linux-kernel - [RFC 2/2] mmc: sdhci-iproc: Set clock frequency as per DT

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Date:   Thu, 25 Feb 2021 10:52:16 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     linux-arm-kernel@...ts.infradead.org, linux-mmc@...r.kernel.org,
        devicetree@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>
Cc:     f.fainelli@...il.com, phil@...pberrypi.com,
        tim.gover@...pberrypi.com, alcooperx@...il.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [RFC 2/2] mmc: sdhci-iproc: Set clock frequency as per DT

devicetree might request a clock frequency different from whatever is
set-up by the bootloader. Make sure to setup the new rate.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---
 drivers/mmc/host/sdhci-iproc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
index ddeaf8e1f72f..536c382e2486 100644
--- a/drivers/mmc/host/sdhci-iproc.c
+++ b/drivers/mmc/host/sdhci-iproc.c
@@ -358,6 +358,16 @@ static int sdhci_iproc_probe(struct platform_device *pdev)
 			ret = PTR_ERR(pltfm_host->clk);
 			goto err;
 		}
+
+		if (pltfm_host->clock) {
+			ret = clk_set_rate(pltfm_host->clk, pltfm_host->clock);
+			if (ret) {
+				dev_err(dev, "failed to set host clk at %u Hz\n",
+					pltfm_host->clock);
+				goto err;
+			}
+		}
+
 		ret = clk_prepare_enable(pltfm_host->clk);
 		if (ret) {
 			dev_err(dev, "failed to enable host clk\n");
-- 
2.30.1