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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id e3-20020a056a0000c300b006da14f68ac1sm8348585pfj.198.2024.01.15.20.11.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jan 2024 20:11:10 -0800 (PST) From: Nylon Chen To: paul.walmsley@sifive.com, palmer@dabbelt.com, conor+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, u.kleine-koenig@pengutronix.de, thierry.reding@gmail.com, aou@eecs.berkeley.edu Cc: zong.li@sifve.com, vincent.chen@sifive.com, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, nylon7717@gmail.com, Nylon Chen , Conor Dooley Subject: [v6 1/3] riscv: dts: sifive: unleashed/unmatched: Remove PWM controlled LED's active-low properties Date: Tue, 16 Jan 2024 12:10:52 +0800 Message-ID: <20240116041054.11641-2-nylon.chen@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240116041054.11641-1-nylon.chen@sifive.com> References: <20240116041054.11641-1-nylon.chen@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This removes the active-low properties of the PWM-controlled LEDs in the HiFive Unmatched device tree. The reference is hifive-unleashed-a00.pdf[0] and hifive-unmatched-schematic= s-v3.pdf[1]. Link: https://sifive.cdn.prismic.io/sifive/c52a8e32-05ce-4aaf-95c8-7bf8453f= 8698_hifive-unleashed-a00-schematics-1.pdf [0] Link: https://sifive.cdn.prismic.io/sifive/6a06d6c0-6e66-49b5-8e9e-e68ce76f= 4192_hifive-unmatched-schematics-v3.pdf [1] Acked-by: Conor Dooley Reviewed-by: Conor Dooley Co-developed-by: Zong Li Signed-off-by: Zong Li Co-developed-by: Vincent Chen Signed-off-by: Vincent Chen Signed-off-by: Nylon Chen --- arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts | 8 ++++---- arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts | 12 ++++-------- 2 files changed, 8 insertions(+), 12 deletions(-) diff --git a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts b/arch/ris= cv/boot/dts/sifive/hifive-unleashed-a00.dts index 900a50526d77..11e7ac1c54bb 100644 --- a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts +++ b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts @@ -49,7 +49,7 @@ led-controller { compatible =3D "pwm-leds"; =20 led-d1 { - pwms =3D <&pwm0 0 7812500 PWM_POLARITY_INVERTED>; + pwms =3D <&pwm0 0 7812500 0>; active-low; color =3D ; max-brightness =3D <255>; @@ -57,7 +57,7 @@ led-d1 { }; =20 led-d2 { - pwms =3D <&pwm0 1 7812500 PWM_POLARITY_INVERTED>; + pwms =3D <&pwm0 1 7812500 0>; active-low; color =3D ; max-brightness =3D <255>; @@ -65,7 +65,7 @@ led-d2 { }; =20 led-d3 { - pwms =3D <&pwm0 2 7812500 PWM_POLARITY_INVERTED>; + pwms =3D <&pwm0 2 7812500 0>; active-low; color =3D ; max-brightness =3D <255>; @@ -73,7 +73,7 @@ led-d3 { }; =20 led-d4 { - pwms =3D <&pwm0 3 7812500 PWM_POLARITY_INVERTED>; + pwms =3D <&pwm0 3 7812500 0>; active-low; color =3D ; max-brightness =3D <255>; diff --git a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts b/arch/ris= cv/boot/dts/sifive/hifive-unmatched-a00.dts index 07387f9c135c..b328ee80693f 100644 --- a/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts +++ b/arch/riscv/boot/dts/sifive/hifive-unmatched-a00.dts @@ -51,8 +51,7 @@ led-controller-1 { compatible =3D "pwm-leds"; =20 led-d12 { - pwms =3D <&pwm0 0 7812500 PWM_POLARITY_INVERTED>; - active-low; + pwms =3D <&pwm0 0 7812500 0>; color =3D ; max-brightness =3D <255>; label =3D "d12"; @@ -68,20 +67,17 @@ multi-led { label =3D "d2"; =20 led-red { - pwms =3D <&pwm0 2 7812500 PWM_POLARITY_INVERTED>; - active-low; + pwms =3D <&pwm0 2 7812500 0>; color =3D ; }; =20 led-green { - pwms =3D <&pwm0 1 7812500 PWM_POLARITY_INVERTED>; - active-low; + pwms =3D <&pwm0 1 7812500 0>; color =3D ; }; =20 led-blue { - pwms =3D <&pwm0 3 7812500 PWM_POLARITY_INVERTED>; - active-low; + pwms =3D <&pwm0 3 7812500 0>; color =3D ; }; }; --=20 2.42.0 From nobody Wed Dec 17 09:45:01 2025 Received: from mail-pf1-f170.google.com (mail-pf1-f170.google.com [209.85.210.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6AE206FA8 for ; Tue, 16 Jan 2024 04:11:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=sifive.com Authentication-Results: smtp.subspace.kernel.org; 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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id e3-20020a056a0000c300b006da14f68ac1sm8348585pfj.198.2024.01.15.20.11.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jan 2024 20:11:16 -0800 (PST) From: Nylon Chen To: paul.walmsley@sifive.com, palmer@dabbelt.com, conor+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, u.kleine-koenig@pengutronix.de, thierry.reding@gmail.com, aou@eecs.berkeley.edu Cc: zong.li@sifve.com, vincent.chen@sifive.com, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, nylon7717@gmail.com, Nylon Chen Subject: [v6 2/3] pwm: sifive: change the PWM controlled LED algorithm Date: Tue, 16 Jan 2024 12:10:53 +0800 Message-ID: <20240116041054.11641-3-nylon.chen@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240116041054.11641-1-nylon.chen@sifive.com> References: <20240116041054.11641-1-nylon.chen@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The `frac` variable represents the pulse inactive time, and the result of this algorithm is the pulse active time. Therefore, we must reverse the = result. The reference is SiFive FU740-C000 Manual[0] Link: https://sifive.cdn.prismic.io/sifive/1a82e600-1f93-4f41-b2d8-86ed8b16= acba_fu740-c000-manual-v1p6.pdf [0] Co-developed-by: Zong Li Signed-off-by: Zong Li Co-developed-by: Vincent Chen Signed-off-by: Vincent Chen Signed-off-by: Nylon Chen --- drivers/pwm/pwm-sifive.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c index eabddb7c7820..b07c8598bb21 100644 --- a/drivers/pwm/pwm-sifive.c +++ b/drivers/pwm/pwm-sifive.c @@ -113,6 +113,7 @@ static int pwm_sifive_get_state(struct pwm_chip *chip, = struct pwm_device *pwm, u32 duty, val; =20 duty =3D readl(ddata->regs + PWM_SIFIVE_PWMCMP(pwm->hwpwm)); + duty =3D (1U << PWM_SIFIVE_CMPWIDTH) - 1 - duty; =20 state->enabled =3D duty > 0; =20 @@ -123,11 +124,10 @@ static int pwm_sifive_get_state(struct pwm_chip *chip= , struct pwm_device *pwm, state->period =3D ddata->real_period; state->duty_cycle =3D (u64)duty * ddata->real_period >> PWM_SIFIVE_CMPWIDTH; - state->polarity =3D PWM_POLARITY_INVERSED; + state->polarity =3D PWM_POLARITY_NORMAL; =20 return 0; } - static int pwm_sifive_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { @@ -139,7 +139,7 @@ static int pwm_sifive_apply(struct pwm_chip *chip, stru= ct pwm_device *pwm, int ret =3D 0; u32 frac; =20 - if (state->polarity !=3D PWM_POLARITY_INVERSED) + if (state->polarity !=3D PWM_POLARITY_NORMAL) return -EINVAL; =20 cur_state =3D pwm->state; @@ -159,6 +159,7 @@ static int pwm_sifive_apply(struct pwm_chip *chip, stru= ct pwm_device *pwm, frac =3D DIV64_U64_ROUND_CLOSEST(num, state->period); /* The hardware cannot generate a 100% duty cycle */ frac =3D min(frac, (1U << PWM_SIFIVE_CMPWIDTH) - 1); + frac =3D (1U << PWM_SIFIVE_CMPWIDTH) - 1 - frac; =20 mutex_lock(&ddata->lock); if (state->period !=3D ddata->approx_period) { --=20 2.42.0 From nobody Wed Dec 17 09:45:01 2025 Received: from mail-ot1-f41.google.com (mail-ot1-f41.google.com [209.85.210.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DEDDE10A2A for ; Tue, 16 Jan 2024 04:11:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=sifive.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sifive.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sifive.com header.i=@sifive.com header.b="gS8mDw+N" Received: by mail-ot1-f41.google.com with SMTP id 46e09a7af769-6dddba43d70so4657673a34.1 for ; Mon, 15 Jan 2024 20:11:23 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sifive.com; s=google; t=1705378283; x=1705983083; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=nYo9wXWOZdh4xBQbuTEOxrcqZQMwofEU/9c/S0MDuwU=; b=gS8mDw+N0vl5VxlTMOykZ6FXiQKiZHSNmUcHzeZnM3hFM5Iv0J9/gfdAg6g+Ltlk9n tuMFXI39vsauahLQDcmXYsnzUM0kPp3MoVGMyjO99Yru0eCjkV14Cn3qGWNkwwJVCBbf Vi0ZwU2iH8n1/IhTp/ugdF0WcyoVrWdTf1R3Vk3vvbr1pYVl7FJ7O8Q2KGldkcpOmH9t 6pptrDMM4Z6DUpRTwi9zqWcD3ob0IqktCwNfMSOex1Qwi2KuT9W9U7kIiGAJh9SL5hyG ejulNh3cNfm0qNNnCeyeRWhwL/iDMo5J+wtqicp0EfX3v0C+HTj5/TqjQORv1+8cOwGP 9LhA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1705378283; x=1705983083; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=nYo9wXWOZdh4xBQbuTEOxrcqZQMwofEU/9c/S0MDuwU=; b=Poyi1nNzyZ92IQBVo8X5hmQhXzyMk9PXYijfe5gt9HpCv5jXzSA/2/7APTp8I5K4TP TaouCXO86ACxAndCJMOOFZ5E9kJq++oO6WdWG+ZYJMuzLIaQAxq8aNkcmLvk+FtGNdvC g0QqH5CemiGZOCIF+OAoMTgGFbm+Mxj/zE+cgbFDV4bsiwPM1eWDHKbRn334WEKar1HN 2XZf38O7KntoRCa/LzUGNVYK2GUcdrHZBgh7zUM3xfJM/jcCYfM1kC6/jY91Z8lrZ98J Ou1gumCAMoSbuKWqZCxEQITQx7qVx3qfOm4EiInIiS8YseYyKoznkADemedCNKXHr7j7 iiVg== X-Gm-Message-State: AOJu0YzmCzDcCArj9G+//MXVa8rXUzzbqdeIkxNU+vHwIDv/nIe81uCM eX+4l1eDnebiG/c3YtRGArT3KuPa5OHo+g== X-Google-Smtp-Source: AGHT+IHY8wqSPbSfWTDr8kZnGoqer2JRIbsG2vuaQFhUvm3Jtx2vE59XTqMvUSiKzXWuROP6xyBF3Q== X-Received: by 2002:a05:6358:924:b0:175:d42f:6c63 with SMTP id r36-20020a056358092400b00175d42f6c63mr4731065rwi.36.1705378282820; Mon, 15 Jan 2024 20:11:22 -0800 (PST) Received: from hsinchu15.internal.sifive.com (59-124-168-89.hinet-ip.hinet.net. [59.124.168.89]) by smtp.gmail.com with ESMTPSA id e3-20020a056a0000c300b006da14f68ac1sm8348585pfj.198.2024.01.15.20.11.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Jan 2024 20:11:22 -0800 (PST) From: Nylon Chen To: paul.walmsley@sifive.com, palmer@dabbelt.com, conor+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, robh+dt@kernel.org, u.kleine-koenig@pengutronix.de, thierry.reding@gmail.com, aou@eecs.berkeley.edu Cc: zong.li@sifve.com, vincent.chen@sifive.com, linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, nylon7717@gmail.com, Nylon Chen Subject: [v6 3/3] pwm: sifive: Fix the error in the idempotent test within the pwm_apply_state_debug function Date: Tue, 16 Jan 2024 12:10:54 +0800 Message-ID: <20240116041054.11641-4-nylon.chen@sifive.com> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20240116041054.11641-1-nylon.chen@sifive.com> References: <20240116041054.11641-1-nylon.chen@sifive.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Round the result to the nearest whole number. This ensures that real_period is always a reasonable integer that is not lower than the actual value. e.g. $ echo 110 > /sys/devices/platform/led-controller-1/leds/d12/brightness $ .apply is not idempotent (ena=3D1 pol=3D0 1739692/4032985) -> (ena=3D1 po= l=3D0 1739630/4032985) Co-developed-by: Zong Li Signed-off-by: Zong Li Signed-off-by: Nylon Chen --- drivers/pwm/pwm-sifive.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pwm/pwm-sifive.c b/drivers/pwm/pwm-sifive.c index b07c8598bb21..7cf7a76cdb44 100644 --- a/drivers/pwm/pwm-sifive.c +++ b/drivers/pwm/pwm-sifive.c @@ -101,7 +101,7 @@ static void pwm_sifive_update_clock(struct pwm_sifive_d= data *ddata, =20 /* As scale <=3D 15 the shift operation cannot overflow. */ num =3D (unsigned long long)NSEC_PER_SEC << (PWM_SIFIVE_CMPWIDTH + scale); - ddata->real_period =3D div64_ul(num, rate); + ddata->real_period =3D DIV_ROUND_UP_ULL(num, rate); dev_dbg(ddata->chip.dev, "New real_period =3D %u ns\n", ddata->real_period); } --=20 2.42.0