firmware: turris-mox-rwtm: show message about HWRNG registration

stable inclusion
from stable-5.10.52
commit 9436e9001d403b6974d7533554c98cec6de29a84
bugzilla: 175542 https://gitee.com/openeuler/kernel/issues/I4DTKU

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=9436e9001d403b6974d7533554c98cec6de29a84

--------------------------------

[ Upstream commit fae20160 ]

Currently it is hard to determinate if on Armada 3720 device is HWRNG
by running kernel accessible or not. So print information message into
dmesg when HWRNG is available and registration was successful.

Fixes: 389711b3 ("firmware: Add Turris Mox rWTM firmware driver")
Signed-off-by: NPali Rohár <pali@kernel.org>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Signed-off-by: NGregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Acked-by: NWeilong Chen <chenweilong@huawei.com>
Signed-off-by: NChen Jun <chenjun102@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/firmware/turris-mox-rwtm.c

@@ -542,6 +542,8 @@ static int turris_mox_rwtm_probe(struct platform_device *pdev)
 		goto free_channel;
 	}
 
+	dev_info(dev, "HWRNG successfully registered\n");
+
 	return 0;
 
 free_channel: