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mmc: host: sdhci-s3c: Add support for pinctrl

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This patch adds support for pin configuration using pinctrl subsystem
to the sdhci-s3c driver.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Acked-by: Thomas Abraham <thomas.abraham@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Tomasz Figa 2012-11-16 15:28:17 +01:00 committed by Chris Ball
parent b1b8fea94f
commit b96efccb8f
2 changed files with 23 additions and 9 deletions
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20
Documentation/devicetree/bindings/mmc/samsung-sdhci.txt
View File

@ -12,10 +12,6 @@ is used. The Samsung's SDHCI controller bindings extends this as listed below.
[A] The property "samsung,cd-pinmux-gpio" can be used as stated in the
"Optional Board Specific Properties" section below.
[B] If core card-detect bindings and "samsung,cd-pinmux-gpio" property
is not specified, it is assumed that there is no card detection
mechanism used.
Required SoC Specific Properties:
- compatible: should be one of the following
- "samsung,s3c6410-sdhci": For controllers compatible with s3c6410 sdhci
@ -24,14 +20,18 @@ Required SoC Specific Properties:
controller.
Required Board Specific Properties:
- gpios: Should specify the gpios used for clock, command and data lines. The
gpio specifier format depends on the gpio controller.
- Samsung GPIO variant (will be completely replaced by pinctrl):
- gpios: Should specify the gpios used for clock, command and data lines. The
gpio specifier format depends on the gpio controller.
- Pinctrl variant (preferred if available):
- pinctrl-0: Should specify pin control groups used for this controller.
- pinctrl-names: Should contain only one value - "default".
Optional Board Specific Properties:
- samsung,cd-pinmux-gpio: Specifies the card detect line that is routed
through a pinmux to the card-detect pin of the card slot. This property
should be used only if none of the mmc core card-detect properties are
used.
used. Only for Samsung GPIO variant.
Example:
sdhci@12530000 {
@ -40,12 +40,18 @@ Example:
interrupts = <0 75 0>;
bus-width = <4>;
cd-gpios = <&gpk2 2 2 3 3>;
/* Samsung GPIO variant */
gpios = <&gpk2 0 2 0 3>, /* clock line */
<&gpk2 1 2 0 3>, /* command line */
<&gpk2 3 2 3 3>, /* data line 0 */
<&gpk2 4 2 3 3>, /* data line 1 */
<&gpk2 5 2 3 3>, /* data line 2 */
<&gpk2 6 2 3 3>; /* data line 3 */
/* Pinctrl variant */
pinctrl-0 = <&sd0_clk &sd0_cmd &sd0_bus4>;
pinctrl-names = "default";
};
Note: This example shows both SoC specific and board specific properties

12
drivers/mmc/host/sdhci-s3c.c
View File

@ -24,6 +24,7 @@
#include <linux/of_gpio.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/pinctrl/consumer.h>
#include <linux/mmc/host.h>
@ -57,6 +58,7 @@ struct sdhci_s3c {
int ext_cd_irq;
int ext_cd_gpio;
int *gpios;
struct pinctrl *pctrl;
struct clk *clk_io;
struct clk *clk_bus[MAX_BUS_CLK];
@ -484,8 +486,9 @@ static int __devinit sdhci_s3c_parse_dt(struct device *dev,
return -EINVAL;
}
dev_info(dev, "assuming no card detect line available\n");
pdata->cd_type = S3C_SDHCI_CD_NONE;
/* assuming internal card detect that will be configured by pinctrl */
pdata->cd_type = S3C_SDHCI_CD_INTERNAL;
goto setup_bus;
found_cd:
if (pdata->cd_type == S3C_SDHCI_CD_GPIO) {
@ -503,6 +506,9 @@ static int __devinit sdhci_s3c_parse_dt(struct device *dev,
}
setup_bus:
if (!IS_ERR(ourhost->pctrl))
return 0;
/* get the gpios for command, clock and data lines */
for (cnt = 0; cnt < NUM_GPIOS(pdata->max_width); cnt++) {
gpio = of_get_gpio(node, cnt);
@ -581,6 +587,8 @@ static int __devinit sdhci_s3c_probe(struct platform_device *pdev)
goto err_pdata_io_clk;
}
sc->pctrl = devm_pinctrl_get_select_default(&pdev->dev);
if (pdev->dev.of_node) {
ret = sdhci_s3c_parse_dt(&pdev->dev, host, pdata);
if (ret)