From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754540AbdEQW3X (ORCPT ); Wed, 17 May 2017 18:29:23 -0400 Received: from mail-pf0-f174.google.com ([209.85.192.174]:33659 "EHLO mail-pf0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754365AbdEQW3Q (ORCPT ); Wed, 17 May 2017 18:29:16 -0400 From: Rick Altherr To: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , Herbert Xu , Matt Mackall Subject: [PATCH v1 2/2] hw_random: timeriomem_rng: Allow setting RNG quality from platform data Date: Wed, 17 May 2017 15:29:11 -0700 Message-Id: <20170517222911.9295-2-raltherr@google.com> X-Mailer: git-send-email 2.13.0.303.g4ebf302169-goog In-Reply-To: <20170517222911.9295-1-raltherr@google.com> References: <20170517222911.9295-1-raltherr@google.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When a hw_random device's quality is non-zero, it will automatically be used to fill the kernel's entropy pool. Since timeriomem_rng is used by many different devices, the quality needs to be provided by platform data or device tree. Signed-off-by: Rick Altherr --- drivers/char/hw_random/timeriomem-rng.c | 7 +++++++ include/linux/timeriomem-rng.h | 3 +++ 2 files changed, 10 insertions(+) diff --git a/drivers/char/hw_random/timeriomem-rng.c b/drivers/char/hw_random/timeriomem-rng.c index a0faa5f05deb..03ff5483d865 100644 --- a/drivers/char/hw_random/timeriomem-rng.c +++ b/drivers/char/hw_random/timeriomem-rng.c @@ -151,8 +151,15 @@ static int timeriomem_rng_probe(struct platform_device *pdev) dev_err(&pdev->dev, "missing period\n"); return -EINVAL; } + + if (!of_property_read_u32(pdev->dev.of_node, + "quality", &i)) + priv->rng_ops.quality = i; + else + priv->rng_ops.quality = 0; } else { period = pdata->period; + priv->rng_ops.quality = pdata->quality; } priv->period = ns_to_ktime(period * NSEC_PER_USEC); diff --git a/include/linux/timeriomem-rng.h b/include/linux/timeriomem-rng.h index 46eb27ddbfab..320f743bf06b 100644 --- a/include/linux/timeriomem-rng.h +++ b/include/linux/timeriomem-rng.h @@ -13,4 +13,7 @@ struct timeriomem_rng_data { /* measures in usecs */ unsigned int period; + + /* bits of entropy per 1000 bits read */ + unsigned int quality; }; -- 2.13.0.303.g4ebf302169-goog