE(_parent_array_name), \ .ops = &_clkops_name, \ + .flags = CLK_SET_RATE_PARENT, \ }; #define DEFINE_STRUCT_CLK_HW_OMAP(_name, _clkdm_name) \ Thanks, Vaibhav -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
