From: Vinod Koul Subject: [PATCH 3/3] hwrng: msm - Add support for prng v2 Date: Mon, 18 Jun 2018 19:42:59 +0530 Message-ID: <20180618141259.23141-4-vkoul@kernel.org> References: <20180618141259.23141-1-vkoul@kernel.org> Cc: Matt Mackall , Herbert Xu , Arnd Bergmann , Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org, Vinod Koul To: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org Return-path: In-Reply-To: <20180618141259.23141-1-vkoul@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-crypto.vger.kernel.org Qcom 8996 and later chips support prng v2 where we need to only implement .read callback for hwrng. Add a new table for v2 which supports this and get version required for driver data. Signed-off-by: Vinod Koul --- drivers/char/hw_random/msm-rng.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/char/hw_random/msm-rng.c b/drivers/char/hw_random/msm-rng.c index 7644474035e5..3f509072a6c6 100644 --- a/drivers/char/hw_random/msm-rng.c +++ b/drivers/char/hw_random/msm-rng.c @@ -17,6 +17,7 @@ #include #include #include +#include #include /* Device specific register offsets */ @@ -132,10 +133,16 @@ static struct hwrng msm_rng = { .read = msm_rng_read, }; +static struct hwrng msm_rng_v2 = { + .name = KBUILD_MODNAME, + .read = msm_rng_read, +}; + static int msm_rng_probe(struct platform_device *pdev) { struct resource *res; struct msm_rng *rng; + unsigned int version; int ret; rng = devm_kzalloc(&pdev->dev, sizeof(*rng), GFP_KERNEL); @@ -154,6 +161,9 @@ static int msm_rng_probe(struct platform_device *pdev) return PTR_ERR(rng->clk); rng->hwrng = &msm_rng; + version = (unsigned long)of_device_get_match_data(&pdev->dev); + if (version) + rng->hwrng = &msm_rng_v2; rng->hwrng->priv = (unsigned long)rng; ret = devm_hwrng_register(&pdev->dev, rng->hwrng); @@ -166,7 +176,8 @@ static int msm_rng_probe(struct platform_device *pdev) } static const struct of_device_id msm_rng_of_match[] = { - { .compatible = "qcom,prng", }, + { .compatible = "qcom,prng", .data = (void *)0}, + { .compatible = "qcom,prng-v2", .data = (void *)1}, {} }; MODULE_DEVICE_TABLE(of, msm_rng_of_match); -- 2.14.4