diff options
| author | Ivan Bornyakov <i.bornyakov@metrotek.ru> | 2021-12-02 08:57:23 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2021-12-14 10:33:38 +0800 |
| commit | 7b983da38417fa8c36514d6a98997b3cad11b6a9 (patch) | |
| tree | e098bd5b01f231a7f00f38f4e4a52e53f6160409 /drivers/bus/imx-weim.c | |
| parent | 8361b8b29f9389084b679db854cf733375c64763 (diff) | |
| download | linux-7b983da38417fa8c36514d6a98997b3cad11b6a9.tar.bz2 | |
bus: imx-weim: optionally enable continuous burst clock
To enable continuous burst clock, add "fsl,continuous-burst-clk" along
with "fsl,burst-clk-enable" property to the weim bus's devicetree node.
Example:
weim: weim@21b8000 {
compatible = "fsl,imx6ul-weim", "fsl,imx6q-weim";
reg = <0x021b8000 0x4000>;
clocks = <&clks 143>;
#address-cells = <2>;
#size-cells = <1>;
ranges = <0 0 0x50000000 0x08000000>;
fsl,weim-cs-gpr = <&gpr>;
fsl,burst-clk-enable;
fsl,continuous-burst-clk;
client-device@0 {
...
};
};
Signed-off-by: Ivan Bornyakov <i.bornyakov@metrotek.ru>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'drivers/bus/imx-weim.c')
| -rw-r--r-- | drivers/bus/imx-weim.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c index 28bb65a5613f..bccb275b65ba 100644 --- a/drivers/bus/imx-weim.c +++ b/drivers/bus/imx-weim.c @@ -21,6 +21,7 @@ struct imx_weim_devtype { unsigned int cs_stride; unsigned int wcr_offset; unsigned int wcr_bcm; + unsigned int wcr_cont_bclk; }; static const struct imx_weim_devtype imx1_weim_devtype = { @@ -41,6 +42,7 @@ static const struct imx_weim_devtype imx50_weim_devtype = { .cs_stride = 0x18, .wcr_offset = 0x90, .wcr_bcm = BIT(0), + .wcr_cont_bclk = BIT(3), }; static const struct imx_weim_devtype imx51_weim_devtype = { @@ -206,8 +208,20 @@ static int weim_parse_dt(struct platform_device *pdev, void __iomem *base) if (of_property_read_bool(pdev->dev.of_node, "fsl,burst-clk-enable")) { if (devtype->wcr_bcm) { reg = readl(base + devtype->wcr_offset); - writel(reg | devtype->wcr_bcm, - base + devtype->wcr_offset); + reg |= devtype->wcr_bcm; + + if (of_property_read_bool(pdev->dev.of_node, + "fsl,continuous-burst-clk")) { + if (devtype->wcr_cont_bclk) { + reg |= devtype->wcr_cont_bclk; + } else { + dev_err(&pdev->dev, + "continuous burst clk not supported.\n"); + return -EINVAL; + } + } + + writel(reg, base + devtype->wcr_offset); } else { dev_err(&pdev->dev, "burst clk mode not supported.\n"); return -EINVAL; |