From mboxrd@z Thu Jan 1 00:00:00 1970 From: lee.jones@linaro.org (Lee Jones) Date: Tue, 30 Apr 2013 16:41:37 +0100 Subject: [PATCH 5/5] dmaengine: ste_dma40: Fetch disabled channels from DT In-Reply-To: <1367336497-10650-1-git-send-email-lee.jones@linaro.org> References: <1367336497-10650-1-git-send-email-lee.jones@linaro.org> Message-ID: <1367336497-10650-5-git-send-email-lee.jones@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Some platforms have channels which are not available for normal use. This information is currently passed though platform data in internal BSP kernels. Once those platforms land, they'll need to configure them appropriately, so we may as well add the infrastructure. Cc: Vinod Koul Cc: Dan Williams Cc: Per Forlin Cc: Rabin Vincent Signed-off-by: Lee Jones --- Documentation/devicetree/bindings/dma/ste-dma40.txt | 4 ++++ drivers/dma/ste_dma40.c | 16 +++++++++++++++- 2 files changed, 19 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/dma/ste-dma40.txt b/Documentation/devicetree/bindings/dma/ste-dma40.txt index 02e87e7..f234c75 100644 --- a/Documentation/devicetree/bindings/dma/ste-dma40.txt +++ b/Documentation/devicetree/bindings/dma/ste-dma40.txt @@ -12,6 +12,8 @@ Required properties: Optional properties: - dma-channels: Number of channels supported by hardware - if not present the driver will attempt to obtain the information from H/W +- disabled-channels: Channels which can not be used +- disabled-num-chans: Number of channels which can not be used Example: @@ -25,6 +27,8 @@ Example: #dma-cells = <2>; memcpy-channels = <56, 57, 58, 59, 60>; memcpy-num-chans = <5>; + disabled-channels = <12>; + disabled-num-chans = <1>; dma-channels = <8>; }; diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index dbdd67b..b045eb2 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -3464,7 +3464,7 @@ static int __init d40_of_probe(struct platform_device *pdev, struct device_node *np) { struct stedma40_platform_data *pdata; - int num_phy = 0, num_memcpy = 0; + int num_phy = 0, num_memcpy = 0, num_disabled = 0; pdata = devm_kzalloc(&pdev->dev, sizeof(struct stedma40_platform_data), @@ -3493,6 +3493,20 @@ static int __init d40_of_probe(struct platform_device *pdev, pdev->dev.platform_data = pdata; + of_property_read_u32(np, "disabled-num-chans", &num_disabled); + + if (num_disabled > STEDMA40_MAX_PHYS || num_disabled < 0) { + d40_err(&pdev->dev, + "Invalid number of disabled channels specified (%d)\n", + num_disabled); + return -EINVAL; + } + + of_property_read_u32_array(np, "disabled-channels", + pdata->disabled_channels, + num_disabled); + pdata->disabled_channels[num_disabled] = -1; + return 0; } -- 1.7.10.4