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Wed, 14 Nov 2018 05:17:14 -0800 (PST) Subject: Re: [PATCH v2 0/3] Add Amlogic Meson GX SoC Clock Measure Driver To: khilman@baylibre.com Cc: linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: <20181114131627.17766-1-narmstrong@baylibre.com> From: Neil Armstrong Openpgp: preference=signencrypt Autocrypt: addr=narmstrong@baylibre.com; prefer-encrypt=mutual; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKE5laWwgQXJtc3Ryb25nIDxuYXJtc3Ryb25nQGJheWxpYnJlLmNvbT7CwHsEEwEKACUC GyMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheABQJXDO2CAhkBAAoJEBaat7Gkz/iubGIH/iyk RqvgB62oKOFlgOTYCMkYpm2aAOZZLf6VKHKc7DoVwuUkjHfIRXdslbrxi4pk5VKU6ZP9AKsN NtMZntB8WrBTtkAZfZbTF7850uwd3eU5cN/7N1Q6g0JQihE7w4GlIkEpQ8vwSg5W7hkx3yQ6 2YzrUZh/b7QThXbNZ7xOeSEms014QXazx8+txR7jrGF3dYxBsCkotO/8DNtZ1R+aUvRfpKg5 ZgABTC0LmAQnuUUf2PHcKFAHZo5KrdO+tyfL+LgTUXIXkK+tenkLsAJ0cagz1EZ5gntuheLD YJuzS4zN+1Asmb9kVKxhjSQOcIh6g2tw7vaYJgL/OzJtZi6JlIXOwE0ETVkGzwEIALyKDN/O GURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYpQTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXM coJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hi SvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY4yG6xI99NIPEVE9lNBXBKIlewIyVlkOa YvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoMMtsyw18YoX9BqMFInxqYQQ3j/HpVgTSv mo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUXoUk33HEAEQEAAcLAXwQYAQIACQUCTVkG zwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfnM7IbRuiSZS1unlySUVYu3SD6YBYnNi3G 5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa33eDIHu/zr1HMKErm+2SD6PO9umRef8V8 2o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCSKmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+ RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJ C3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTTQbM0WUIBIcGmq38+OgUsMYu4NzLu7uZF Acmp6h8g Organization: Baylibre Message-ID: <75ca31ca-82f4-c9e9-0d73-29fde405c47c@baylibre.com> Date: Wed, 14 Nov 2018 14:17:14 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <20181114131627.17766-1-narmstrong@baylibre.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. > > 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