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SubjectRe: [PATCH 2/3] mmc: sdhci-of-at91: introduce driver for the Atmel SDMMC
Date
On Friday 03 July 2015 16:17:16 Ludovic Desroches wrote:
> Introduce driver for he Atmel SDMMC available on sama5d2. It is a sdhci
> compliant controller.
>
> Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
> ---
> .../devicetree/bindings/mmc/sdhci-atmel.txt | 21 +++
> drivers/mmc/host/Kconfig | 8 +
> drivers/mmc/host/Makefile | 1 +
> drivers/mmc/host/sdhci-of-at91.c | 188 +++++++++++++++++++++
> 4 files changed, 218 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> create mode 100644 drivers/mmc/host/sdhci-of-at91.c
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> new file mode 100644
> index 0000000..1b662d7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-atmel.txt
> @@ -0,0 +1,21 @@
> +* Atmel SDHCI controller
> +
> +This file documents the differences between the core properties in
> +Documentation/devicetree/bindings/mmc/mmc.txt and the properties used by the
> +sdhci-of-at91 driver.
> +
> +Required properties:
> +- compatible: Must be "atmel,sama5d2-sdhci".
> +- clocks: Phandlers to the clocks.
> +- clock-names: Must be "hclock", "multclk", "baseclk";
> +

Are you sure that these are all new clocks that are unrelated to the "core",
"mmc", and "iface" clocks that are used in other drivers?

> +
> + priv->mainck = devm_clk_get(&pdev->dev, "baseclk");
> + if (IS_ERR(priv->mainck)) {
> + dev_err(&pdev->dev, "failed to get baseclk\n");
> + return PTR_ERR(priv->mainck);
> + }
> +
> + priv->hclock = devm_clk_get(&pdev->dev, "hclock");
> + if (IS_ERR(priv->hclock)) {
> + dev_err(&pdev->dev, "failed to get hclock\n");
> + return PTR_ERR(priv->hclock);
> + }
> +
> + priv->gck = devm_clk_get(&pdev->dev, "multclk");
> + if (IS_ERR(priv->gck)) {
> + dev_err(&pdev->dev, "failed to get multclk\n");
> + return PTR_ERR(priv->gck);
> + }
> +
> + host = sdhci_pltfm_init(pdev, soc_data, 0);
> + if (IS_ERR(host))
> + return PTR_ERR(host);
> +
> + /*
> + * The mult clock is provided by as a generated clock by the PMC
> + * controller. In order to set the rate of gck, we have to get the
> + * base clock rate and the clock mult from capabilities.
> + */
> + clk_prepare_enable(priv->hclock);
> + caps0 = readl(host->ioaddr + SDHCI_CAPABILITIES);
> + caps1 = readl(host->ioaddr + SDHCI_CAPABILITIES_1);
> + clk_base = (caps0 & SDHCI_CLOCK_V3_BASE_MASK) >> SDHCI_CLOCK_BASE_SHIFT;
> + clk_mul = (caps1 & SDHCI_CLOCK_MUL_MASK) >> SDHCI_CLOCK_MUL_SHIFT;
> + gck_rate = clk_base * 1000000 * (clk_mul + 1);
> + ret = clk_set_rate(priv->gck, gck_rate);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to set gck");
> + goto hclock_disable_unprepare;
> + return -EINVAL;
> + }

Could this be shared with other drivers?

Arnd


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