Philipp Zabel 7f218065c1 clk: imx: clk-imx6ul: allow lcdif_pre_sel to change parent rate ...

Allowing the lcdif_pre_sel to propagate rate changes to its parent PLL
allows more fine grained control over the LCDIF pixel clock rate.

For example, the Innovision AT043TN24 LCD panel described in the
imx6ul-14x14-evk device tree requires a 9 MHz pixel clock.
Before this patch, the lcdif_pre_sel clock rate is fixed, and just
setting the lcdif_pred and lcdif_podf dividers only allows to get as
close as about 8.44 MHz:

    pll3                                  1            1   480000000 0 0
       pll3_bypass                        1            1   480000000 0 0
	  pll3_usb_otg                    1            1   480000000 0 0
	     pll3_pfd1_540m               1            1   540000000 0 0
		lcdif_pre_sel             1            1   540000000 0 0
		   lcdif_pred             1            1    67500000 0 0
		      lcdif_podf           1            1     8437500 0 0
			 lcdif_pix           1            1     8437500 0 0

Once lcdif_pre_sel is allowed to propagate rate requests to its parent,
the actual pixel clock matches the requested value:

    pll3                                  1            1   480000000 0 0
       pll3_bypass                        1            1   480000000 0 0
	  pll3_usb_otg                    1            1   480000000 0 0
	     pll3_pfd1_540m               1            1   288000000 0 0
		lcdif_pre_sel             1            1   288000000 0 0
		   lcdif_pred             1            1    36000000 0 0
		      lcdif_podf           1            1     9000000 0 0
                         lcdif_pix           1            1     9000000 0 0

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

2017-11-02 00:25:48 -07:00

..

clk-busy.c

clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h

2016-01-29 12:59:50 -08:00

clk-cpu.c

…

clk-fixup-div.c

clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h

2016-01-29 12:59:50 -08:00

clk-fixup-mux.c

clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h

2016-01-29 12:59:50 -08:00

clk-gate2.c

clk: imx: clk-gate2: allow custom gate configuration

2016-03-31 17:01:55 +08:00

clk-gate-exclusive.c

clk: move the common clock's to_clk_*(_hw) macros to clk-provider.h

2016-01-29 12:59:50 -08:00

clk-imx1.c

ARM: i.MX: Remove i.MX1 non-DT support

2016-08-09 22:47:26 +08:00

clk-imx6q.c

clk: imx6: refine hdmi_isfr's parent to make HDMI work on i.MX6 SoCs w/o VPU

2017-11-02 00:25:34 -07:00

clk-imx6sl.c

clk: imx: constify clk_div_table

2017-08-30 22:30:27 -07:00

clk-imx6sx.c

clk: imx: constify clk_div_table

2017-08-30 22:30:27 -07:00

clk-imx6ul.c

clk: imx: clk-imx6ul: allow lcdif_pre_sel to change parent rate

2017-11-02 00:25:48 -07:00

clk-imx7d.c

clk: imx: constify clk_div_table

2017-08-30 22:30:27 -07:00

clk-imx21.c

clk: i.MX: Remove clk.h include

2015-07-20 10:52:49 -07:00

clk-imx25.c

clk: imx25: Remove osc clock from driver

2015-11-25 11:49:42 +08:00

clk-imx27.c

clk: imx27: add missing of_node_put

2015-10-21 16:16:34 -07:00

clk-imx31.c

ARM: clk: imx31: properly init clocks for machines with DT

2016-11-01 16:44:46 +08:00

clk-imx35.c

ARM: clk-imx35: annotate clk enum with number values

2016-09-14 11:28:04 -07:00

clk-imx51-imx53.c

clk: imx51: propagate rate across ipu_di*_sel

2017-08-31 11:30:47 -07:00

clk-pfd.c

clk: i.MX: Remove clk.h include

2015-07-20 10:52:49 -07:00

clk-pllv1.c

imx/clk-pllv1: fix wrong do_div() usage

2015-11-30 12:58:35 -08:00

clk-pllv2.c

imx/clk-pllv2: fix wrong do_div() usage

2015-11-30 12:58:38 -08:00

clk-pllv3.c

clk: imx7d: Fix the DDR PLL enable bit

2017-06-06 17:42:41 -07:00

clk-vf610.c

clk: imx: constify clk_div_table

2017-08-30 22:30:27 -07:00

clk.c

clk: imx: add common logic to detect early UART usage

2015-09-25 21:58:41 -07:00

clk.h

clk: imx7d: Fix the powerdown bit location of PLL DDR

2017-06-01 00:25:38 -07:00

Makefile

clk: imx: add imx6ul clk tree support

2015-07-14 15:02:13 +08:00