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Date: Wed, 16 Dec 2015 11:48:16 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Joshua Henderson <joshua.henderson@...rochip.com>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
linux-mips@...ux-mips.org, Ralf Baechle <ralf@...ux-mips.org>,
Andrei Pistirica <andrei.pistirica@...rochip.com>,
Jean Delvare <jdelvare@...e.de>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Corneliu Doban <cdoban@...adcom.com>,
Haojian Zhuang <haojian.zhuang@...il.com>,
Luis de Bethencourt <luisbg@....samsung.com>,
Weijun Yang <Weijun.Yang@....com>,
Lokesh Vutla <lokeshvutla@...com>,
Scott Branden <sbranden@...adcom.com>,
Vincent Yang <vincent.yang.fujitsu@...il.com>,
Chaotian Jing <chaotian.jing@...iatek.com>,
"ludovic.desroches@...el.com" <ludovic.desroches@...el.com>,
Shawn Lin <shawn.lin@...k-chips.com>,
Stephen Boyd <sboyd@...eaurora.org>,
yangbo lu <yangbo.lu@...escale.com>,
Kevin Hao <haokexin@...il.com>,
Ben Hutchings <ben@...adent.org.uk>,
Andy Green <andy.green@...aro.org>,
linux-mmc <linux-mmc@...r.kernel.org>
Subject: Re: [PATCH v2 12/14] mmc: sdhci-pic32: Add PIC32 SDHCI host
controller driver
[...]
> +static int pic32_sdhci_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct sdhci_host *host;
> + struct resource *iomem;
> + struct pic32_sdhci_pdata *sdhci_pdata;
> + struct pic32_sdhci_platform_data *plat_data;
> + unsigned int clk_rate = 0;
> + int ret;
> + struct pinctrl *pinctrl;
> +
> + host = sdhci_alloc_host(dev, sizeof(*sdhci_pdata));
> + if (IS_ERR(host)) {
> + ret = PTR_ERR(host);
> + dev_err(&pdev->dev, "cannot allocate memory for sdhci\n");
> + goto err;
> + }
> +
> + sdhci_pdata = sdhci_priv(host);
> + sdhci_pdata->pdev = pdev;
> + platform_set_drvdata(pdev, host);
> +
> + iomem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + host->ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
> + if (IS_ERR(host->ioaddr)) {
> + ret = PTR_ERR(host->ioaddr);
> + dev_err(&pdev->dev, "unable to map iomem: %d\n", ret);
> + goto err_host;
> + }
> +
> + plat_data = pdev->dev.platform_data;
> + if (plat_data && plat_data->setup_dma) {
> + ret = plat_data->setup_dma(ADMA_FIFO_RD_THSHLD,
> + ADMA_FIFO_WR_THSHLD);
> + if (ret)
> + goto err_host;
> + }
> +
> + pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
This isn't need as it's already handled by the PM core.
> + if (IS_ERR(pinctrl)) {
> + ret = PTR_ERR(pinctrl);
> + dev_warn(&pdev->dev, "No pinctrl provided %d\n", ret);
> + if (ret == -EPROBE_DEFER)
> + goto err_host;
> + }
> +
> + host->ops = &pic32_sdhci_ops;
> + host->irq = platform_get_irq(pdev, 0);
> +
> + sdhci_pdata->sys_clk = devm_clk_get(&pdev->dev, "sys_clk");
> + if (IS_ERR(sdhci_pdata->sys_clk)) {
> + ret = PTR_ERR(sdhci_pdata->sys_clk);
> + dev_err(&pdev->dev, "Error getting clock\n");
> + goto err_host;
> + }
> +
> + /* Enable clock when available! */
> + ret = clk_prepare_enable(sdhci_pdata->sys_clk);
> + if (ret) {
> + dev_dbg(&pdev->dev, "Error enabling clock\n");
> + goto err_host;
> + }
> +
> + /* SDH CLK enable */
> + sdhci_pdata->base_clk = devm_clk_get(&pdev->dev, "base_clk");
> + if (IS_ERR(sdhci_pdata->base_clk)) {
> + ret = PTR_ERR(sdhci_pdata->base_clk);
> + dev_err(&pdev->dev, "Error getting clock\n");
> + goto err_host;
> + }
> +
> + /* Enable clock when available! */
> + ret = clk_prepare_enable(sdhci_pdata->base_clk);
> + if (ret) {
> + dev_dbg(&pdev->dev, "Error enabling clock\n");
> + goto err_host;
> + }
> +
> + clk_rate = clk_get_rate(sdhci_pdata->base_clk);
> + dev_dbg(&pdev->dev, "base clock at: %u\n", clk_rate);
> + clk_rate = clk_get_rate(sdhci_pdata->sys_clk);
> + dev_dbg(&pdev->dev, "sys clock at: %u\n", clk_rate);
This looks like some leftover from a debugging task. Can you remove them?
> +
> + host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
> +
> + host->quirks |= SDHCI_QUIRK_NO_HISPD_BIT;
> +
> + ret = mmc_of_parse(host->mmc);
> + if (ret)
>From this point, the error handling doesn't undo clk_prepare_enable().
Please add that.
> + goto err_host;
> +
> + ret = pic32_sdhci_probe_platform(pdev, sdhci_pdata);
> + if (ret) {
> + dev_err(&pdev->dev, "failed to probe platform!\n");
> + goto err_host;
> + }
> +
> + ret = sdhci_add_host(host);
> + if (ret) {
> + dev_dbg(&pdev->dev, "error adding host\n");
> + goto err_host;
> + }
> +
> + dev_info(&pdev->dev, "Successfully added sdhci host\n");
> + return 0;
> +
> +err_host:
> + sdhci_free_host(host);
> +err:
> + dev_err(&pdev->dev, "pic32-sdhci probe failed: %d\n", ret);
> + return ret;
A general comment for the ->probe() and the below ->remove() callback,
is that you should probably be able to convert to use
sdhci_pltfm_init() and sdhci_pltfm_free() in favor of
sdhci_alloc_host() and sdhci_free_host().
I think that could simplify the code a bit.
> +}
> +
> +static int pic32_sdhci_remove(struct platform_device *pdev)
> +{
> + struct sdhci_host *host = platform_get_drvdata(pdev);
> + struct pic32_sdhci_pdata *sdhci_pdata = sdhci_priv(host);
> + int dead = 0;
> + u32 scratch;
> +
> + scratch = readl(host->ioaddr + SDHCI_INT_STATUS);
> + if (scratch == (u32)-1)
> + dead = 1;
> +
> + sdhci_remove_host(host, dead);
> + clk_disable_unprepare(sdhci_pdata->base_clk);
> + clk_disable_unprepare(sdhci_pdata->sys_clk);
> + sdhci_free_host(host);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id pic32_sdhci_id_table[] = {
> + { .compatible = "microchip,pic32mzda-sdhci" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, pic32_sdhci_id_table);
> +
> +static struct platform_driver pic32_sdhci_driver = {
> + .driver = {
> + .name = DEV_NAME,
> + .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(pic32_sdhci_id_table),
> + },
> + .probe = pic32_sdhci_probe,
> + .remove = pic32_sdhci_remove,
> +};
> +
> +module_platform_driver(pic32_sdhci_driver);
> +
> +MODULE_DESCRIPTION("Microchip PIC32 SDHCI driver");
> +MODULE_AUTHOR("Pistirica Sorin Andrei & Sandeep Sheriker");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5
>
Kind regards
Uffe
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