[PATCH 04/20] ARM: pxa: ssp: add DT bindings
Daniel Mack
zonque at gmail.com
Wed Aug 7 11:33:53 EDT 2013
This patch adds DT bindings for the pxa ssp driver.
Signed-off-by: Daniel Mack <zonque at gmail.com>
---
.../devicetree/bindings/serial/mrvl,pxa-ssp.txt | 43 ++++++++++
arch/arm/plat-pxa/ssp.c | 93 +++++++++++++++++-----
2 files changed, 115 insertions(+), 21 deletions(-)
create mode 100644 Documentation/devicetree/bindings/serial/mrvl,pxa-ssp.txt
diff --git a/Documentation/devicetree/bindings/serial/mrvl,pxa-ssp.txt b/Documentation/devicetree/bindings/serial/mrvl,pxa-ssp.txt
new file mode 100644
index 0000000..9f642f0
--- /dev/null
+++ b/Documentation/devicetree/bindings/serial/mrvl,pxa-ssp.txt
@@ -0,0 +1,43 @@
+Device tree bindings for Marvell PXA SSP ports
+
+Required properties:
+
+ - compatible: Must be one of
+ mrvl,pxa25x-ssp
+ mvrl,pxa25x-nssp
+ mrvl,pxa27x-ssp
+ mrvl,pxa3xx-ssp
+ mvrl,pxa168-ssp
+ mrvl,pxa910-ssp
+ mrvl,ce4100-ssp
+ mrvl,lpss-ssp
+
+ - reg: The memory base
+
+
+Example for PXA3xx:
+
+ ssp at 41000000 {
+ compatible = "mrvl,pxa27x-ssp";
+ reg = <0x41000000 0x40>;
+ interrupts = <24>;
+ };
+
+ ssp at 41700000 {
+ compatible = "mrvl,pxa27x-ssp";
+ reg = <0x41700000 0x40>;
+ interrupts = <16>;
+ };
+
+ ssp at 41900000 {
+ compatible = "mrvl,pxa27x-ssp";
+ reg = <0x41900000 0x40>;
+ interrupts = <0>;
+ };
+
+ ssp at 41a00000 {
+ compatible = "mrvl,pxa27x-ssp";
+ reg = <0x41a00000 0x40>;
+ interrupts = <13>;
+ };
+
diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
index a503ea0..7628e85 100644
--- a/arch/arm/plat-pxa/ssp.c
+++ b/arch/arm/plat-pxa/ssp.c
@@ -30,12 +30,15 @@
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <asm/irq.h>
#include <mach/hardware.h>
static DEFINE_MUTEX(ssp_lock);
static LIST_HEAD(ssp_list);
+static unsigned int ssp_count;
struct ssp_device *pxa_ssp_request(int port, const char *label)
{
@@ -72,9 +75,23 @@ void pxa_ssp_free(struct ssp_device *ssp)
}
EXPORT_SYMBOL(pxa_ssp_free);
+#ifdef CONFIG_OF
+static const struct of_device_id pxa_ssp_of_ids[] = {
+ { .compatible = "mrvl,pxa25x-ssp", .data = (void *) PXA25x_SSP },
+ { .compatible = "mvrl,pxa25x-nssp", .data = (void *) PXA25x_NSSP },
+ { .compatible = "mrvl,pxa27x-ssp", .data = (void *) PXA27x_SSP },
+ { .compatible = "mrvl,pxa3xx-ssp", .data = (void *) PXA3xx_SSP },
+ { .compatible = "mvrl,pxa168-ssp", .data = (void *) PXA168_SSP },
+ { .compatible = "mrvl,pxa910-ssp", .data = (void *) PXA910_SSP },
+ { .compatible = "mrvl,ce4100-ssp", .data = (void *) CE4100_SSP },
+ { .compatible = "mrvl,lpss-ssp", .data = (void *) LPSS_SSP },
+ { },
+};
+MODULE_DEVICE_TABLE(of, pxa_ssp_of_ids);
+#endif
+
static int pxa_ssp_probe(struct platform_device *pdev)
{
- const struct platform_device_id *id = platform_get_device_id(pdev);
struct resource *res;
struct ssp_device *ssp;
struct device *dev = &pdev->dev;
@@ -93,21 +110,42 @@ static int pxa_ssp_probe(struct platform_device *pdev)
goto err_free;
}
- res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
- if (res == NULL) {
- dev_err(dev, "no SSP RX DRCMR defined\n");
- ret = -ENODEV;
- goto err_free_clk;
- }
- ssp->drcmr_rx = res->start;
+ if (dev->of_node) {
+ struct of_phandle_args dma_spec;
+ struct device_node *np = dev->of_node;
+
+ /*
+ * FIXME: we should allocate the DMA channel from this
+ * context and pass the channel down to the ssp users.
+ * For now, we lookup the rx and tx indices manually
+ */
+
+ /* rx */
+ of_parse_phandle_with_args(np, "dmas", "#dma-cells",
+ 0, &dma_spec);
+ ssp->drcmr_rx = dma_spec.args[0];
+ of_node_put(dma_spec.np);
+
+ /* tx */
+ of_parse_phandle_with_args(np, "dmas", "#dma-cells",
+ 1, &dma_spec);
+ ssp->drcmr_tx = dma_spec.args[0];
+ of_node_put(dma_spec.np);
+ } else {
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (res == NULL) {
+ dev_err(dev, "no SSP RX DRCMR defined\n");
+ return -ENODEV;
+ }
+ ssp->drcmr_rx = res->start;
- res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
- if (res == NULL) {
- dev_err(dev, "no SSP TX DRCMR defined\n");
- ret = -ENODEV;
- goto err_free_clk;
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
+ if (res == NULL) {
+ dev_err(dev, "no SSP TX DRCMR defined\n");
+ return -ENODEV;
+ }
+ ssp->drcmr_tx = res->start;
}
- ssp->drcmr_tx = res->start;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
@@ -140,12 +178,24 @@ static int pxa_ssp_probe(struct platform_device *pdev)
goto err_free_io;
}
- /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
- * starts from 0, do a translation here
- */
- ssp->port_id = pdev->id + 1;
+ if (dev->of_node) {
+ const struct of_device_id *id =
+ of_match_device(of_match_ptr(pxa_ssp_of_ids), dev);
+ ssp->type = (int) id->data;
+ /* REVISIT: we want to pass real of_nodes eventually */
+ ssp->port_id = ++ssp_count;
+ } else {
+ const struct platform_device_id *id =
+ platform_get_device_id(pdev);
+ ssp->type = (int) id->driver_data;
+
+ /* PXA2xx/3xx SSP ports starts from 1 and the internal pdev->id
+ * starts from 0, do a translation here
+ */
+ ssp->port_id = pdev->id + 1;
+ }
+
ssp->use_count = 0;
- ssp->type = (int)id->driver_data;
mutex_lock(&ssp_lock);
list_add(&ssp->node, &ssp_list);
@@ -202,8 +252,9 @@ static struct platform_driver pxa_ssp_driver = {
.probe = pxa_ssp_probe,
.remove = pxa_ssp_remove,
.driver = {
- .owner = THIS_MODULE,
- .name = "pxa2xx-ssp",
+ .owner = THIS_MODULE,
+ .name = "pxa2xx-ssp",
+ .of_match_table = of_match_ptr(pxa_ssp_of_ids),
},
.id_table = ssp_id_table,
};
--
1.8.3.1
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