From patchwork Sat Aug 24 14:09:46 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 1152647 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=gmx.net Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=gmx.net header.i=@gmx.net header.b="I/KsoGp7"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46G0XL0nHvz9sBF for ; Sun, 25 Aug 2019 00:10:09 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727668AbfHXOKJ (ORCPT ); Sat, 24 Aug 2019 10:10:09 -0400 Received: from mout.gmx.net ([212.227.15.19]:36031 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727665AbfHXOKJ (ORCPT ); Sat, 24 Aug 2019 10:10:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1566655798; bh=Gw0uvY9zV94pNModeowkG7ft0KsjTu+9nSEiRmDoueo=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=I/KsoGp7RsJ91JRFXS5dPd+dcnqIL2qgjjBYovEMV0dNcvw7qQ1UHZywX5j08VKDs njcR2bXyTHzj3q8LkH7zu3mi9oqNFV48pPAUaKbJtHcm67rYNWNKi5BjJl9VeCQ3D5 nwxu2raHO3CFo8I3fDGr4aaof2cpF9AWVqFT6IF0= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from localhost.localdomain ([37.4.249.106]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1N95e9-1iGDcv05OJ-0169B9; Sat, 24 Aug 2019 16:09:58 +0200 From: Stefan Wahren To: Thierry Reding , Eric Anholt , Florian Fainelli , Ray Jui , Scott Branden Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH V2 1/3] pwm: bcm2835: suppress error message for invalid period_ns Date: Sat, 24 Aug 2019 16:09:46 +0200 Message-Id: <1566655788-24949-2-git-send-email-wahrenst@gmx.net> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> References: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:fddocn95lqFR/2NouKKedgB4+IDR2qPI8KHoNbsqdP4ouU+F1eh j6b5ucNtQpz6aal5CGHWp1O5FRd6jNVF2ZI4swmnGYJ28hsEgBez/rEjJUs0aiXH22/bdG9 0VxfIZbWDaxlSCGLLJ/7heooFlTXal24wuswUrhH9k/170U1dFs4xnJrTbvzIWapZ/ubujW EUunYkaCatNkUsQPGf0jQ== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1; V03:K0:4sKyPc6fcIg=:UKPqGFFRGs8RbS/7w3zeZn GZPqkRoyMOXlWVCiZ6oJ6GlcnyOK1ij6VzRJ/30QxMLbtW0kPyAsGMDPh6HlFw0ayWG4TG+dr ynrSl6w85sfUK6VhlWALYmWe5w1QdarIL0Uy0sm/G3MUxqfWkkgGhBRRoCYvMdWx8sGevH4hz bPL3I5H3diXukgRYox+xIZ9DLxt6hUO/0jGqYMgrgEPjQ3bTODcrmTcbsOga1fb750Vkv0MH3 46xDmjtiYIQJCLPYIRTRBjdeF53HMk4Qa/5QfNE2x7q54mAAdcvVQ2jXFqrqA/VtCUXuBLHhz ZvNe5OuGZEYZOhzyqGCo0UgFWuEYAAt0dz//emGhReYxlUkBTGyDEHMzsYamyDl51d8VnJV+B gEub3ivyGSrGKD5zPmOODmdy49L0QTLoxYHnKZ/hxLy7nBI+vM00eIvoLTqoH0y+b9oRj4j86 z3U/LIzOmPgH2Aq1R7Ipj3518atDOE8v1vD0KMRJpo5xjqhCKYVwBgwet0lSN4EE6KLpzFe6R p94vzHy1CLkriJEUECNDuCSSdlBLkZVbLGmJqxXdINRuk1n0aKLkNGcHl/tQJKkqOtBkzKY6M NcQMT2kxzq6T/rdAmp5N+aaIToi3smX12VORQLN/V/NeQ9KbITu9aplZOyXiJEHBzcnRHq+Qw OmNVMkkhEbdCzhye2d1fq+1SjIwcgFoT2d4SWxp2LDZl34kHB7c/kOVhLSkfF4lajtvCIi3ho Cov9V1FsKptAk5FhRsO0ujhohkaxVi4jfRqAuFaQCtU00AV2ORmHcOT6TAAIpCXuWNb5C8Cs+ f5HC/3tT+B7FzA6JOAuCUFW/TaJ0f1a5cdrICc3z8aq7wwJF9cb6hoXV4RaS3Hoxe8TvwldwX jYQz2HhQphwAWJGIsmvc/al9E0Bz7gH1c/zRDPjNil6GqFF6UzVcrrVZG13UDJVFfbaSfCMyQ OGa1C99Qr2kXLHW4cp0mWRe3blDnRlUJvWSqHEQ2N6MtO7bUZvYuJFkEh5KRqsF4UXiQHM/EN 6k/j9MmHJiPLom/nhopBwlCRr/QJhK1wQnpy6ADdlxonYd275NOCZpVp1mJcAvMyDuBPAYJpP adjny2zaBuTKwsg6ps4zBHw6L3runIuC7BNZXRn4YBjJa7akICsjwhbTWY1G8MpST5XAxqvXX oPzfs= Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The PWM config can be triggered via sysfs, so we better suppress the error message in case of an invalid period to avoid kernel log spamming. Signed-off-by: Stefan Wahren Acked-by: Uwe Kleine-König --- drivers/pwm/pwm-bcm2835.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) -- 2.7.4 diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index f6fe0b9..5276306 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -72,11 +72,8 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, scaler = DIV_ROUND_CLOSEST(NSEC_PER_SEC, rate); - if (period_ns <= MIN_PERIOD) { - dev_err(pc->dev, "period %d not supported, minimum %d\n", - period_ns, MIN_PERIOD); + if (period_ns <= MIN_PERIOD) return -EINVAL; - } writel(DIV_ROUND_CLOSEST(duty_ns, scaler), pc->base + DUTY(pwm->hwpwm)); From patchwork Sat Aug 24 14:09:47 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 1152649 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=gmx.net Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=gmx.net header.i=@gmx.net header.b="FPLvHF3F"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46G0XS2nLDz9sMr for ; Sun, 25 Aug 2019 00:10:16 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727665AbfHXOKN (ORCPT ); Sat, 24 Aug 2019 10:10:13 -0400 Received: from mout.gmx.net ([212.227.15.15]:54939 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727679AbfHXOKN (ORCPT ); Sat, 24 Aug 2019 10:10:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1566655798; bh=p0356BK30yaqXao28qVvueaMUHmiPXaegoIWDiukDy4=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=FPLvHF3F1eQfEPy73mmnsP53NAh3u0jSpEB6+THailv4zEuzdwna+GR2Qdwomhdbg b57U7oFf2mC0Mp1JqCC+7e+h8yQ4TXj3KWUZlQyO1R0CjYS3ucmkUCnNOtwIBFbWpS pP0p5ffueiouSsEgYGkVPJTHYLQlZqJzfjJ67JXo= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from localhost.localdomain ([37.4.249.106]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1M9FjR-1i7Jcv1UNL-006NXj; Sat, 24 Aug 2019 16:09:58 +0200 From: Stefan Wahren To: Thierry Reding , Eric Anholt , Florian Fainelli , Ray Jui , Scott Branden Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH V2 2/3] pwm: bcm2835: fix period_ns range check Date: Sat, 24 Aug 2019 16:09:47 +0200 Message-Id: <1566655788-24949-3-git-send-email-wahrenst@gmx.net> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> References: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> MIME-Version: 1.0 X-Provags-ID: V03:K1:k1uKE8Vftkrl/41pYV+oH5xV1tYyIKl3SA79jsJlrEm/znGfmxb vPUsPCH8MQooBxIiiEtewqIVeYrGjl3jviqP8jmvZ4IlQI5NOg1gyUr+zVhtmGMIpwqQRZC ofGmes5DadQ5HKqt55IRir7pgwGeU17r3lXenKeizqsDayV8WzJd3enSOaz2Q1IHKEoWEZI /cEL5M9rYiEhlcyJNz4qg== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1; V03:K0:3tPCBJyhJdI=:xOSDLVNwC7SqyhMgU539A4 7aeaknVIaXPH9QUXP+JzCWJXnrgxEiPxDbAFFprte/SEx9E41q9NsACEuv/bJIDAz7IgKCQIE xsJPJ8Ec/KhuvP59+sQ2DWHqEZUwhxqT+sGpZoQXVnc4P4DcqIhex/hbANU0We4xHbPB0BEHN xMHwdeG+q1XRtNy6+fznb3KD83w9M6lgfj0y+fIBzz7q2vqsmNo5rgOPLsGa1/B+K7k3RZZvi AEy2V2f0DAGjD2EXt5j9Ad9ZBDlCphG+SfE+OzQLTK1R16jOBAEmheJ5Aen10pfd4MViMz4j8 Qzt1qWlYi4zIwVcQQop1rN8/E1t+vlC7Pq6xfUJl8fJzGqHjj3kN5oByfs96JSu9sS4EQvdDy GSSoJ4HKUj6RJu8RFMSvVsOaanXzxAsTZ2k/5OHrb9af4ftw/0PFjjTEl9U4EIvq03cOOddhN 5n5f01B0uLJFwK3FcA9vSjmRCmnav5CnXdoOD0YabC/PvHh/lxSFeSPY3icNjKoZH+ftb/iBe NuUzTTshP8lvnw1e7FqWF93HaxY90QeMxWJB4QX0Oi6A0saQetB5kbWKizf9UU12Qh5UsUc5B j5dR5IQIYUUf7Gutpo6OOXtJMdHPsdkkLin4eKPI2Q2douWFpkNce1ry8wtGqOyLeVZF33+hY rp+ao2uxWBjPwH5BjSbBEa9LPh6LdNb8jneD3qfcCeLx5qUswjq8ZUmNnTYMlE10+LmnYwDIt HYC7Wrodh/T9+w8Y4OwxVySrPVTgCLmV+6RwXgVHSaquks5+iZQNtMQPoLjGGkrNHsZdJrs5R fTi4+mYJhZphoXQWtAb0HJwJR747kG1BTIHruaz8I0U6Pp35OTyPYF4/owfYnqpOcU4Rf5kSy dA6fwsSZPEmFv4feyM4a3Kt9RyOZ1pnLzVszETdsgD0C1mf0O0yhuxQVbPivL3qeMBW0xtGzu XLYc0UkREnqb4iOAlbGdJyaHwN9Om26iGTDlAC09XYONa70aiaiH3zmGIaXcyk1cUYJYonG8O eBBp0XgAyGrNxXKiEZxH6oGoqbetllotSHBodJhn+0AINbHobSTjn+os+2IyqUNnEGkOZ9GsM GZmzu6LguSop88VdH8YBidqW6ErftZObrgFaxEKvgLeZjlE1255qNN95ouM7RVMIgTXi8TIyd 4Jkoo= Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org The range check for period_ns was written under assumption of a fixed PWM clock. With clk-bcm2835 driver the PWM clock is a dynamic one. So fix this by doing the range check on the period register value. Signed-off-by: Stefan Wahren Acked-by: Uwe Kleine-König --- drivers/pwm/pwm-bcm2835.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) -- 2.7.4 diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index 5276306..2c82386 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -21,7 +21,7 @@ #define PERIOD(x) (((x) * 0x10) + 0x10) #define DUTY(x) (((x) * 0x10) + 0x14) -#define MIN_PERIOD 108 /* 9.2 MHz max. PWM clock */ +#define PERIOD_MIN 0x2 struct bcm2835_pwm { struct pwm_chip chip; @@ -64,6 +64,7 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, struct bcm2835_pwm *pc = to_bcm2835_pwm(chip); unsigned long rate = clk_get_rate(pc->clk); unsigned long scaler; + u32 period; if (!rate) { dev_err(pc->dev, "failed to get clock rate\n"); @@ -71,14 +72,14 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, } scaler = DIV_ROUND_CLOSEST(NSEC_PER_SEC, rate); + period = DIV_ROUND_CLOSEST(period_ns, scaler); - if (period_ns <= MIN_PERIOD) + if (period < PERIOD_MIN) return -EINVAL; writel(DIV_ROUND_CLOSEST(duty_ns, scaler), pc->base + DUTY(pwm->hwpwm)); - writel(DIV_ROUND_CLOSEST(period_ns, scaler), - pc->base + PERIOD(pwm->hwpwm)); + writel(period, pc->base + PERIOD(pwm->hwpwm)); return 0; } From patchwork Sat Aug 24 14:09:48 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stefan Wahren X-Patchwork-Id: 1152648 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=gmx.net Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; secure) header.d=gmx.net header.i=@gmx.net header.b="IzQqKi5x"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 46G0XQ35ysz9sBF for ; Sun, 25 Aug 2019 00:10:14 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727682AbfHXOKN (ORCPT ); Sat, 24 Aug 2019 10:10:13 -0400 Received: from mout.gmx.net ([212.227.15.15]:53999 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727665AbfHXOKN (ORCPT ); Sat, 24 Aug 2019 10:10:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1566655798; bh=rRIKSJq9ObxQ/pOOw2ApNgV/oQBg3tBp8gJFC1ntmhM=; h=X-UI-Sender-Class:From:To:Cc:Subject:Date:In-Reply-To:References; b=IzQqKi5xE2IcwK22fDz9kIIEKC3dBzfKooZPjztmD9kUrQpbB3UbgVUshGrC3VatH XoFItX5R1B2QmZD3afTPnoPQRxThEon61Olkw/zoVHMybNUUn3BbbWR87tY0z1EM/N m515wEKPl3KN2Utjz+pl9i2+jrfSZ3Zc8PUGGdoQ= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from localhost.localdomain ([37.4.249.106]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MmDIo-1iS67C2oWe-00i8fo; Sat, 24 Aug 2019 16:09:58 +0200 From: Stefan Wahren To: Thierry Reding , Eric Anholt , Florian Fainelli , Ray Jui , Scott Branden Cc: linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Stefan Wahren Subject: [PATCH V2 3/3] pwm: bcm2835: suppress error message during deferred probe Date: Sat, 24 Aug 2019 16:09:48 +0200 Message-Id: <1566655788-24949-4-git-send-email-wahrenst@gmx.net> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> References: <1566655788-24949-1-git-send-email-wahrenst@gmx.net> X-Provags-ID: V03:K1:32UdlmvSNs+Bubdd9WzEPRfqqlhDYyyRN89kD6V073ChqdNlB8+ oR5pJwySQ84SvsTgYT4srJHSz4V8X3EOCmE/Aj9vIJrYg+81erDalw9X1pj9gGM1YQfmmTZ ugGNNncxu28nqRMMVzVVMf6pwpAGqhnb+zdJypv81Q4nkbnYUArHNWeRn1AFNk8rQBk/v8j mOfC2kdPPNfzfxnLisa3A== X-Spam-Flag: NO X-UI-Out-Filterresults: notjunk:1; V03:K0:fhMKr21ua04=:nJy53uGPEf2MHM+JqTU8D0 Jriu2LbdknOxCIznnwPY19RodlJOyQMU0xdCdvWDiq7fvoeBJ/55CcqTSrngrxlRm56IWpR4Z Dotok7jb8JCrDGmMOmVS8hpIAAXnAsX5ta/36PUVbXkfonpiGWpXJI0KMR4n/nUdAuruiHYsa PSM0lY3q7a5U+1FPnQyC4h1VVqD7FyGmMcqVemgPBK+5d92eM7x/q5nB8wH242samcL+j7m55 NXX8a28F4mYvuHhxz7/8Q+xJk1h7DcPEAvV2g1Su6ppCC9bTSHTIXKzdwMuyp4Vz2YeaWBzUk j6BPdK1HLOYPzv/j0mRnCAsqqMkIZSgGSbvjsBTVuU2XUA2CE4C4DbXHyDkmbU5/GMkKGAx05 ToeTJ6cQgCCbapNd1QrBOzB2GE+VE33BGjz4Op9brjJeFMp7CLLKzwtefXsepdAb47tLk9CrW jy5u+0JsboeqMG6jibmCW5e1Jcm2ZNe+0hFBmoRRD0iKUACkzeESJxXfxidXOPprI2cn0eknv 2kfYbZa7M4kpvTrY35FQ67SnH5sqEA2mfixdOF+EC0slQUvz1+bUHVPm0Tg8e1CMEiITIy62R Y6k8mfHuQekkEPYoDpEtzoSbQrBvuxXpYd2jQgywNLB5WeLPZgqBt4nz0sJekiCJ8hJImy2Zi LlKB+0GYMyu5zc11lle3dZWed9U9x+2A4B+gFOpTCo9JW8j0e4tQTWPqIU/HyTuimlK3BxpPF IIWgKzWBJ+vE0gK1UHNj894y/OQOiRt03f7lXaNHVSojG3am7x+8Rjs0ZRyHBqQxZ880UsvqP grAoGHNnDc0HUMPFSbg4ZH5BBMcP2CVtmkTyN3ML8wUIIJwH5cQHlSifPHD1LFQa2DmlZNt2r 6g+TBuDXEu2mTh7SlgIoI2OqKDezYSuyYFmhn3Z1GdPSmXEqD67tyf3fNCiVVjhe/IKLWL/O4 1XuOUCH00v5XUkLV1h4TJNUaw21y2i0Vyzm3CaXX/ERh5gH6cAfmUvEpihBKuSBt4HYWIFOUG zCRC4DI0j61cbaZvBbuLdMoObHfbjH9si+MEjnBVHMNuI6aE+sLs4JfmySw5zS0T86LMXqrMA r/tGmYwi6p4GsL4kVRm1ZBHpg3y/xwIT2XhQJBWeacKuSSyrlx9zA4NCg== Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org This suppresses error messages in case the PWM clock isn't ready yet. Signed-off-by: Stefan Wahren Reviewed-by: Uwe Kleine-König --- drivers/pwm/pwm-bcm2835.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) -- 2.7.4 diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index 2c82386..91e24f0 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -153,8 +153,11 @@ static int bcm2835_pwm_probe(struct platform_device *pdev) pc->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(pc->clk)) { - dev_err(&pdev->dev, "clock not found: %ld\n", PTR_ERR(pc->clk)); - return PTR_ERR(pc->clk); + ret = PTR_ERR(pc->clk); + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "clock not found: %d\n", ret); + + return ret; } ret = clk_prepare_enable(pc->clk);