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Thu, 2 Nov 2023 12:17:10 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.37; Thu, 2 Nov 2023 12:17:09 +0300 From: Alexey Romanov To: , , , CC: , , Alexey Romanov Subject: [PATCH v2 2/2] rng: add dm_rng_read_default() helper Date: Thu, 2 Nov 2023 12:16:45 +0300 Message-ID: <20231102091648.40520-3-avromanov@salutedevices.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231102091648.40520-1-avromanov@salutedevices.com> References: <20231102091648.40520-1-avromanov@salutedevices.com> MIME-Version: 1.0 X-Originating-IP: [100.64.160.123] X-ClientProxiedBy: p-i-exch-sc-m02.sberdevices.ru (172.16.192.103) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181068 [Nov 02 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: avromanov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 543 543 1e3516af5cdd92079dfeb0e292c8747a62cb1ee4, {Tracking_from_domain_doesnt_match_to}, 100.64.160.123:7.1.2; p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1; salutedevices.com:7.1.1; d41d8cd98f00b204e9800998ecf8427e.com:7.1.1; 127.0.0.199:7.1.2, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/02 06:57:00 #22385341 X-KSMG-AntiVirus-Status: Clean, skipped X-Mailman-Approved-At: Thu, 02 Nov 2023 13:57:39 +0100 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean Add dm_rng_read_default() function, which obtain a series of random bytes. In some cases, such function would be useful because it allows the caller to abstract away from RNG device. Signed-off-by: Alexey Romanov --- drivers/rng/rng-uclass.c | 18 ++++++++++++++++++ include/rng.h | 10 ++++++++++ 2 files changed, 28 insertions(+) diff --git a/drivers/rng/rng-uclass.c b/drivers/rng/rng-uclass.c index d7236b9335..e298623e1d 100644 --- a/drivers/rng/rng-uclass.c +++ b/drivers/rng/rng-uclass.c @@ -35,6 +35,24 @@ int dm_rng_read(struct udevice *dev, void *buffer, size_t size) return ops->read(dev, buffer, size); } +int dm_rng_read_default(void *buffer, size_t size) +{ + struct udevice *rng; + int ret; + + ret = platform_get_rng_device(&rng); + if (ret) + return ret; + + ret = dm_rng_read(rng, buffer, size); + if (ret) { + pr_err("Can't read from RNG device (%d)\n", ret); + return ret; + } + + return 0; +} + UCLASS_DRIVER(rng) = { .name = "rng", .id = UCLASS_RNG, diff --git a/include/rng.h b/include/rng.h index 255c85d3e8..6412fedad2 100644 --- a/include/rng.h +++ b/include/rng.h @@ -20,6 +20,16 @@ struct udevice; */ int dm_rng_read(struct udevice *dev, void *buffer, size_t size); +/** + * dm_rng_read_default() - same as dm_rng_read(), except that caller + * don't need to pass an argument with RNG udevice. + * @buffer: input buffer to put the read random seed into + * @size: number of bytes of random seed read + * + * Return: 0 if OK, -ve on error + */ +int dm_rng_read_default(void *buffer, size_t size); + /** * platform_get_rng_device() - retrieve random number generator *