From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from db9outboundpool.messaging.microsoft.com (mail-db9lp0249.outbound.messaging.microsoft.com [213.199.154.249]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (Client CN "mail.global.frontbridge.com", Issuer "MSIT Machine Auth CA 2" (not verified)) by ozlabs.org (Postfix) with ESMTPS id D6D722C021A for ; Mon, 29 Jul 2013 13:49:25 +1000 (EST) From: Haijun Zhang To: , Subject: [PATCH 1/3] mmc:core: parse voltage from device-tree Date: Mon, 29 Jul 2013 10:56:33 +0800 Message-ID: <1375066595-14968-1-git-send-email-Haijun.Zhang@freescale.com> MIME-Version: 1.0 Content-Type: text/plain Cc: scottwood@freescale.com, cjb@laptop.org, AFLEMING@freescale.com, Haijun Zhang , cbouatmailru@gmail.com List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Add function to support get voltage from device-tree. If there are voltage-range specified in device-tree node, this function will parse it and return the avail voltage mask. Signed-off-by: Haijun Zhang --- drivers/mmc/core/core.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/mmc/core.h | 1 + 2 files changed, 49 insertions(+) diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 49a5bca..217cd42 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -27,6 +27,7 @@ #include #include #include +#include #include #include @@ -1196,6 +1197,53 @@ u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max) } EXPORT_SYMBOL(mmc_vddrange_to_ocrmask); +#ifdef CONFIG_OF + +/* + * mmc_of_parse_voltage - return mask of supported voltages + * @host: host whose node should be parsed. + * + * 1. Return zero: voltage-ranges unspecified in device-tree. + * 2. Return negative errno: voltage-range is invalid. + * 3. Return ocr_mask: a mask of voltages that parse from device-tree + * node can be provided to MMC/SD/SDIO devices. + */ + +u32 mmc_of_parse_voltage(struct mmc_host *host) +{ + const u32 *voltage_ranges; + int num_ranges, i; + struct device_node *np; + u32 ocr_mask = 0; + + np = host->parent->of_node; + voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges); + num_ranges = num_ranges / sizeof(*voltage_ranges) / 2; + if (!voltage_ranges || !num_ranges) { + dev_info(host->parent, "OF: voltage-ranges unspecified\n"); + return 0; + } + + for (i = 0; i < num_ranges; i++) { + const int j = i * 2; + u32 mask; + + mask = mmc_vddrange_to_ocrmask(be32_to_cpu(voltage_ranges[j]), + be32_to_cpu(voltage_ranges[j + 1])); + if (!mask) { + dev_err(host->parent, + "OF: voltage-range #%d is invalid\n", i); + return -EINVAL; + } + ocr_mask |= mask; + } + + return ocr_mask; +} +EXPORT_SYMBOL(mmc_of_parse_voltage); + +#endif /* CONFIG_OF */ + #ifdef CONFIG_REGULATOR /** diff --git a/include/linux/mmc/core.h b/include/linux/mmc/core.h index 443243b..107375c 100644 --- a/include/linux/mmc/core.h +++ b/include/linux/mmc/core.h @@ -209,5 +209,6 @@ static inline void mmc_claim_host(struct mmc_host *host) } extern u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max); +extern u32 mmc_of_parse_voltage(struct mmc_host *host); #endif /* LINUX_MMC_CORE_H */ -- 1.8.0