diff options
| author | Sven Van Asbroeck <thesven73@gmail.com> | 2019-07-12 16:43:15 -0400 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2019-08-03 10:18:56 +0200 |
| commit | 77266e722feabb6eefc8a7e84ac2415837d91c5f (patch) | |
| tree | f4ee9e8cad0f5ddbc2e40db5f0981f606773f8af /drivers/bus/imx-weim.c | |
| parent | d43dc52274d40a1543ca962008feb9ff784e3a49 (diff) | |
| download | linux-77266e722feabb6eefc8a7e84ac2415837d91c5f.tar.gz | |
bus: imx-weim: optionally enable burst clock mode
To enable burst clock mode, add the fsl,burst-clk-enable
property to the weim bus's devicetree node.
Example:
weim: weim@21b8000 {
compatible = "fsl,imx6q-weim";
reg = <0x021b8000 0x4000>;
clocks = <&clks 196>;
#address-cells = <2>;
#size-cells = <1>;
ranges = <0 0 0x08000000 0x08000000>;
fsl,weim-cs-gpr = <&gpr>;
fsl,burst-clk-enable;
client-device@0,0 {
compatible = "something";
reg = <0 0 0x02000000>;
#address-cells = <1>;
#size-cells = <1>;
bank-width = <2>;
fsl,weim-cs-timing = <0x00620081 0x00000001 0x1c022000
0x0000c000 0x1404a38e 0x00000000>;
};
};
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
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 | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c index db74334ca5ef..cb7d5504a22a 100644 --- a/drivers/bus/imx-weim.c +++ b/drivers/bus/imx-weim.c @@ -19,6 +19,8 @@ struct imx_weim_devtype { unsigned int cs_count; unsigned int cs_regs_count; unsigned int cs_stride; + unsigned int wcr_offset; + unsigned int wcr_bcm; }; static const struct imx_weim_devtype imx1_weim_devtype = { @@ -37,6 +39,8 @@ static const struct imx_weim_devtype imx50_weim_devtype = { .cs_count = 4, .cs_regs_count = 6, .cs_stride = 0x18, + .wcr_offset = 0x90, + .wcr_bcm = BIT(0), }; static const struct imx_weim_devtype imx51_weim_devtype = { @@ -192,6 +196,7 @@ static int __init weim_parse_dt(struct platform_device *pdev, struct device_node *child; int ret, have_child = 0; struct cs_timing_state ts = {}; + u32 reg; if (devtype == &imx50_weim_devtype) { ret = imx_weim_gpr_setup(pdev); @@ -199,6 +204,17 @@ static int __init weim_parse_dt(struct platform_device *pdev, return ret; } + 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); + } else { + dev_err(&pdev->dev, "burst clk mode not supported.\n"); + return -EINVAL; + } + } + for_each_available_child_of_node(pdev->dev.of_node, child) { ret = weim_timing_setup(&pdev->dev, child, base, devtype, &ts); if (ret) |