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Date: Thu, 17 Dec 2015 18:05:24 +0000
From: <Paul.Thacker@...rochip.com>
To: <ulf.hansson@...aro.org>, <Joshua.Henderson@...rochip.com>
CC: <linux-kernel@...r.kernel.org>, <linux-mips@...ux-mips.org>,
<ralf@...ux-mips.org>, <Andrei.Pistirica@...rochip.com>,
<jdelvare@...e.de>, <geert@...ux-m68k.org>, <cdoban@...adcom.com>,
<haojian.zhuang@...il.com>, <luisbg@....samsung.com>,
<Weijun.Yang@....com>, <lokeshvutla@...com>,
<sbranden@...adcom.com>, <vincent.yang.fujitsu@...il.com>,
<chaotian.jing@...iatek.com>, <ludovic.desroches@...el.com>,
<shawn.lin@...k-chips.com>, <sboyd@...eaurora.org>,
<yangbo.lu@...escale.com>, <haokexin@...il.com>,
<ben@...adent.org.uk>, <andy.green@...aro.org>,
<linux-mmc@...r.kernel.org>
Subject: RE: [PATCH v2 12/14] mmc: sdhci-pic32: Add PIC32 SDHCI host
controller driver
On 12/16/2015 3:48 AM, Ulf Hansson wrote:
>
> [...]
>
> > +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.
Ack. Will remove.
>
> > + 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?
>
Yes, these are not needed and will be removed.
> > +
> > + 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.
Ack. Will do.
>
> > + 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.
Ok. Will do.
>
> > +}
> > +
> > +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
Thanks,
Paul
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