Re: [PATCH] mxcmmc: Add the ability to bind a regulator to manage the MMC card voltage

Sascha Hauer
2010-11-02T07:39:49Z

On Tue, Nov 02, 2010 at 01:05:37AM +0100, Alberto Panizzo wrote:
> This implementation is based on the pxamci.c driver and it will
> be used to support the mx31_3ds machine.
>
> Signed-off-by: Alberto Panizzo <maramaopercheseimorto@gmail.com>

Looks good to me

Acked-by: Sascha Hauer <s.hauer@pengutronix.de>

> ---
>
> This patch is based on the pengutronix for-rmk branch and apply to the
> linus tre, version:2.6.37-rc1
>
> ..cc the lists, sorry for the double mail.
>
> drivers/mmc/host/mxcmmc.c | 48 +++++++++++++++++++++++++++++++++++++++-----
> 1 files changed, 42 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/mmc/host/mxcmmc.c b/drivers/mmc/host/mxcmmc.c
> index 350f78e..e4637fc 100644
> --- a/drivers/mmc/host/mxcmmc.c
> +++ b/drivers/mmc/host/mxcmmc.c
> @@ -31,6 +31,7 @@
> #include <linux/clk.h>
> #include <linux/io.h>
> #include <linux/gpio.h>
> +#include <linux/regulator/consumer.h>
>
> #include <asm/dma.h>
> #include <asm/irq.h>
> @@ -141,10 +142,45 @@ struct mxcmci_host {
>
> struct work_struct datawork;
> spinlock_t lock;
> +
> + struct regulator *vcc;
> };
>
> static void mxcmci_set_clk_rate(struct mxcmci_host *host, unsigned int clk_ios);
>
> +static inline void mxcmci_init_ocr(struct mxcmci_host *host)
> +{
> +#ifdef CONFIG_REGULATOR
> + host->vcc = regulator_get(mmc_dev(host->mmc), "vmmc");
> +
> + if (IS_ERR(host->vcc)) {
> + host->vcc = NULL;
> + } else {
> + host->mmc->ocr_avail = mmc_regulator_get_ocrmask(host->vcc);
> + if (host->pdata && host->pdata->ocr_avail)
> + dev_warn(mmc_dev(host->mmc),
> + "pdata->ocr_avail will not be used\n");
> + }
> +#endif
> + if (host->vcc == NULL) {
> + /* fall-back to platform data */
> + if (host->pdata && host->pdata->ocr_avail)
> + host->mmc->ocr_avail = host->pdata->ocr_avail;
> + else
> + host->mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> + }
> +}
> +
> +static inline void mxcmci_set_power(struct mxcmci_host *host, unsigned int vdd)
> +{
> +#ifdef CONFIG_REGULATOR
> + if (host->vcc)
> + mmc_regulator_set_ocr(host->vcc, vdd);
> +#endif
> + if (host->pdata && host->pdata->setpower)
> + host->pdata->setpower(mmc_dev(host->mmc), vdd);
> +}
> +
> static inline int mxcmci_use_dma(struct mxcmci_host *host)
> {
> return host->do_dma;
> @@ -680,9 +716,9 @@ static void mxcmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
> host->cmdat &= ~CMD_DAT_CONT_BUS_WIDTH_4;
>
> if (host->power_mode != ios->power_mode) {
> - if (host->pdata && host->pdata->setpower)
> - host->pdata->setpower(mmc_dev(mmc), ios->vdd);
> + mxcmci_set_power(host, ios->vdd);
> host->power_mode = ios->power_mode;
> +
> if (ios->power_mode == MMC_POWER_ON)
> host->cmdat |= CMD_DAT_CONT_INIT;
> }
> @@ -808,10 +844,7 @@ static int mxcmci_probe(struct platform_device *pdev)
> host->pdata = pdev->dev.platform_data;
> spin_lock_init(&host->lock);
>
> - if (host->pdata && host->pdata->ocr_avail)
> - mmc->ocr_avail = host->pdata->ocr_avail;
> - else
> - mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
> + mxcmci_init_ocr(host);
>
> if (host->pdata && host->pdata->dat3_card_detect)
> host->default_irq_mask =
> @@ -916,6 +949,9 @@ static int mxcmci_remove(struct platform_device *pdev)
>
> mmc_remove_host(mmc);
>
> + if (host->vcc)
> + regulator_put(host->vcc);
> +
> if (host->pdata && host->pdata->exit)
> host->pdata->exit(&pdev->dev, mmc);
>
> --
> 1.6.3.3
>
>
>
>
>

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