From mboxrd@z Thu Jan 1 00:00:00 1970 From: daniel.thompson@linaro.org (Daniel Thompson) Date: Mon, 01 Jun 2015 08:46:59 +0100 Subject: [PATCH v2 2/4] dt-bindings: Document the STM32F4 clock bindings In-Reply-To: <55698104.2070205@gmail.com> References: <1432327273-6810-1-git-send-email-daniel.thompson@linaro.org> <1432972448-10332-1-git-send-email-daniel.thompson@linaro.org> <1432972448-10332-3-git-send-email-daniel.thompson@linaro.org> <55698104.2070205@gmail.com> Message-ID: <556C0DF3.7050603@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 30/05/15 10:21, Maxime Coquelin wrote: > HI Daniel, > > On 05/30/2015 09:54 AM, Daniel Thompson wrote: >> This adds documentation of device tree bindings for the clock related >> portions of the STM32 RCC block. >> >> Signed-off-by: Daniel Thompson >> --- >> .../devicetree/bindings/clock/st,stm32-rcc.txt | 65 >> ++++++++++++++++++++++ >> 1 file changed, 65 insertions(+) >> >> +Example: >> + >> + /* Gated clock, AHB1 bit 0 (GPIOA) */ >> + ... { >> + clocks = <&rcc 0 0> >> + }; >> + >> + /* Gated clock, AHB2 bit 4 (GPIOA) */ > s/GPIOA/CRYP/ Oops! Will fix. >> + ... { >> + clocks = <&rcc 0 36> >> + }; >> + >> +Specifying other clocks >> +======================= >> + >> +The primary index must be set to 1. >> + >> +The secondary index is bound with the following magic numbers: >> + >> + 0 SYSTICK >> + 1 FCLK > How do you plan to handle the SAI & I2S clocks? > By adding index 3? Pretty much. Tentatively I'm thinking of: 2 I2S clocks 3 SAI1_A clock 4 SAI1_B clock 5 LCD-TFT clock Note: Sort order is based on the vertical ordering in the clock tree diagram in the data sheet. Only reason not to include these in the bindings immediately is that I wanted to check how/if these clocks are gated. The clock tree diagram shows them having individual clock gates so before proposing them using magic numbers I wanted to double check if these values can be identified at gates clocks. Daniel.