linux-kernel - [PATCH v2 2/3] hwrng: imx-rngc - use bitfield macros to read rng type

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Message-Id: <20230519160433.287161-3-martin@kaiser.cx>
Date:   Fri, 19 May 2023 18:04:32 +0200
From:   Martin Kaiser <martin@...ser.cx>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     linux-crypto@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, Martin Kaiser <martin@...ser.cx>
Subject: [PATCH v2 2/3] hwrng: imx-rngc - use bitfield macros to read rng type

Use the mechanism from bitfield.h to read the rng type field in the
version_id register. This makes the code a tiny bit simpler.

Signed-off-by: Martin Kaiser <martin@...ser.cx>
---
 drivers/char/hw_random/imx-rngc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/char/hw_random/imx-rngc.c b/drivers/char/hw_random/imx-rngc.c
index cf29c323453a..b5f7b91bd13e 100644
--- a/drivers/char/hw_random/imx-rngc.c
+++ b/drivers/char/hw_random/imx-rngc.c
@@ -27,7 +27,7 @@
 #define RNGC_FIFO			0x0014
 
 /* the fields in the ver id register */
-#define RNGC_TYPE_SHIFT		28
+#define RNG_TYPE			GENMASK(31, 28)
 #define RNGC_VER_MAJ_SHIFT		8
 
 /* the rng_type field */
@@ -251,7 +251,7 @@ static int imx_rngc_probe(struct platform_device *pdev)
 		return irq;
 
 	ver_id = readl(rngc->base + RNGC_VER_ID);
-	rng_type = ver_id >> RNGC_TYPE_SHIFT;
+	rng_type = FIELD_GET(RNG_TYPE, ver_id);
 	/*
 	 * This driver supports only RNGC and RNGB. (There's a different
 	 * driver for RNGA.)
-- 
2.30.2