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GET /api/patches/2223547/?format=api
{ "id": 2223547, "url": "http://patchwork.ozlabs.org/api/patches/2223547/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/patch/788319f0fff963feca4df3c5fcdd471dcf70ccdf.1776264104.git.u.kleine-koenig@baylibre.com/", "project": { "id": 38, "url": "http://patchwork.ozlabs.org/api/projects/38/?format=api", "name": "Linux PWM development", "link_name": "linux-pwm", "list_id": "linux-pwm.vger.kernel.org", "list_email": "linux-pwm@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<788319f0fff963feca4df3c5fcdd471dcf70ccdf.1776264104.git.u.kleine-koenig@baylibre.com>", "list_archive_url": null, "date": "2026-04-15T14:50:13", "name": "[v1,2/2] pwm: stm32: Make use of mul_u64_u64_div_u64_roundup()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c6314d5b2113f6b4e0845ee35bd263a82ceb128d", "submitter": { "id": 88686, "url": "http://patchwork.ozlabs.org/api/people/88686/?format=api", "name": "Uwe Kleine-König", "email": "u.kleine-koenig@baylibre.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pwm/patch/788319f0fff963feca4df3c5fcdd471dcf70ccdf.1776264104.git.u.kleine-koenig@baylibre.com/mbox/", "series": [ { "id": 500001, "url": "http://patchwork.ozlabs.org/api/series/500001/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/list/?series=500001", "date": "2026-04-15T14:50:11", "name": "pwm: stm32: A rounding fix and a cleanup", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500001/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223547/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223547/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pwm+bounces-8591-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pwm@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=baylibre-com.20251104.gappssmtp.com\n header.i=@baylibre-com.20251104.gappssmtp.com header.a=rsa-sha256\n header.s=20251104 header.b=GRkgRyOZ;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; 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charset=UTF-8", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=2329;\n i=u.kleine-koenig@baylibre.com; h=from:subject:message-id;\n bh=9qJeHZRbSFduELxueyX7SDFPcOQZv0zK9BdhVLKRq8s=;\n b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBp36Wq+0h8W3DUxZQpoIufXzY1woEyJ2vEcI6Ty\n gE7fVgqv/2JATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCad+lqgAKCRCPgPtYfRL+\n TvXYCACHODrtzojzM+GDH+KQoXVs9juGlZQxs8Z09ps0/buJOG5/BuNanRDVteKwiGuD1lPSqw/\n EDTDA7D8CPKFNhCisbvPeHB/EFl1IWJkLsD6M8dXvVdLMNzBhN1lNQtdBbxVI3800i4L5FQEx0n\n HwxnQG082WB04KVIjZ1vTW5Tg/nowjwM10bxYnIW3UOEY0kxAij8/84WzxQ/Nf7VgT4UVuYZnKJ\n /hKuqIua8QIlJmM21WZpG43NSwSQ3rUUSCSvVLBxfVculBsw9zy3STZ2YPJpBL3krO/H3L9DE2G\n FWHIDoN33CFxASh65+tEq68zFKRcnvVpPDM/LBt+F7qFQz3T", "X-Developer-Key": "i=u.kleine-koenig@baylibre.com; a=openpgp;\n fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6", "Content-Transfer-Encoding": "8bit" }, "content": "When the driver was converted to the waveform API the need for this\nfunction arised but at that time this function didn't exist yet. In the\nmeantime it's available, so switch to the global function and drop the\ndriver specific implementation.\n\nSigned-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>\n---\n drivers/pwm/pwm-stm32.c | 27 +++++----------------------\n 1 file changed, 5 insertions(+), 22 deletions(-)", "diff": "diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c\nindex 935257a890b0..c708e4a7ad70 100644\n--- a/drivers/pwm/pwm-stm32.c\n+++ b/drivers/pwm/pwm-stm32.c\n@@ -193,22 +193,6 @@ static int stm32_pwm_round_waveform_tohw(struct pwm_chip *chip,\n \treturn ret;\n }\n \n-/*\n- * This should be moved to lib/math/div64.c. Currently there are some changes\n- * pending to mul_u64_u64_div_u64. Uwe will care for that when the dust settles.\n- */\n-static u64 stm32_pwm_mul_u64_u64_div_u64_roundup(u64 a, u64 b, u64 c)\n-{\n-\tu64 res = mul_u64_u64_div_u64(a, b, c);\n-\t/* Those multiplications might overflow but it doesn't matter */\n-\tu64 rem = a * b - c * res;\n-\n-\tif (rem)\n-\t\tres += 1;\n-\n-\treturn res;\n-}\n-\n static int stm32_pwm_round_waveform_fromhw(struct pwm_chip *chip,\n \t\t\t\t\t struct pwm_device *pwm,\n \t\t\t\t\t const void *_wfhw,\n@@ -223,16 +207,15 @@ static int stm32_pwm_round_waveform_fromhw(struct pwm_chip *chip,\n \t\tu64 ccr_ns;\n \n \t\t/* The result doesn't overflow for rate >= 15259 */\n-\t\twf->period_length_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1),\n-\t\t\t\t\t\t\t\t\t NSEC_PER_SEC, rate);\n+\t\twf->period_length_ns = mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1),\n+\t\t\t\t\t\t\t\t NSEC_PER_SEC, rate);\n \n-\t\tccr_ns = stm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * wfhw->ccr,\n-\t\t\t\t\t\t\t NSEC_PER_SEC, rate);\n+\t\tccr_ns = mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * wfhw->ccr, NSEC_PER_SEC, rate);\n \n \t\tif (wfhw->ccer & TIM_CCER_CCxP(ch + 1)) {\n \t\t\twf->duty_length_ns =\n-\t\t\t\tstm32_pwm_mul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1 - wfhw->ccr),\n-\t\t\t\t\t\t\t\t NSEC_PER_SEC, rate);\n+\t\t\t\tmul_u64_u64_div_u64_roundup(((u64)wfhw->psc + 1) * (wfhw->arr + 1 - wfhw->ccr),\n+\t\t\t\t\t\t\t NSEC_PER_SEC, rate);\n \n \t\t\twf->duty_offset_ns = ccr_ns;\n \t\t} else {\n", "prefixes": [ "v1", "2/2" ] }