You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
186 lines
6.0 KiB
186 lines
6.0 KiB
From patchwork Wed Jan 16 13:13:59 2013
|
|
Content-Type: text/plain; charset="utf-8"
|
|
MIME-Version: 1.0
|
|
Content-Transfer-Encoding: 7bit
|
|
Subject: [4/5] mmc: mvsdio: implement a Device Tree binding
|
|
Date: Wed, 16 Jan 2013 13:13:59 -0000
|
|
From: Andrew Lunn <andrew@lunn.ch>
|
|
X-Patchwork-Id: 1987921
|
|
Message-Id: <1358342040-7130-5-git-send-email-andrew@lunn.ch>
|
|
To: Jason Cooper <jason@lakedaemon.net>
|
|
Cc: linux ARM <linux-arm-kernel@lists.infradead.org>,
|
|
linux-mmc@vger.kernel.org, linux@arm.linux.org.uk,
|
|
Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
|
|
Andrew Lunn <andrew@lunn.ch>
|
|
|
|
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
|
|
This patch adds a simple Device Tree binding for the mvsdio driver, as
|
|
well as the necessary documentation for it. Compatibility with non-DT
|
|
platforms is preserved, by keeping the platform_data based
|
|
initialization.
|
|
|
|
We introduce a small difference between non-DT and DT platforms: DT
|
|
platforms are required to provide a clocks = <...> property, which the
|
|
driver uses to get the frequency of the clock that goes to the SDIO
|
|
IP. The behaviour on non-DT platforms is kept unchanged: a clock
|
|
reference is not mandatory, but the clock frequency must be passed in
|
|
the "clock" field of the mvsdio_platform_data structure.
|
|
|
|
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
|
|
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
|
|
Tested-by: Stefan Peter <s.peter@mpl.ch>
|
|
Tested-by: Florian Fainelli <florian@openwrt.org>
|
|
Signed-off-by: Jason Cooper <jason@lakedaemon.net>
|
|
|
|
---
|
|
.../devicetree/bindings/mmc/orion-sdio.txt | 17 ++++++
|
|
drivers/mmc/host/mvsdio.c | 62 +++++++++++++++-----
|
|
2 files changed, 64 insertions(+), 15 deletions(-)
|
|
create mode 100644 Documentation/devicetree/bindings/mmc/orion-sdio.txt
|
|
|
|
--- /dev/null
|
|
+++ b/Documentation/devicetree/bindings/mmc/orion-sdio.txt
|
|
@@ -0,0 +1,17 @@
|
|
+* Marvell orion-sdio controller
|
|
+
|
|
+This file documents differences between the core properties in mmc.txt
|
|
+and the properties used by the orion-sdio driver.
|
|
+
|
|
+- compatible: Should be "marvell,orion-sdio"
|
|
+- clocks: reference to the clock of the SDIO interface
|
|
+
|
|
+Example:
|
|
+
|
|
+ mvsdio@d00d4000 {
|
|
+ compatible = "marvell,orion-sdio";
|
|
+ reg = <0xd00d4000 0x200>;
|
|
+ interrupts = <54>;
|
|
+ clocks = <&gateclk 17>;
|
|
+ status = "disabled";
|
|
+ };
|
|
--- a/drivers/mmc/host/mvsdio.c
|
|
+++ b/drivers/mmc/host/mvsdio.c
|
|
@@ -21,6 +21,8 @@
|
|
#include <linux/irq.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/gpio.h>
|
|
+#include <linux/of_gpio.h>
|
|
+#include <linux/of_irq.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mmc/slot-gpio.h>
|
|
|
|
@@ -681,17 +683,17 @@ mv_conf_mbus_windows(struct mvsd_host *h
|
|
|
|
static int __init mvsd_probe(struct platform_device *pdev)
|
|
{
|
|
+ struct device_node *np = pdev->dev.of_node;
|
|
struct mmc_host *mmc = NULL;
|
|
struct mvsd_host *host = NULL;
|
|
- const struct mvsdio_platform_data *mvsd_data;
|
|
const struct mbus_dram_target_info *dram;
|
|
struct resource *r;
|
|
int ret, irq;
|
|
+ int gpio_card_detect, gpio_write_protect;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
irq = platform_get_irq(pdev, 0);
|
|
- mvsd_data = pdev->dev.platform_data;
|
|
- if (!r || irq < 0 || !mvsd_data)
|
|
+ if (!r || irq < 0)
|
|
return -ENXIO;
|
|
|
|
mmc = mmc_alloc_host(sizeof(struct mvsd_host), &pdev->dev);
|
|
@@ -703,8 +705,37 @@ static int __init mvsd_probe(struct plat
|
|
host = mmc_priv(mmc);
|
|
host->mmc = mmc;
|
|
host->dev = &pdev->dev;
|
|
- host->base_clock = mvsd_data->clock / 2;
|
|
- host->clk = ERR_PTR(-EINVAL);
|
|
+
|
|
+ /* Some non-DT platforms do not pass a clock, and the clock
|
|
+ frequency is passed through platform_data. On DT platforms,
|
|
+ a clock must always be passed, even if there is no gatable
|
|
+ clock associated to the SDIO interface (it can simply be a
|
|
+ fixed rate clock). */
|
|
+ host->clk = devm_clk_get(&pdev->dev, NULL);
|
|
+ if (!IS_ERR(host->clk))
|
|
+ clk_prepare_enable(host->clk);
|
|
+
|
|
+ if (np) {
|
|
+ if (IS_ERR(host->clk)) {
|
|
+ dev_err(&pdev->dev, "DT platforms must have a clock associated\n");
|
|
+ ret = -EINVAL;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ host->base_clock = clk_get_rate(host->clk) / 2;
|
|
+ gpio_card_detect = of_get_named_gpio(np, "cd-gpios", 0);
|
|
+ gpio_write_protect = of_get_named_gpio(np, "wp-gpios", 0);
|
|
+ } else {
|
|
+ const struct mvsdio_platform_data *mvsd_data;
|
|
+ mvsd_data = pdev->dev.platform_data;
|
|
+ if (!mvsd_data) {
|
|
+ ret = -ENXIO;
|
|
+ goto out;
|
|
+ }
|
|
+ host->base_clock = mvsd_data->clock / 2;
|
|
+ gpio_card_detect = mvsd_data->gpio_card_detect;
|
|
+ gpio_write_protect = mvsd_data->gpio_write_protect;
|
|
+ }
|
|
|
|
mmc->ops = &mvsd_ops;
|
|
|
|
@@ -743,20 +774,14 @@ static int __init mvsd_probe(struct plat
|
|
goto out;
|
|
}
|
|
|
|
- /* Not all platforms can gate the clock, so it is not
|
|
- an error if the clock does not exists. */
|
|
- host->clk = devm_clk_get(&pdev->dev, NULL);
|
|
- if (!IS_ERR(host->clk))
|
|
- clk_prepare_enable(host->clk);
|
|
-
|
|
- if (gpio_is_valid(mvsd_data->gpio_card_detect)) {
|
|
- ret = mmc_gpio_request_cd(mmc, mvsd_data->gpio_card_detect);
|
|
+ if (gpio_is_valid(gpio_card_detect)) {
|
|
+ ret = mmc_gpio_request_cd(mmc, gpio_card_detect);
|
|
if (ret)
|
|
goto out;
|
|
} else
|
|
mmc->caps |= MMC_CAP_NEEDS_POLL;
|
|
|
|
- mmc_gpio_request_ro(mmc, mvsd_data->gpio_write_protect);
|
|
+ mmc_gpio_request_ro(mmc, gpio_write_protect);
|
|
|
|
setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host);
|
|
platform_set_drvdata(pdev, mmc);
|
|
@@ -768,7 +793,7 @@ static int __init mvsd_probe(struct plat
|
|
mmc_hostname(mmc), DRIVER_NAME);
|
|
if (!(mmc->caps & MMC_CAP_NEEDS_POLL))
|
|
printk("using GPIO %d for card detection\n",
|
|
- mvsd_data->gpio_card_detect);
|
|
+ gpio_card_detect);
|
|
else
|
|
printk("lacking card detect (fall back to polling)\n");
|
|
return 0;
|
|
@@ -832,12 +857,19 @@ static int mvsd_resume(struct platform_d
|
|
#define mvsd_resume NULL
|
|
#endif
|
|
|
|
+static const struct of_device_id mvsdio_dt_ids[] = {
|
|
+ { .compatible = "marvell,orion-sdio" },
|
|
+ { /* sentinel */ }
|
|
+};
|
|
+MODULE_DEVICE_TABLE(of, mvsdio_dt_ids);
|
|
+
|
|
static struct platform_driver mvsd_driver = {
|
|
.remove = __exit_p(mvsd_remove),
|
|
.suspend = mvsd_suspend,
|
|
.resume = mvsd_resume,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
+ .of_match_table = mvsdio_dt_ids,
|
|
},
|
|
};
|
|
|
|
|