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authorSven Van Asbroeck <thesven73@gmail.com>2019-07-12 16:43:15 -0400
committerShawn Guo <shawnguo@kernel.org>2019-08-03 10:18:56 +0200
commit77266e722feabb6eefc8a7e84ac2415837d91c5f (patch)
treef4ee9e8cad0f5ddbc2e40db5f0981f606773f8af /drivers/bus
parentd43dc52274d40a1543ca962008feb9ff784e3a49 (diff)
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')
-rw-r--r--drivers/bus/imx-weim.c16
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)