linux-kernel - [PATCH 3/8 v2] dma: k3dma: Upgrade k3dma driver to support hisi_asp

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Date:   Fri,  4 Jan 2019 12:56:23 -0800
From:   John Stultz <john.stultz@...aro.org>
To:     lkml <linux-kernel@...r.kernel.org>
Cc:     Youlin Wang <wwx575822@...esmail.huawei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>,
        Zhuangluan Su <suzhuangluan@...ilicon.com>,
        Ryan Grachek <ryan@...ted.us>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        dmaengine@...r.kernel.org, Tanglei Han <hantanglei@...wei.com>,
        John Stultz <john.stultz@...aro.org>
Subject: [PATCH 3/8 v2] dma: k3dma: Upgrade k3dma driver to support hisi_asp_dma hardware

From: Youlin Wang <wwx575822@...esmail.huawei.com>

There is an new "hisi-pcm-asp-dma-1.0" device added in
"arch/arm64/boot/dts/hisilicon/hi3660.dtsi".
So we have to add a matching id in the driver file:
 .compatible = "hisilicon,hisi-pcm-asp-dma-1.0"

And also hisi-pcm-asp dma device needs no setting to the clock.
So we skip this by adding and using soc data flags.

After above this driver will support both k3 and hisi_asp dma hardware.

Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Vinod Koul <vkoul@...nel.org>
Cc: Zhuangluan Su <suzhuangluan@...ilicon.com>
Cc: Ryan Grachek <ryan@...ted.us>
Cc: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: dmaengine@...r.kernel.org
Signed-off-by: Youlin Wang <wwx575822@...esmail.huawei.com>
Signed-off-by: Tanglei Han <hantanglei@...wei.com>
[jstultz: Reworked to use of_match_data]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2:
* Reworked to use of_match_data
---
 drivers/dma/k3dma.c | 37 ++++++++++++++++++++++++++++++++-----
 1 file changed, 32 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c
index fdec2b6..df61406 100644
--- a/drivers/dma/k3dma.c
+++ b/drivers/dma/k3dma.c
@@ -116,6 +116,13 @@ struct k3_dma_dev {
 	unsigned int		irq;
 };
 
+
+#define K3_FLAG_NOCLK  (1<<0)
+struct k3dma_soc_data {
+	unsigned long flags;
+};
+
+
 #define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
 
 static int k3_dma_config_write(struct dma_chan *chan,
@@ -790,8 +797,21 @@ static int k3_dma_transfer_resume(struct dma_chan *chan)
 	return 0;
 }
 
+static const struct k3dma_soc_data k3_v1_dma_data = {
+	.flags = 0,
+};
+
+static const struct k3dma_soc_data asp_v1_dma_data = {
+	.flags = K3_FLAG_NOCLK,
+};
+
 static const struct of_device_id k3_pdma_dt_ids[] = {
-	{ .compatible = "hisilicon,k3-dma-1.0", },
+	{ .compatible = "hisilicon,k3-dma-1.0",
+	  .data = &k3_v1_dma_data
+	},
+	{ .compatible = "hisilicon,hisi-pcm-asp-dma-1.0",
+	  .data = &asp_v1_dma_data
+	},
 	{}
 };
 MODULE_DEVICE_TABLE(of, k3_pdma_dt_ids);
@@ -810,6 +830,7 @@ static struct dma_chan *k3_of_dma_simple_xlate(struct of_phandle_args *dma_spec,
 
 static int k3_dma_probe(struct platform_device *op)
 {
+	const struct k3dma_soc_data *soc_data;
 	struct k3_dma_dev *d;
 	const struct of_device_id *of_id;
 	struct resource *iores;
@@ -823,6 +844,10 @@ static int k3_dma_probe(struct platform_device *op)
 	if (!d)
 		return -ENOMEM;
 
+	soc_data = device_get_match_data(&op->dev);
+	if (!soc_data)
+		return -EINVAL;
+
 	d->base = devm_ioremap_resource(&op->dev, iores);
 	if (IS_ERR(d->base))
 		return PTR_ERR(d->base);
@@ -835,10 +860,12 @@ static int k3_dma_probe(struct platform_device *op)
 				"dma-requests", &d->dma_requests);
 	}
 
-	d->clk = devm_clk_get(&op->dev, NULL);
-	if (IS_ERR(d->clk)) {
-		dev_err(&op->dev, "no dma clk\n");
-		return PTR_ERR(d->clk);
+	if (!(soc_data->flags & K3_FLAG_NOCLK)) {
+		d->clk = devm_clk_get(&op->dev, NULL);
+		if (IS_ERR(d->clk)) {
+			dev_err(&op->dev, "no dma clk\n");
+			return PTR_ERR(d->clk);
+		}
 	}
 
 	irq = platform_get_irq(op, 0);
-- 
2.7.4