| Message ID | 1364224652-28332-3-git-send-email-shawn.guo@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hello Shawn, On Mon, Mar 25, 2013 at 11:17:28PM +0800, Shawn Guo wrote: > Change call clk_get_sys() to of_clk_get() to look up timrot clock from > device tree, so that the clk_register_clkdev() call for timrot can be > saved in clock driver. I'm currently using an i.MX28 with 3.8-rt13 and patched the clocksource and clockevent to use the 24 MHz clock source (BV_TIMROTv2_TIMCTRLn_SELECT__ALWAYS instead of BV_TIMROTv2_TIMCTRLn_SELECT__32KHZ_XTAL). Currently my patch is a hack because I hard code the 24 MHz. I wonder how to do it properly? Add another item to the "clocks = <...>" entry and use the first entry for enable and the 2nd for clk_get_rate? Something like: always_clk = of_clk_get(np, 1); if (always_clk) register timers using always clk (24 MHz, SELECT__ALWAYS) else fall back to timer_clk (32 kHz, 32KHZ_XTAL) and then timrot@80068000 { compatible = "fsl,imx28-timrot", "fsl,timrot"; reg = <0x80068000 0x2000>; interrupts = <48 49 50 51>; clocks = <&clks 26 &clks 0>; }; If you like it, too, I can prepare a patch. Best regards Uwe
Hi Uwe, On Thu, Jul 11, 2013 at 12:56:26PM +0200, Uwe Kleine-König wrote: > I'm currently using an i.MX28 with 3.8-rt13 and patched the clocksource > and clockevent to use the 24 MHz clock source > (BV_TIMROTv2_TIMCTRLn_SELECT__ALWAYS instead of > BV_TIMROTv2_TIMCTRLn_SELECT__32KHZ_XTAL). Currently my patch is a hack > because I hard code the 24 MHz. I wonder how to do it properly? > You may want to take a look at commit 2fb318f (ARM: mxs: use apbx bus clock to drive the timers on timrotv2), which hit mainline in v3.9. Shawn > Add another item to the "clocks = <...>" entry and use the first entry > for enable and the 2nd for clk_get_rate? > > Something like: > > always_clk = of_clk_get(np, 1); > if (always_clk) > register timers using always clk (24 MHz, SELECT__ALWAYS) > else > fall back to timer_clk (32 kHz, 32KHZ_XTAL) > > and then > > timrot@80068000 { > compatible = "fsl,imx28-timrot", "fsl,timrot"; > reg = <0x80068000 0x2000>; > interrupts = <48 49 50 51>; > clocks = <&clks 26 &clks 0>; > }; > > If you like it, too, I can prepare a patch. > > Best regards > Uwe > > -- > Pengutronix e.K. | Uwe Kleine-König | > Industrial Linux Solutions | http://www.pengutronix.de/ |
diff --git a/arch/arm/boot/dts/imx23.dtsi b/arch/arm/boot/dts/imx23.dtsi index 56afcf4..27ce807 100644 --- a/arch/arm/boot/dts/imx23.dtsi +++ b/arch/arm/boot/dts/imx23.dtsi @@ -426,6 +426,7 @@ compatible = "fsl,imx23-timrot", "fsl,timrot"; reg = <0x80068000 0x2000>; interrupts = <28 29 30 31>; + clocks = <&clks 28>; }; auart0: serial@8006c000 { diff --git a/arch/arm/boot/dts/imx28.dtsi b/arch/arm/boot/dts/imx28.dtsi index 7ba4966..c2f10d3 100644 --- a/arch/arm/boot/dts/imx28.dtsi +++ b/arch/arm/boot/dts/imx28.dtsi @@ -838,6 +838,7 @@ compatible = "fsl,imx28-timrot", "fsl,timrot"; reg = <0x80068000 0x2000>; interrupts = <48 49 50 51>; + clocks = <&clks 26>; }; auart0: serial@8006a000 { diff --git a/arch/arm/mach-mxs/timer.c b/arch/arm/mach-mxs/timer.c index fe2903d..f5142aa 100644 --- a/arch/arm/mach-mxs/timer.c +++ b/arch/arm/mach-mxs/timer.c @@ -247,7 +247,7 @@ static void __init mxs_timer_init(struct device_node *np) struct clk *timer_clk; int irq; - timer_clk = clk_get_sys("timrot", NULL); + timer_clk = of_clk_get(np, 0); if (IS_ERR(timer_clk)) { pr_err("%s: failed to get clk\n", __func__); return; diff --git a/drivers/clk/mxs/clk-imx23.c b/drivers/clk/mxs/clk-imx23.c index 52e0365..f65b19c 100644 --- a/drivers/clk/mxs/clk-imx23.c +++ b/drivers/clk/mxs/clk-imx23.c @@ -160,8 +160,6 @@ int __init mx23_clocks_init(void) of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); } - clk_register_clkdev(clks[clk32k], NULL, "timrot"); - for (i = 0; i < ARRAY_SIZE(clks_init_on); i++) clk_prepare_enable(clks[clks_init_on[i]]); diff --git a/drivers/clk/mxs/clk-imx28.c b/drivers/clk/mxs/clk-imx28.c index 03918e1..3cc82ea 100644 --- a/drivers/clk/mxs/clk-imx28.c +++ b/drivers/clk/mxs/clk-imx28.c @@ -238,7 +238,6 @@ int __init mx28_clocks_init(void) of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); } - clk_register_clkdev(clks[xbus], NULL, "timrot"); clk_register_clkdev(clks[enet_out], NULL, "enet_out"); for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
Change call clk_get_sys() to of_clk_get() to look up timrot clock from device tree, so that the clk_register_clkdev() call for timrot can be saved in clock driver. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> --- arch/arm/boot/dts/imx23.dtsi | 1 + arch/arm/boot/dts/imx28.dtsi | 1 + arch/arm/mach-mxs/timer.c | 2 +- drivers/clk/mxs/clk-imx23.c | 2 -- drivers/clk/mxs/clk-imx28.c | 1 - 5 files changed, 3 insertions(+), 4 deletions(-)