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Date: Sun, 18 Nov 2018 10:32:51 +0100
From: Neil Armstrong <narmstrong@...libre.com>
To: khilman@...libre.com
CC: linux-amlogic@...ts.infradead.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/3] Add Amlogic Meson GX SoC Clock Measure Driver
Le 14/11/2018 14:17, Neil Armstrong a écrit :
> On 14/11/2018 14:16, Neil Armstrong wrote:
>> The Amlogic Meson GX SoCs embeds a clock measurer IP to measure the internal
>> clocks frequencyies.
>> The precision is determined by stepping into the divider until the counter
>> overflows.
>> The debugfs slows a pretty summary and each clock can be measured
>> individually aswell.
>>
>> Thsi patchset includes the dt-bindings, driver and the DT node added to the
>> meson-gx dtsi.
I'll respin a v3 with the comments from Martin and Meson8 & Meson8b support !
Neil
>>
>> Changes since v1 at [1]:
>> - fixed clock names
>> - added summary in debugfs and moved indivudual clocks into a subdirectory
>> - added the GX table to the match data
>>
>> Neil Armstrong (3):
>> dt-bindings: amlogic: Add Internal Clock Measurer bindings
>> soc: amlogic: Add Meson GX Clock Measure driver
>> ARM64: dts: meson-gx: Add Internal Clock Measurer node
>>
>> .../bindings/soc/amlogic/clk-measure.txt | 15 +
>> arch/arm64/boot/dts/amlogic/meson-gx.dtsi | 5 +
>> drivers/soc/amlogic/Kconfig | 8 +
>> drivers/soc/amlogic/Makefile | 1 +
>> drivers/soc/amlogic/meson-gx-clk-measure.c | 293 ++++++++++++++++++
>> 5 files changed, 322 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/soc/amlogic/clk-measure.txt
>> create mode 100644 drivers/soc/amlogic/meson-gx-clk-measure.c
>>
>
> For example, the debugfs summary looks like :
>
> # cat /sys/kernel/debug/meson-clk-msr/measure_summary
> clock rate precision
> ---------------------------------------------
> ring_osc_out_ee_0 0 +/-3125Hz
> ring_osc_out_ee_1 0 +/-3125Hz
> ring_osc_out_ee_2 0 +/-3125Hz
> a53_ring_osc 0 +/-3125Hz
> gp0_pll 0 +/-3125Hz
> enci 26998438 +/-3125Hz
> clk81 166661458 +/-5208Hz
> encp 0 +/-3125Hz
> encl 0 +/-3125Hz
> vdac 26998438 +/-3125Hz
> rgmii_tx 0 +/-3125Hz
> pdm 0 +/-3125Hz
> amclk 0 +/-3125Hz
> fec_0 0 +/-3125Hz
> fec_1 0 +/-3125Hz
> fec_2 0 +/-3125Hz
> sys_pll_div16 0 +/-3125Hz
> sys_cpu_div16 0 +/-3125Hz
> hdmitx_sys 24000000 +/-3125Hz
> rtc_osc_out 32813 +/-3125Hz
> i2s_in_src0 0 +/-3125Hz
> eth_phy_ref 0 +/-3125Hz
> hdmi_todig 0 +/-3125Hz
> sc_int 0 +/-3125Hz
> sar_adc 1195313 +/-3125Hz
> mpll_test_out 0 +/-3125Hz
> vdec 0 +/-3125Hz
> mali 0 +/-3125Hz
> hdmi_tx_pixel 0 +/-3125Hz
> i958 0 +/-3125Hz
> vdin_meas 1484656250 +/-62500Hz
> pcm_sclk 0 +/-3125Hz
> pcm_mclk 0 +/-3125Hz
> eth_rx_or_rmii 50000000 +/-3125Hz
> mp0_out 0 +/-3125Hz
> fclk_div5 0 +/-3125Hz
> pwm_b 24000000 +/-3125Hz
> pwm_a 0 +/-3125Hz
> vpu 666625000 +/-20833Hz
> ddr_dpll_pt 0 +/-3125Hz
> mp1_out 0 +/-3125Hz
> mp2_out 0 +/-3125Hz
> mp3_out 0 +/-3125Hz
> nand_core 24000000 +/-3125Hz
> sd_emmc_b 0 +/-3125Hz
> sd_emmc_a 0 +/-3125Hz
> vid_pll_div_out 1484843750 +/-62500Hz
> cci 0 +/-3125Hz
> wave420l_c 0 +/-3125Hz
> wave420l_b 0 +/-3125Hz
> hcodec 0 +/-3125Hz
> alt_32k 0 +/-3125Hz
> gpio_msr 0 +/-3125Hz
> hevc 0 +/-3125Hz
> vid_lock 0 +/-3125Hz
> pwm_f 0 +/-3125Hz
> pwm_e 0 +/-3125Hz
> pwm_d 23984375 +/-3125Hz
> pwm_c 0 +/-3125Hz
> aoclkx2_int 0 +/-3125Hz
> aoclk_int 0 +/-3125Hz
> rng_ring_osc_0 66746875 +/-3125Hz
> rng_ring_osc_1 58442188 +/-3125Hz
> rng_ring_osc_2 52098438 +/-3125Hz
> rng_ring_osc_3 46662500 +/-3125Hz
> vapb 249996094 +/-7812Hz
> ge2d 249992188 +/-7812Hz
>
> On the AML-S905X-CC board.
>
> Neil
>
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