From: Sven Van Asbroeck <thesven73@gmail.com>
To: Shawn Guo <shawnguo@kernel.org>, Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
devicetree@vger.kernel.org, Kees Cook <keescook@chromium.org>,
Arnd Bergmann <arnd@arndb.de>,
Sascha Hauer <s.hauer@pengutronix.de>,
linux-kernel@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
Pengutronix Kernel Team <kernel@pengutronix.de>,
Fabio Estevam <festevam@gmail.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] bus: imx-weim: optionally enable burst clock mode
Date: Fri, 12 Jul 2019 16:43:15 -0400 [thread overview]
Message-ID: <20190712204316.16783-1-TheSven73@gmail.com> (raw)
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>
---
drivers/bus/imx-weim.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
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)
--
2.17.1
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next reply other threads:[~2019-07-12 20:43 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-12 20:43 Sven Van Asbroeck [this message]
2019-07-12 20:43 ` [PATCH 2/2] dt-bindings: bus: imx-weim: document optional burst clock mode Sven Van Asbroeck
2019-07-24 20:48 ` Rob Herring
2019-07-25 14:30 ` [PATCH 1/2] bus: imx-weim: optionally enable " Sven Van Asbroeck
2019-07-25 19:32 ` Fabio Estevam
2019-08-03 8:19 ` Shawn Guo
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